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Unified Diff: cc/trees/layer_tree_host_common.cc

Issue 12760011: cc: Chromify LayerTreeHostCommon (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 7 years, 9 months ago
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Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 770a408f7982ef0cf9ac5f55bc443acac955e182..bb4681f117364b053395ace08dad1b6b9bc21a09 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -22,1204 +22,1556 @@
namespace cc {
-ScrollAndScaleSet::ScrollAndScaleSet()
-{
-}
+ScrollAndScaleSet::ScrollAndScaleSet() {}
+
+ScrollAndScaleSet::~ScrollAndScaleSet() {}
-ScrollAndScaleSet::~ScrollAndScaleSet()
-{
+static void SortLayers(std::vector<scoped_refptr<Layer> >::iterator forst,
+ std::vector<scoped_refptr<Layer> >::iterator end,
+ void* layer_sorter) {
+ NOTREACHED();
}
-static void sortLayers(std::vector<scoped_refptr<Layer> >::iterator forst, std::vector<scoped_refptr<Layer> >::iterator end, void* layerSorter)
-{
- NOTREACHED();
+static void SortLayers(std::vector<LayerImpl*>::iterator first,
+ std::vector<LayerImpl*>::iterator end,
+ LayerSorter* layer_sorter) {
+ DCHECK(layer_sorter);
+ TRACE_EVENT0("cc", "layer_tree_host_common::sortLayers");
danakj 2013/03/20 17:27:14 SortLayers
+ layer_sorter->Sort(first, end);
}
-static void sortLayers(std::vector<LayerImpl*>::iterator first, std::vector<LayerImpl*>::iterator end, LayerSorter* layerSorter)
-{
- DCHECK(layerSorter);
- TRACE_EVENT0("cc", "layer_tree_host_common::sortLayers");
- layerSorter->Sort(first, end);
+inline gfx::Rect CalculateVisibleRectWithCachedLayerRect(
+ gfx::Rect target_surface_rect,
+ gfx::Rect layer_bound_rect,
+ gfx::Rect layer_rect_in_target_space,
+ const gfx::Transform& transform) {
+ // Is this layer fully contained within the target surface?
+ if (target_surface_rect.Contains(layer_rect_in_target_space))
+ return layer_bound_rect;
+
+ // If the layer doesn't fill up the entire surface, then find the part of
+ // the surface rect where the layer could be visible. This avoids trying to
+ // project surface rect points that are behind the projection point.
+ gfx::Rect minimal_surface_rect = target_surface_rect;
+ minimal_surface_rect.Intersect(layer_rect_in_target_space);
+
+ // Project the corners of the target surface rect into the layer space.
+ // This bounding rectangle may be larger than it needs to be (being
+ // axis-aligned), but is a reasonable filter on the space to consider.
+ // Non-invertible transforms will create an empty rect here.
+
+ gfx::Transform surface_to_layer(gfx::Transform::kSkipInitialization);
+ if (!transform.GetInverse(&surface_to_layer)) {
+ // TODO(shawnsingh): Either we need to handle uninvertible transforms
+ // here, or DCHECK that the transform is invertible.
+ }
+ gfx::Rect layer_rect = gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(
+ surface_to_layer, gfx::RectF(minimal_surface_rect)));
+ layer_rect.Intersect(layer_bound_rect);
+ return layer_rect;
}
-inline gfx::Rect calculateVisibleRectWithCachedLayerRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const gfx::Rect& layerRectInTargetSpace, const gfx::Transform& transform)
-{
- // Is this layer fully contained within the target surface?
- if (targetSurfaceRect.Contains(layerRectInTargetSpace))
- return layerBoundRect;
-
- // If the layer doesn't fill up the entire surface, then find the part of
- // the surface rect where the layer could be visible. This avoids trying to
- // project surface rect points that are behind the projection point.
- gfx::Rect minimalSurfaceRect = targetSurfaceRect;
- minimalSurfaceRect.Intersect(layerRectInTargetSpace);
-
- // Project the corners of the target surface rect into the layer space.
- // This bounding rectangle may be larger than it needs to be (being
- // axis-aligned), but is a reasonable filter on the space to consider.
- // Non-invertible transforms will create an empty rect here.
-
- gfx::Transform surfaceToLayer(gfx::Transform::kSkipInitialization);
- if (!transform.GetInverse(&surfaceToLayer)) {
- // TODO(shawnsingh): Either we need to handle uninvertible transforms
- // here, or DCHECK that the transform is invertible.
- }
- gfx::Rect layerRect = gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(surfaceToLayer, gfx::RectF(minimalSurfaceRect)));
- layerRect.Intersect(layerBoundRect);
- return layerRect;
+gfx::Rect LayerTreeHostCommon::CalculateVisibleRect(
+ gfx::Rect target_surface_rect,
+ gfx::Rect layer_bound_rect,
+ const gfx::Transform& transform) {
+ gfx::Rect layer_in_surface_space =
+ MathUtil::MapClippedRect(transform, layer_bound_rect);
+ return CalculateVisibleRectWithCachedLayerRect(
+ target_surface_rect, layer_bound_rect, layer_in_surface_space, transform);
}
-gfx::Rect LayerTreeHostCommon::calculateVisibleRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const gfx::Transform& transform)
-{
- gfx::Rect layerInSurfaceSpace = MathUtil::MapClippedRect(transform, layerBoundRect);
- return calculateVisibleRectWithCachedLayerRect(targetSurfaceRect, layerBoundRect, layerInSurfaceSpace, transform);
+template <typename LayerType> static inline bool IsRootLayer(LayerType* layer) {
+ return !layer->parent();
}
template <typename LayerType>
-static inline bool isRootLayer(LayerType* layer)
-{
- return !layer->parent();
+static inline bool LayerIsInExisting3DRenderingContext(LayerType* layer) {
+ // According to current W3C spec on CSS transforms, a layer is part of an
+ // established 3d rendering context if its parent has transform-style of
+ // preserves-3d.
+ return layer->parent() && layer->parent()->preserves_3d();
}
-template<typename LayerType>
-static inline bool layerIsInExisting3DRenderingContext(LayerType* layer)
-{
- // According to current W3C spec on CSS transforms, a layer is part of an established
- // 3d rendering context if its parent has transform-style of preserves-3d.
- return layer->parent() && layer->parent()->preserves_3d();
+template <typename LayerType>
+static bool IsRootLayerOfNewRenderingContext(LayerType* layer) {
+ // According to current W3C spec on CSS transforms (Section 6.1), a layer is
+ // the beginning of 3d rendering context if its parent does not have
+ // transform-style: preserve-3d, but this layer itself does.
+ if (layer->parent())
+ return !layer->parent()->preserves_3d() && layer->preserves_3d();
+
+ return layer->preserves_3d();
}
-template<typename LayerType>
-static bool isRootLayerOfNewRenderingContext(LayerType* layer)
-{
- // According to current W3C spec on CSS transforms (Section 6.1), a layer is the
- // beginning of 3d rendering context if its parent does not have transform-style:
- // preserve-3d, but this layer itself does.
- if (layer->parent())
- return !layer->parent()->preserves_3d() && layer->preserves_3d();
-
- return layer->preserves_3d();
+template <typename LayerType>
+static bool IsLayerBackFaceVisible(LayerType* layer) {
+ // The current W3C spec on CSS transforms says that backface visibility should
+ // be determined differently depending on whether the layer is in a "3d
+ // rendering context" or not. For Chromium code, we can determine whether we
+ // are in a 3d rendering context by checking if the parent preserves 3d.
+
+ if (LayerIsInExisting3DRenderingContext(layer))
+ return layer->draw_transform().IsBackFaceVisible();
+
+ // In this case, either the layer establishes a new 3d rendering context, or
+ // is not in a 3d rendering context at all.
+ return layer->transform().IsBackFaceVisible();
}
-template<typename LayerType>
-static bool isLayerBackFaceVisible(LayerType* layer)
-{
- // The current W3C spec on CSS transforms says that backface visibility should be
- // determined differently depending on whether the layer is in a "3d rendering
- // context" or not. For Chromium code, we can determine whether we are in a 3d
- // rendering context by checking if the parent preserves 3d.
-
- if (layerIsInExisting3DRenderingContext(layer))
- return layer->draw_transform().IsBackFaceVisible();
+template <typename LayerType>
+static bool IsSurfaceBackFaceVisible(LayerType* layer,
+ const gfx::Transform& draw_transform) {
+ if (LayerIsInExisting3DRenderingContext(layer))
+ return draw_transform.IsBackFaceVisible();
- // In this case, either the layer establishes a new 3d rendering context, or is not in
- // a 3d rendering context at all.
+ if (IsRootLayerOfNewRenderingContext(layer))
return layer->transform().IsBackFaceVisible();
-}
-
-template<typename LayerType>
-static bool isSurfaceBackFaceVisible(LayerType* layer, const gfx::Transform& drawTransform)
-{
- if (layerIsInExisting3DRenderingContext(layer))
- return drawTransform.IsBackFaceVisible();
- if (isRootLayerOfNewRenderingContext(layer))
- return layer->transform().IsBackFaceVisible();
-
- // If the renderSurface is not part of a new or existing rendering context, then the
- // layers that contribute to this surface will decide back-face visibility for themselves.
- return false;
+ // If the render_surface is not part of a new or existing rendering context,
+ // then the layers that contribute to this surface will decide back-face
+ // visibility for themselves.
+ return false;
}
-template<typename LayerType>
-static inline bool layerClipsSubtree(LayerType* layer)
-{
- return layer->masks_to_bounds() || layer->mask_layer();
+template <typename LayerType>
+static inline bool LayerClipsSubtree(LayerType* layer) {
+ return layer->masks_to_bounds() || layer->mask_layer();
}
-template<typename LayerType>
-static gfx::Rect calculateVisibleContentRect(LayerType* layer, const gfx::Rect& ancestorClipRectInDescendantSurfaceSpace, const gfx::Rect& layerRectInTargetSpace)
-{
- DCHECK(layer->render_target());
-
- // Nothing is visible if the layer bounds are empty.
- if (!layer->DrawsContent() || layer->content_bounds().IsEmpty() || layer->drawable_content_rect().IsEmpty())
- return gfx::Rect();
-
- // Compute visible bounds in target surface space.
- gfx::Rect visibleRectInTargetSurfaceSpace = layer->drawable_content_rect();
-
- if (!layer->render_target()->render_surface()->clip_rect().IsEmpty()) {
- // In this case the target surface does clip layers that contribute to
- // it. So, we have to convert the current surface's clipRect from its
- // ancestor surface space to the current (descendant) surface
- // space. This conversion is done outside this function so that it can
- // be cached instead of computing it redundantly for every layer.
- visibleRectInTargetSurfaceSpace.Intersect(ancestorClipRectInDescendantSurfaceSpace);
- }
-
- if (visibleRectInTargetSurfaceSpace.IsEmpty())
- return gfx::Rect();
-
- return calculateVisibleRectWithCachedLayerRect(visibleRectInTargetSurfaceSpace, gfx::Rect(gfx::Point(), layer->content_bounds()), layerRectInTargetSpace, layer->draw_transform());
+template <typename LayerType>
+static gfx::Rect CalculateVisibleContentRect(
+ LayerType* layer,
+ gfx::Rect ancestor_clip_rect_in_descendant_surface_space,
+ gfx::Rect layer_rect_in_target_space) {
+ DCHECK(layer->render_target());
+
+ // Nothing is visible if the layer bounds are empty.
+ if (!layer->DrawsContent() || layer->content_bounds().IsEmpty() ||
+ layer->drawable_content_rect().IsEmpty())
+ return gfx::Rect();
+
+ // Compute visible bounds in target surface space.
+ gfx::Rect visible_rect_in_target_surface_space =
+ layer->drawable_content_rect();
+
+ if (!layer->render_target()->render_surface()->clip_rect().IsEmpty()) {
+ // In this case the target surface does clip layers that contribute to
+ // it. So, we have to convert the current surface's clipRect from its
+ // ancestor surface space to the current (descendant) surface
+ // space. This conversion is done outside this function so that it can
+ // be cached instead of computing it redundantly for every layer.
+ visible_rect_in_target_surface_space.Intersect(
+ ancestor_clip_rect_in_descendant_surface_space);
+ }
+
+ if (visible_rect_in_target_surface_space.IsEmpty())
+ return gfx::Rect();
+
+ return CalculateVisibleRectWithCachedLayerRect(
+ visible_rect_in_target_surface_space,
+ gfx::Rect(gfx::Point(), layer->content_bounds()),
+ layer_rect_in_target_space,
+ layer->draw_transform());
}
-static inline bool transformToParentIsKnown(LayerImpl*)
-{
- return true;
-}
+static inline bool TransformToParentIsKnown(LayerImpl*) { return true; }
danakj 2013/03/20 17:27:14 need var name
enne (OOO) 2013/03/20 20:22:08 Done.
-static inline bool transformToParentIsKnown(Layer* layer)
-{
+static inline bool TransformToParentIsKnown(Layer* layer) {
- return !layer->TransformIsAnimating();
+ return !layer->TransformIsAnimating();
}
-static inline bool transformToScreenIsKnown(LayerImpl*)
-{
- return true;
-}
+static inline bool TransformToScreenIsKnown(LayerImpl*) { return true; }
danakj 2013/03/20 17:27:14 var name
enne (OOO) 2013/03/20 20:22:08 Done.
-static inline bool transformToScreenIsKnown(Layer* layer)
-{
- return !layer->screen_space_transform_is_animating();
+static inline bool TransformToScreenIsKnown(Layer* layer) {
+ return !layer->screen_space_transform_is_animating();
}
-template<typename LayerType>
-static bool layerShouldBeSkipped(LayerType* layer)
-{
- // Layers can be skipped if any of these conditions are met.
- // - does not draw content.
- // - is transparent
- // - has empty bounds
- // - the layer is not double-sided, but its back face is visible.
- //
- // Some additional conditions need to be computed at a later point after the recursion is finished.
- // - the intersection of render surface content and layer clipRect is empty
- // - the visibleContentRect is empty
- //
- // Note, if the layer should not have been drawn due to being fully transparent,
- // we would have skipped the entire subtree and never made it into this function,
- // so it is safe to omit this check here.
-
- if (!layer->DrawsContent() || layer->bounds().IsEmpty())
- return true;
-
- LayerType* backfaceTestLayer = layer;
- if (layer->use_parent_backface_visibility()) {
- DCHECK(layer->parent());
- DCHECK(!layer->parent()->use_parent_backface_visibility());
- backfaceTestLayer = layer->parent();
- }
+template <typename LayerType>
+static bool LayerShouldBeSkipped(LayerType* layer) {
+ // Layers can be skipped if any of these conditions are met.
+ // - does not draw content.
+ // - is transparent
+ // - has empty bounds
+ // - the layer is not double-sided, but its back face is visible.
+ //
+ // Some additional conditions need to be computed at a later point after the
+ // recursion is finished.
+ // - the intersection of render surface content and layer clipRect is empty
+ // - the visibleContentRect is empty
+ //
+ // Note, if the layer should not have been drawn due to being fully
+ // transparent, we would have skipped the entire subtree and never made it
+ // into this function, so it is safe to omit this check here.
+
+ if (!layer->DrawsContent() || layer->bounds().IsEmpty())
+ return true;
- // The layer should not be drawn if (1) it is not double-sided and (2) the back of the layer is known to be facing the screen.
- if (!backfaceTestLayer->double_sided() && transformToScreenIsKnown(backfaceTestLayer) && isLayerBackFaceVisible(backfaceTestLayer))
- return true;
+ LayerType* backface_test_layer = layer;
+ if (layer->use_parent_backface_visibility()) {
+ DCHECK(layer->parent());
+ DCHECK(!layer->parent()->use_parent_backface_visibility());
+ backface_test_layer = layer->parent();
+ }
+
+ // The layer should not be drawn if (1) it is not double-sided and (2) the
+ // back of the layer is known to be facing the screen.
+ if (!backface_test_layer->double_sided() &&
+ TransformToScreenIsKnown(backface_test_layer) &&
+ IsLayerBackFaceVisible(backface_test_layer))
+ return true;
- return false;
+ return false;
}
-static inline bool subtreeShouldBeSkipped(LayerImpl* layer)
-{
- // The opacity of a layer always applies to its children (either implicitly
- // via a render surface or explicitly if the parent preserves 3D), so the
- // entire subtree can be skipped if this layer is fully transparent.
- return !layer->opacity();
+static inline bool SubtreeShouldBeSkipped(LayerImpl* layer) {
+ // The opacity of a layer always applies to its children (either implicitly
+ // via a render surface or explicitly if the parent preserves 3D), so the
+ // entire subtree can be skipped if this layer is fully transparent.
+ return !layer->opacity();
}
-static inline bool subtreeShouldBeSkipped(Layer* layer)
-{
- // If the opacity is being animated then the opacity on the main thread is unreliable
- // (since the impl thread may be using a different opacity), so it should not be trusted.
- // In particular, it should not cause the subtree to be skipped.
- // Similarly, for layers that might animate opacity using an impl-only
- // animation, their subtree should also not be skipped.
- return !layer->opacity() && !layer->OpacityIsAnimating() &&
- !layer->OpacityCanAnimateOnImplThread();
+static inline bool SubtreeShouldBeSkipped(Layer* layer) {
+ // If the opacity is being animated then the opacity on the main thread is
+ // unreliable (since the impl thread may be using a different opacity), so it
+ // should not be trusted.
+ // In particular, it should not cause the subtree to be skipped.
+ // Similarly, for layers that might animate opacity using an impl-only
+ // animation, their subtree should also not be skipped.
+ return !layer->opacity() && !layer->OpacityIsAnimating() &&
+ !layer->OpacityCanAnimateOnImplThread();
}
// Called on each layer that could be drawn after all information from
// calcDrawProperties has been updated on that layer. May have some false
// positives (e.g. layers get this called on them but don't actually get drawn).
-static inline void updateTilePrioritiesForLayer(LayerImpl* layer)
-{
- layer->UpdateTilePriorities();
-
- // Mask layers don't get this call, so explicitly update them so they can
- // kick off tile rasterization.
- if (layer->mask_layer())
- layer->mask_layer()->UpdateTilePriorities();
- if (layer->replica_layer() && layer->replica_layer()->mask_layer())
- layer->replica_layer()->mask_layer()->UpdateTilePriorities();
+static inline void UpdateTilePrioritiesForLayer(LayerImpl* layer) {
+ layer->UpdateTilePriorities();
+
+ // Mask layers don't get this call, so explicitly update them so they can
+ // kick off tile rasterization.
+ if (layer->mask_layer())
+ layer->mask_layer()->UpdateTilePriorities();
+ if (layer->replica_layer() && layer->replica_layer()->mask_layer())
+ layer->replica_layer()->mask_layer()->UpdateTilePriorities();
}
-static inline void updateTilePrioritiesForLayer(Layer* layer)
-{
-}
-
-template<typename LayerType>
-static bool subtreeShouldRenderToSeparateSurface(LayerType* layer, bool axisAlignedWithRespectToParent)
-{
- //
- // A layer and its descendants should render onto a new RenderSurfaceImpl if any of these rules hold:
- //
-
- // The root layer should always have a renderSurface.
- if (isRootLayer(layer))
- return true;
-
- // If we force it.
- if (layer->force_render_surface())
- return true;
+static inline void UpdateTilePrioritiesForLayer(Layer* layer) {}
- // If the layer uses a mask.
- if (layer->mask_layer())
- return true;
-
- // If the layer has a reflection.
- if (layer->replica_layer())
- return true;
+template <typename LayerType>
+static bool SubtreeShouldRenderToSeparateSurface(
+ LayerType* layer,
+ bool axis_aligned_with_respect_to_parent) {
+ //
+ // A layer and its descendants should render onto a new RenderSurfaceImpl if
+ // any of these rules hold:
+ //
+
+ // The root layer should always have a render_surface.
+ if (IsRootLayer(layer))
+ return true;
- // If the layer uses a CSS filter.
- if (!layer->filters().isEmpty() || !layer->background_filters().isEmpty() || layer->filter())
- return true;
+ // If we force it.
+ if (layer->force_render_surface())
+ return true;
- int numDescendantsThatDrawContent = layer->draw_properties().num_descendants_that_draw_content;
+ // If the layer uses a mask.
+ if (layer->mask_layer())
+ return true;
- // If the layer flattens its subtree (i.e. the layer doesn't preserve-3d), but it is
- // treated as a 3D object by its parent (i.e. parent does preserve-3d).
- if (layerIsInExisting3DRenderingContext(layer) && !layer->preserves_3d() && numDescendantsThatDrawContent > 0) {
- TRACE_EVENT_INSTANT0("cc", "LayerTreeHostCommon::requireSurface flattening");
- return true;
- }
+ // If the layer has a reflection.
+ if (layer->replica_layer())
+ return true;
- // If the layer clips its descendants but it is not axis-aligned with respect to its parent.
- bool layerClipsExternalContent = layerClipsSubtree(layer) || layer->HasDelegatedContent();
- if (layerClipsExternalContent && !axisAlignedWithRespectToParent && !layer->draw_properties().descendants_can_clip_selves)
- {
- TRACE_EVENT_INSTANT0("cc", "LayerTreeHostCommon::requireSurface clipping");
- return true;
- }
+ // If the layer uses a CSS filter.
+ if (!layer->filters().isEmpty() || !layer->background_filters().isEmpty() ||
+ layer->filter())
+ return true;
- // If the layer has some translucency and does not have a preserves-3d transform style.
- // This condition only needs a render surface if two or more layers in the
- // subtree overlap. But checking layer overlaps is unnecessarily costly so
- // instead we conservatively create a surface whenever at least two layers
- // draw content for this subtree.
- bool atLeastTwoLayersInSubtreeDrawContent = numDescendantsThatDrawContent > 0 && (layer->DrawsContent() || numDescendantsThatDrawContent > 1);
+ int num_descendants_that_draw_content =
+ layer->draw_properties().num_descendants_that_draw_content;
- if (layer->opacity() != 1.f && !layer->preserves_3d() && atLeastTwoLayersInSubtreeDrawContent) {
- TRACE_EVENT_INSTANT0("cc", "LayerTreeHostCommon::requireSurface opacity");
- return true;
- }
+ // If the layer flattens its subtree (i.e. the layer doesn't preserve-3d), but
+ // it is treated as a 3D object by its parent (i.e. parent does preserve-3d).
+ if (LayerIsInExisting3DRenderingContext(layer) && !layer->preserves_3d() &&
+ num_descendants_that_draw_content > 0) {
+ TRACE_EVENT_INSTANT0("cc",
+ "LayerTreeHostCommon::requireSurface flattening");
danakj 2013/03/20 17:27:14 RequireSurface (technically SubtreeShouldRenderToS
enne (OOO) 2013/03/20 20:22:08 Done.
+ return true;
+ }
+
+ // If the layer clips its descendants but it is not axis-aligned with respect
+ // to its parent.
+ bool layer_clips_external_content =
+ LayerClipsSubtree(layer) || layer->HasDelegatedContent();
+ if (layer_clips_external_content && !axis_aligned_with_respect_to_parent &&
+ !layer->draw_properties().descendants_can_clip_selves) {
+ TRACE_EVENT_INSTANT0("cc", "LayerTreeHostCommon::requireSurface clipping");
danakj 2013/03/20 17:27:14 RequireSurface
enne (OOO) 2013/03/20 20:22:08 Done.
enne (OOO) 2013/03/20 20:22:08 Done.
+ return true;
+ }
+
+ // If the layer has some translucency and does not have a preserves-3d
+ // transform style. This condition only needs a render surface if two or more
+ // layers in the subtree overlap. But checking layer overlaps is unnecessarily
+ // costly so instead we conservatively create a surface whenever at least two
+ // layers draw content for this subtree.
+ bool at_least_two_layers_in_subtree_draw_content =
+ num_descendants_that_draw_content > 0 &&
+ (layer->DrawsContent() || num_descendants_that_draw_content > 1);
+
+ if (layer->opacity() != 1.f && !layer->preserves_3d() &&
+ at_least_two_layers_in_subtree_draw_content) {
+ TRACE_EVENT_INSTANT0("cc", "LayerTreeHostCommon::requireSurface opacity");
danakj 2013/03/20 17:27:14 RequireSurface
enne (OOO) 2013/03/20 20:22:08 Done.
+ return true;
+ }
- return false;
+ return false;
}
-gfx::Transform computeScrollCompensationForThisLayer(LayerImpl* scrollingLayer, const gfx::Transform& parentMatrix)
-{
- // For every layer that has non-zero scrollDelta, we have to compute a transform that can undo the
- // scrollDelta translation. In particular, we want this matrix to premultiply a fixed-position layer's
- // parentMatrix, so we design this transform in three steps as follows. The steps described here apply
- // from right-to-left, so Step 1 would be the right-most matrix:
- //
- // Step 1. transform from target surface space to the exact space where scrollDelta is actually applied.
- // -- this is inverse of the matrix in step 3
- // Step 2. undo the scrollDelta
- // -- this is just a translation by scrollDelta.
- // Step 3. transform back to target surface space.
- // -- this transform is the "partialLayerOriginTransform" = (parentMatrix * scale(layer->pageScaleDelta()));
- //
- // These steps create a matrix that both start and end in targetSurfaceSpace. So this matrix can
- // pre-multiply any fixed-position layer's drawTransform to undo the scrollDeltas -- as long as
- // that fixed position layer is fixed onto the same renderTarget as this scrollingLayer.
- //
-
- gfx::Transform partialLayerOriginTransform = parentMatrix;
- partialLayerOriginTransform.PreconcatTransform(scrollingLayer->impl_transform());
-
- gfx::Transform scrollCompensationForThisLayer = partialLayerOriginTransform; // Step 3
- scrollCompensationForThisLayer.Translate(scrollingLayer->scroll_delta().x(), scrollingLayer->scroll_delta().y()); // Step 2
-
- gfx::Transform inversePartialLayerOriginTransform(gfx::Transform::kSkipInitialization);
- if (!partialLayerOriginTransform.GetInverse(&inversePartialLayerOriginTransform)) {
- // TODO(shawnsingh): Either we need to handle uninvertible transforms
- // here, or DCHECK that the transform is invertible.
- }
- scrollCompensationForThisLayer.PreconcatTransform(inversePartialLayerOriginTransform); // Step 1
- return scrollCompensationForThisLayer;
+gfx::Transform ComputeScrollCompensationForThisLayer(
+ LayerImpl* scrolling_layer,
+ const gfx::Transform& parent_matrix) {
+ // For every layer that has non-zero scroll_delta, we have to compute a
+ // transform that can undo the scroll_delta translation. In particular, we
+ // want this matrix to premultiply a fixed-position layer's parent_matrix, so
+ // we design this transform in three steps as follows. The steps described
+ // here apply from right-to-left, so Step 1 would be the right-most matrix:
+ //
+ // Step 1. transform from target surface space to the exact space where
+ // scroll_delta is actually applied.
danakj 2013/03/20 17:27:14 indent this to line up with the --
enne (OOO) 2013/03/20 20:22:08 Done.
+ // -- this is inverse of the matrix in step 3
+ // Step 2. undo the scroll_delta
+ // -- this is just a translation by scroll_delta.
+ // Step 3. transform back to target surface space.
+ // -- this transform is the "partial_layer_origin_transform" =
+ // (parent_matrix * scale(layer->pageScaleDelta()));
+ //
+ // These steps create a matrix that both start and end in targetSurfaceSpace.
+ // So this matrix can pre-multiply any fixed-position layer's draw_transform
+ // to undo the scroll_deltas -- as long as that fixed position layer is fixed
+ // onto the same render_target as this scrolling_layer.
+ //
+
+ gfx::Transform partial_layer_origin_transform = parent_matrix;
+ partial_layer_origin_transform.PreconcatTransform(
+ scrolling_layer->impl_transform());
+
+ gfx::Transform scroll_compensation_for_this_layer =
+ partial_layer_origin_transform; // Step 3
+ scroll_compensation_for_this_layer.Translate(
+ scrolling_layer->scroll_delta().x(),
+ scrolling_layer->scroll_delta().y()); // Step 2
+
+ gfx::Transform inverse_partial_layer_origin_transform(
+ gfx::Transform::kSkipInitialization);
+ if (!partial_layer_origin_transform.GetInverse(
+ &inverse_partial_layer_origin_transform)) {
+ // TODO(shawnsingh): Either we need to handle uninvertible transforms
+ // here, or DCHECK that the transform is invertible.
+ }
+ scroll_compensation_for_this_layer.PreconcatTransform(
+ inverse_partial_layer_origin_transform); // Step 1
+ return scroll_compensation_for_this_layer;
}
-gfx::Transform computeScrollCompensationMatrixForChildren(Layer* current_layer, const gfx::Transform& currentParentMatrix, const gfx::Transform& currentScrollCompensation)
-{
- // The main thread (i.e. Layer) does not need to worry about scroll compensation.
- // So we can just return an identity matrix here.
- return gfx::Transform();
+gfx::Transform ComputeScrollCompensationMatrixForChildren(
+ Layer* current_layer,
+ const gfx::Transform& current_parent_matrix,
+ const gfx::Transform& current_scroll_compensation) {
+ // The main thread (i.e. Layer) does not need to worry about scroll
+ // compensation. So we can just return an identity matrix here.
+ return gfx::Transform();
}
-gfx::Transform computeScrollCompensationMatrixForChildren(LayerImpl* layer, const gfx::Transform& parentMatrix, const gfx::Transform& currentScrollCompensationMatrix)
-{
- // "Total scroll compensation" is the transform needed to cancel out all scrollDelta translations that
- // occurred since the nearest container layer, even if there are renderSurfaces in-between.
- //
- // There are some edge cases to be aware of, that are not explicit in the code:
- // - A layer that is both a fixed-position and container should not be its own container, instead, that means
- // it is fixed to an ancestor, and is a container for any fixed-position descendants.
- // - A layer that is a fixed-position container and has a renderSurface should behave the same as a container
- // without a renderSurface, the renderSurface is irrelevant in that case.
- // - A layer that does not have an explicit container is simply fixed to the viewport.
- // (i.e. the root renderSurface.)
- // - If the fixed-position layer has its own renderSurface, then the renderSurface is
- // the one who gets fixed.
- //
- // This function needs to be called AFTER layers create their own renderSurfaces.
- //
-
- // Avoid the overheads (including stack allocation and matrix initialization/copy) if we know that the scroll compensation doesn't need to be reset or adjusted.
- if (!layer->is_container_for_fixed_position_layers() && layer->scroll_delta().IsZero() && !layer->render_surface())
- return currentScrollCompensationMatrix;
-
- // Start as identity matrix.
- gfx::Transform nextScrollCompensationMatrix;
-
- // If this layer is not a container, then it inherits the existing scroll compensations.
- if (!layer->is_container_for_fixed_position_layers())
- nextScrollCompensationMatrix = currentScrollCompensationMatrix;
-
- // If the current layer has a non-zero scrollDelta, then we should compute its local scrollCompensation
- // and accumulate it to the nextScrollCompensationMatrix.
- if (!layer->scroll_delta().IsZero()) {
- gfx::Transform scrollCompensationForThisLayer = computeScrollCompensationForThisLayer(layer, parentMatrix);
- nextScrollCompensationMatrix.PreconcatTransform(scrollCompensationForThisLayer);
- }
-
- // If the layer created its own renderSurface, we have to adjust nextScrollCompensationMatrix.
- // The adjustment allows us to continue using the scrollCompensation on the next surface.
- // Step 1 (right-most in the math): transform from the new surface to the original ancestor surface
- // Step 2: apply the scroll compensation
- // Step 3: transform back to the new surface.
- if (layer->render_surface() && !nextScrollCompensationMatrix.IsIdentity()) {
- gfx::Transform inverseSurfaceDrawTransform(gfx::Transform::kSkipInitialization);
- if (!layer->render_surface()->draw_transform().GetInverse(&inverseSurfaceDrawTransform)) {
- // TODO(shawnsingh): Either we need to handle uninvertible transforms
- // here, or DCHECK that the transform is invertible.
- }
- nextScrollCompensationMatrix = inverseSurfaceDrawTransform * nextScrollCompensationMatrix * layer->render_surface()->draw_transform();
+gfx::Transform ComputeScrollCompensationMatrixForChildren(
+ LayerImpl* layer,
+ const gfx::Transform& parent_matrix,
+ const gfx::Transform& current_scroll_compensation_matrix) {
+ // "Total scroll compensation" is the transform needed to cancel out all
+ // scroll_delta translations that occurred since the nearest container layer,
+ // even if there are render_surfaces in-between.
+ //
+ // There are some edge cases to be aware of, that are not explicit in the
+ // code:
+ // - A layer that is both a fixed-position and container should not be its
+ // own container, instead, that means it is fixed to an ancestor, and is a
+ // container for any fixed-position descendants.
+ // - A layer that is a fixed-position container and has a render_surface
+ // should behave the same as a container without a render_surface, the
+ // render_surface is irrelevant in that case.
+ // - A layer that does not have an explicit container is simply fixed to the
+ // viewport. (i.e. the root render_surface.)
+ // - If the fixed-position layer has its own render_surface, then the
+ // render_surface is the one who gets fixed.
+ //
+ // This function needs to be called AFTER layers create their own
+ // render_surfaces.
+ //
+
+ // Avoid the overheads (including stack allocation and matrix
+ // initialization/copy) if we know that the scroll compensation doesn't need
+ // to be reset or adjusted.
+ if (!layer->is_container_for_fixed_position_layers() &&
+ layer->scroll_delta().IsZero() && !layer->render_surface())
+ return current_scroll_compensation_matrix;
+
+ // Start as identity matrix.
+ gfx::Transform next_scroll_compensation_matrix;
+
+ // If this layer is not a container, then it inherits the existing scroll
+ // compensations.
+ if (!layer->is_container_for_fixed_position_layers())
+ next_scroll_compensation_matrix = current_scroll_compensation_matrix;
+
+ // If the current layer has a non-zero scroll_delta, then we should compute
+ // its local scrollCompensation and accumulate it to the
+ // next_scroll_compensation_matrix.
+ if (!layer->scroll_delta().IsZero()) {
+ gfx::Transform scroll_compensation_for_this_layer =
+ ComputeScrollCompensationForThisLayer(layer, parent_matrix);
+ next_scroll_compensation_matrix.PreconcatTransform(
+ scroll_compensation_for_this_layer);
+ }
+
+ // If the layer created its own render_surface, we have to adjust
+ // next_scroll_compensation_matrix. The adjustment allows us to continue
+ // using the scrollCompensation on the next surface.
+ // Step 1 (right-most in the math): transform from the new surface to the
+ // original ancestor surface
+ // Step 2: apply the scroll compensation
+ // Step 3: transform back to the new surface.
+ if (layer->render_surface() &&
+ !next_scroll_compensation_matrix.IsIdentity()) {
+ gfx::Transform inverse_surface_draw_transform(
+ gfx::Transform::kSkipInitialization);
+ if (!layer->render_surface()->draw_transform().GetInverse(
+ &inverse_surface_draw_transform)) {
+ // TODO(shawnsingh): Either we need to handle uninvertible transforms
+ // here, or DCHECK that the transform is invertible.
}
+ next_scroll_compensation_matrix =
+ inverse_surface_draw_transform * next_scroll_compensation_matrix *
+ layer->render_surface()->draw_transform();
+ }
- return nextScrollCompensationMatrix;
+ return next_scroll_compensation_matrix;
}
-template<typename LayerType>
-static inline void CalculateContentsScale(LayerType* layer, float contentsScale, bool animating_transform_to_screen)
-{
- layer->CalculateContentsScale(
- contentsScale,
+template <typename LayerType>
+static inline void CalculateContentsScale(LayerType* layer,
+ float contents_scale,
+ bool animating_transform_to_screen) {
+ layer->CalculateContentsScale(contents_scale,
+ animating_transform_to_screen,
+ &layer->draw_properties().contents_scale_x,
+ &layer->draw_properties().contents_scale_y,
+ &layer->draw_properties().content_bounds);
+
+ LayerType* mask_layer = layer->mask_layer();
+ if (mask_layer) {
+ mask_layer->CalculateContentsScale(
+ contents_scale,
animating_transform_to_screen,
- &layer->draw_properties().contents_scale_x,
- &layer->draw_properties().contents_scale_y,
- &layer->draw_properties().content_bounds);
-
- LayerType* maskLayer = layer->mask_layer();
- if (maskLayer)
- {
- maskLayer->CalculateContentsScale(
- contentsScale,
- animating_transform_to_screen,
- &maskLayer->draw_properties().contents_scale_x,
- &maskLayer->draw_properties().contents_scale_y,
- &maskLayer->draw_properties().content_bounds);
- }
-
- LayerType* replicaMaskLayer = layer->replica_layer() ? layer->replica_layer()->mask_layer() : 0;
- if (replicaMaskLayer)
- {
- replicaMaskLayer->CalculateContentsScale(
- contentsScale,
- animating_transform_to_screen,
- &replicaMaskLayer->draw_properties().contents_scale_x,
- &replicaMaskLayer->draw_properties().contents_scale_y,
- &replicaMaskLayer->draw_properties().content_bounds);
- }
+ &mask_layer->draw_properties().contents_scale_x,
+ &mask_layer->draw_properties().contents_scale_y,
+ &mask_layer->draw_properties().content_bounds);
+ }
+
+ LayerType* replica_mask_layer =
+ layer->replica_layer() ? layer->replica_layer()->mask_layer() : 0;
danakj 2013/03/20 17:27:14 NULL
enne (OOO) 2013/03/20 20:22:08 Done.
+ if (replica_mask_layer) {
+ replica_mask_layer->CalculateContentsScale(
+ contents_scale,
+ animating_transform_to_screen,
+ &replica_mask_layer->draw_properties().contents_scale_x,
+ &replica_mask_layer->draw_properties().contents_scale_y,
+ &replica_mask_layer->draw_properties().content_bounds);
+ }
}
-static inline void updateLayerContentsScale(LayerImpl* layer, const gfx::Transform& combinedTransform, float deviceScaleFactor, float pageScaleFactor, bool animating_transform_to_screen)
-{
- gfx::Vector2dF transformScale = MathUtil::ComputeTransform2dScaleComponents(combinedTransform, deviceScaleFactor * pageScaleFactor);
- float contentsScale = std::max(transformScale.x(), transformScale.y());
- CalculateContentsScale(layer, contentsScale, animating_transform_to_screen);
+static inline void UpdateLayerContentsScale(
+ LayerImpl* layer,
+ const gfx::Transform& combined_transform,
+ float device_scale_factor,
+ float page_scale_factor,
+ bool animating_transform_to_screen) {
+ gfx::Vector2dF transform_scale = MathUtil::ComputeTransform2dScaleComponents(
+ combined_transform, device_scale_factor * page_scale_factor);
+ float contents_scale = std::max(transform_scale.x(), transform_scale.y());
+ CalculateContentsScale(layer, contents_scale, animating_transform_to_screen);
}
-static inline void updateLayerContentsScale(Layer* layer, const gfx::Transform& combinedTransform, float deviceScaleFactor, float pageScaleFactor, bool animating_transform_to_screen)
-{
- float rasterScale = layer->raster_scale();
-
- if (layer->automatically_compute_raster_scale()) {
- gfx::Vector2dF transformScale = MathUtil::ComputeTransform2dScaleComponents(combinedTransform, 0.f);
- float combinedScale = std::max(transformScale.x(), transformScale.y());
- float idealRasterScale = combinedScale / deviceScaleFactor;
- if (!layer->bounds_contain_page_scale())
- idealRasterScale /= pageScaleFactor;
-
- bool needToSetRasterScale = !rasterScale;
-
- // If we've previously saved a rasterScale but the ideal changes, things are unpredictable and we should just use 1.
- if (rasterScale && rasterScale != 1.f && idealRasterScale != rasterScale) {
- idealRasterScale = 1.f;
- needToSetRasterScale = true;
- }
-
- if (needToSetRasterScale) {
- bool useAndSaveIdealScale = idealRasterScale >= 1.f && !animating_transform_to_screen;
- if (useAndSaveIdealScale) {
- rasterScale = idealRasterScale;
- layer->SetRasterScale(rasterScale);
- }
- }
- }
-
- if (!rasterScale)
- rasterScale = 1.f;
-
- float contentsScale = rasterScale * deviceScaleFactor;
+static inline void UpdateLayerContentsScale(
+ Layer* layer,
+ const gfx::Transform& combined_transform,
+ float device_scale_factor,
+ float page_scale_factor,
+ bool animating_transform_to_screen) {
+ float raster_scale = layer->raster_scale();
+
+ if (layer->automatically_compute_raster_scale()) {
+ gfx::Vector2dF transform_scale =
+ MathUtil::ComputeTransform2dScaleComponents(combined_transform, 0.f);
+ float combined_scale = std::max(transform_scale.x(), transform_scale.y());
+ float ideal_raster_scale = combined_scale / device_scale_factor;
if (!layer->bounds_contain_page_scale())
- contentsScale *= pageScaleFactor;
+ ideal_raster_scale /= page_scale_factor;
- CalculateContentsScale(layer, contentsScale, animating_transform_to_screen);
-}
+ bool need_to_set_raster_scale = !raster_scale;
-template<typename LayerType, typename LayerList>
-static inline void removeSurfaceForEarlyExit(LayerType* layerToRemove, LayerList& renderSurfaceLayerList)
-{
- DCHECK(layerToRemove->render_surface());
- // Technically, we know that the layer we want to remove should be
- // at the back of the renderSurfaceLayerList. However, we have had
- // bugs before that added unnecessary layers here
- // (https://bugs.webkit.org/show_bug.cgi?id=74147), but that causes
- // things to crash. So here we proactively remove any additional
- // layers from the end of the list.
- while (renderSurfaceLayerList.back() != layerToRemove) {
- renderSurfaceLayerList.back()->ClearRenderSurface();
- renderSurfaceLayerList.pop_back();
+ // If we've previously saved a raster_scale but the ideal changes, things
+ // are unpredictable and we should just use 1.
+ if (raster_scale && raster_scale != 1.f &&
+ ideal_raster_scale != raster_scale) {
+ ideal_raster_scale = 1.f;
+ need_to_set_raster_scale = true;
}
- DCHECK(renderSurfaceLayerList.back() == layerToRemove);
- renderSurfaceLayerList.pop_back();
- layerToRemove->ClearRenderSurface();
-}
-// Recursively walks the layer tree to compute any information that is needed
-// before doing the main recursion.
-template<typename LayerType>
-static void preCalculateMetaInformation(LayerType* layer)
-{
- if (layer->HasDelegatedContent()) {
- // Layers with delegated content need to be treated as if they have as many children as the number
- // of layers they own delegated quads for. Since we don't know this number right now, we choose
- // one that acts like infinity for our purposes.
- layer->draw_properties().num_descendants_that_draw_content = 1000;
- layer->draw_properties().descendants_can_clip_selves = false;
- return;
+ if (need_to_set_raster_scale) {
+ bool use_and_save_ideal_scale =
+ ideal_raster_scale >= 1.f && !animating_transform_to_screen;
+ if (use_and_save_ideal_scale) {
+ raster_scale = ideal_raster_scale;
+ layer->SetRasterScale(raster_scale);
+ }
}
+ }
- int numDescendantsThatDrawContent = 0;
- bool descendantsCanClipSelves = true;
- bool sublayerTransformPreventsClip = !layer->sublayer_transform().IsPositiveScaleOrTranslation();
-
- for (size_t i = 0; i < layer->children().size(); ++i) {
- LayerType* childLayer = layer->children()[i];
- preCalculateMetaInformation<LayerType>(childLayer);
+ if (!raster_scale)
+ raster_scale = 1.f;
- numDescendantsThatDrawContent += childLayer->DrawsContent() ? 1 : 0;
- numDescendantsThatDrawContent += childLayer->draw_properties().num_descendants_that_draw_content;
+ float contents_scale = raster_scale * device_scale_factor;
+ if (!layer->bounds_contain_page_scale())
+ contents_scale *= page_scale_factor;
- if ((childLayer->DrawsContent() && !childLayer->CanClipSelf()) ||
- !childLayer->draw_properties().descendants_can_clip_selves ||
- sublayerTransformPreventsClip ||
- !childLayer->transform().IsPositiveScaleOrTranslation())
- descendantsCanClipSelves = false;
- }
-
- layer->draw_properties().num_descendants_that_draw_content = numDescendantsThatDrawContent;
- layer->draw_properties().descendants_can_clip_selves = descendantsCanClipSelves;
+ CalculateContentsScale(layer, contents_scale, animating_transform_to_screen);
}
-static void roundTranslationComponents(gfx::Transform* transform)
-{
- transform->matrix().setDouble(0, 3, MathUtil::Round(transform->matrix().getDouble(0, 3)));
- transform->matrix().setDouble(1, 3, MathUtil::Round(transform->matrix().getDouble(1, 3)));
+template <typename LayerType, typename LayerList>
+static inline void RemoveSurfaceForEarlyExit(
+ LayerType* layer_to_remove,
+ LayerList& render_surface_layer_list) {
+ DCHECK(layer_to_remove->render_surface());
+ // Technically, we know that the layer we want to remove should be
+ // at the back of the render_surface_layer_list. However, we have had
+ // bugs before that added unnecessary layers here
+ // (https://bugs.webkit.org/show_bug.cgi?id=74147), but that causes
+ // things to crash. So here we proactively remove any additional
+ // layers from the end of the list.
+ while (render_surface_layer_list->back() != layer_to_remove) {
+ render_surface_layer_list->back()->ClearRenderSurface();
+ render_surface_layer_list->pop_back();
+ }
+ DCHECK_EQ(render_surface_layer_list->back(), layer_to_remove);
+ render_surface_layer_list->pop_back();
+ layer_to_remove->ClearRenderSurface();
}
-// Recursively walks the layer tree starting at the given node and computes all the
-// necessary transformations, clipRects, render surfaces, etc.
-template<typename LayerType, typename LayerList, typename RenderSurfaceType>
-static void calculateDrawPropertiesInternal(LayerType* layer, const gfx::Transform& parentMatrix,
- const gfx::Transform& fullHierarchyMatrix, const gfx::Transform& currentScrollCompensationMatrix,
- const gfx::Rect& clipRectFromAncestor, const gfx::Rect& clipRectFromAncestorInDescendantSpace, bool ancestorClipsSubtree,
- RenderSurfaceType* nearestAncestorThatMovesPixels, LayerList& renderSurfaceLayerList, LayerList& layerList,
- LayerSorter* layerSorter, int maxTextureSize, float deviceScaleFactor, float pageScaleFactor, bool subtreeCanUseLCDText,
- gfx::Rect& drawableContentRectOfSubtree, bool updateTilePriorities)
-{
- // This function computes the new matrix transformations recursively for this
- // layer and all its descendants. It also computes the appropriate render surfaces.
- // Some important points to remember:
- //
- // 0. Here, transforms are notated in Matrix x Vector order, and in words we describe what
- // the transform does from left to right.
- //
- // 1. In our terminology, the "layer origin" refers to the top-left corner of a layer, and the
- // positive Y-axis points downwards. This interpretation is valid because the orthographic
- // projection applied at draw time flips the Y axis appropriately.
- //
- // 2. The anchor point, when given as a PointF object, is specified in "unit layer space",
- // where the bounds of the layer map to [0, 1]. However, as a Transform object,
- // the transform to the anchor point is specified in "layer space", where the bounds
- // of the layer map to [bounds.width(), bounds.height()].
- //
- // 3. Definition of various transforms used:
- // M[parent] is the parent matrix, with respect to the nearest render surface, passed down recursively.
- // M[root] is the full hierarchy, with respect to the root, passed down recursively.
- // Tr[origin] is the translation matrix from the parent's origin to this layer's origin.
- // Tr[origin2anchor] is the translation from the layer's origin to its anchor point
- // Tr[origin2center] is the translation from the layer's origin to its center
- // M[layer] is the layer's matrix (applied at the anchor point)
- // M[sublayer] is the layer's sublayer transform (also applied at the layer's anchor point)
- // S[layer2content] is the ratio of a layer's ContentBounds() to its Bounds().
- //
- // Some composite transforms can help in understanding the sequence of transforms:
- // compositeLayerTransform = Tr[origin2anchor] * M[layer] * Tr[origin2anchor].inverse()
- // compositeSublayerTransform = Tr[origin2anchor] * M[sublayer] * Tr[origin2anchor].inverse()
- //
- // 4. When a layer (or render surface) is drawn, it is drawn into a "target render surface". Therefore the draw
- // transform does not necessarily transform from screen space to local layer space. Instead, the draw transform
- // is the transform between the "target render surface space" and local layer space. Note that render surfaces,
- // except for the root, also draw themselves into a different target render surface, and so their draw
- // transform and origin transforms are also described with respect to the target.
- //
- // Using these definitions, then:
- //
- // The draw transform for the layer is:
- // M[draw] = M[parent] * Tr[origin] * compositeLayerTransform * S[layer2content]
- // = M[parent] * Tr[layer->Position() + anchor] * M[layer] * Tr[anchor2origin] * S[layer2content]
- //
- // Interpreting the math left-to-right, this transforms from the layer's render surface to the origin of the layer in content space.
- //
- // The screen space transform is:
- // M[screenspace] = M[root] * Tr[origin] * compositeLayerTransform * S[layer2content]
- // = M[root] * Tr[layer->Position() + anchor] * M[layer] * Tr[anchor2origin] * S[layer2content]
- //
- // Interpreting the math left-to-right, this transforms from the root render surface's content space to the origin of the layer in content space.
- //
- // The transform hierarchy that is passed on to children (i.e. the child's parentMatrix) is:
- // M[parent]_for_child = M[parent] * Tr[origin] * compositeLayerTransform * compositeSublayerTransform
- // = M[parent] * Tr[layer->Position() + anchor] * M[layer] * Tr[anchor2origin] * compositeSublayerTransform
- //
- // and a similar matrix for the full hierarchy with respect to the root.
- //
- // Finally, note that the final matrix used by the shader for the layer is P * M[draw] * S . This final product
- // is computed in drawTexturedQuad(), where:
- // P is the projection matrix
- // S is the scale adjustment (to scale up a canonical quad to the layer's size)
- //
- // When a render surface has a replica layer, that layer's transform is used to draw a second copy of the surface.
- // gfx::Transforms named here are relative to the surface, unless they specify they are relative to the replica layer.
- //
- // We will denote a scale by device scale S[deviceScale]
- //
- // The render surface draw transform to its target surface origin is:
- // M[surfaceDraw] = M[owningLayer->Draw]
- //
- // The render surface origin transform to its the root (screen space) origin is:
- // M[surface2root] = M[owningLayer->screenspace] * S[deviceScale].inverse()
- //
- // The replica draw transform to its target surface origin is:
- // M[replicaDraw] = S[deviceScale] * M[surfaceDraw] * Tr[replica->Position() + replica->anchor()] * Tr[replica] * Tr[origin2anchor].inverse() * S[contentsScale].inverse()
- //
- // The replica draw transform to the root (screen space) origin is:
- // M[replica2root] = M[surface2root] * Tr[replica->Position()] * Tr[replica] * Tr[origin2anchor].inverse()
- //
-
- // If we early-exit anywhere in this function, the drawableContentRect of this subtree should be considered empty.
- drawableContentRectOfSubtree = gfx::Rect();
-
- // The root layer cannot skip calcDrawProperties.
- if (!isRootLayer(layer) && subtreeShouldBeSkipped(layer))
- return;
-
- // As this function proceeds, these are the properties for the current
- // layer that actually get computed. To avoid unnecessary copies
- // (particularly for matrices), we do computations directly on these values
- // when possible.
- DrawProperties<LayerType, RenderSurfaceType>& layerDrawProperties = layer->draw_properties();
-
- gfx::Rect clipRectForSubtree;
- bool subtreeShouldBeClipped = false;
-
- // This value is cached on the stack so that we don't have to inverse-project
- // the surface's clipRect redundantly for every layer. This value is the
- // same as the surface's clipRect, except that instead of being described
- // in the target surface space (i.e. the ancestor surface space), it is
- // described in the current surface space.
- gfx::Rect clipRectForSubtreeInDescendantSpace;
-
- float accumulatedDrawOpacity = layer->opacity();
- bool animatingOpacityToTarget = layer->OpacityIsAnimating();
- bool animatingOpacityToScreen = animatingOpacityToTarget;
- if (layer->parent()) {
- accumulatedDrawOpacity *= layer->parent()->draw_opacity();
- animatingOpacityToTarget |= layer->parent()->draw_opacity_is_animating();
- animatingOpacityToScreen |= layer->parent()->screen_space_opacity_is_animating();
- }
-
- bool animatingTransformToTarget = layer->TransformIsAnimating();
- bool animating_transform_to_screen = animatingTransformToTarget;
- if (layer->parent()) {
- animatingTransformToTarget |= layer->parent()->draw_transform_is_animating();
- animating_transform_to_screen |= layer->parent()->screen_space_transform_is_animating();
- }
-
- gfx::Size bounds = layer->bounds();
- gfx::PointF anchorPoint = layer->anchor_point();
- gfx::PointF position = layer->position() - layer->scroll_delta();
-
- gfx::Transform combinedTransform = parentMatrix;
- if (!layer->transform().IsIdentity()) {
- // LT = Tr[origin] * Tr[origin2anchor]
- combinedTransform.Translate3d(position.x() + anchorPoint.x() * bounds.width(), position.y() + anchorPoint.y() * bounds.height(), layer->anchor_point_z());
- // LT = Tr[origin] * Tr[origin2anchor] * M[layer]
- combinedTransform.PreconcatTransform(layer->transform());
- // LT = Tr[origin] * Tr[origin2anchor] * M[layer] * Tr[anchor2origin]
- combinedTransform.Translate3d(-anchorPoint.x() * bounds.width(), -anchorPoint.y() * bounds.height(), -layer->anchor_point_z());
- } else {
- combinedTransform.Translate(position.x(), position.y());
- }
-
- // The layer's contentsSize is determined from the combinedTransform, which then informs the
- // layer's drawTransform.
- updateLayerContentsScale(layer, combinedTransform, deviceScaleFactor, pageScaleFactor, animating_transform_to_screen);
+// Recursively walks the layer tree to compute any information that is needed
+// before doing the main recursion.
+template <typename LayerType>
+static void PreCalculateMetaInformation(LayerType* layer) {
+ if (layer->HasDelegatedContent()) {
+ // Layers with delegated content need to be treated as if they have as many
+ // children as the number of layers they own delegated quads for. Since we
+ // don't know this number right now, we choose one that acts like infinity
+ // for our purposes.
+ layer->draw_properties().num_descendants_that_draw_content = 1000;
+ layer->draw_properties().descendants_can_clip_selves = false;
+ return;
+ }
+
+ int num_descendants_that_draw_content = 0;
+ bool descendants_can_clip_selves = true;
+ bool sublayer_transform_prevents_clip =
+ !layer->sublayer_transform().IsPositiveScaleOrTranslation();
+
+ for (size_t i = 0; i < layer->children().size(); ++i) {
+ LayerType* child_layer = layer->children()[i];
+ PreCalculateMetaInformation<LayerType>(child_layer);
+
+ num_descendants_that_draw_content += child_layer->DrawsContent() ? 1 : 0;
+ num_descendants_that_draw_content +=
+ child_layer->draw_properties().num_descendants_that_draw_content;
+
+ if ((child_layer->DrawsContent() && !child_layer->CanClipSelf()) ||
+ !child_layer->draw_properties().descendants_can_clip_selves ||
+ sublayer_transform_prevents_clip ||
+ !child_layer->transform().IsPositiveScaleOrTranslation())
+ descendants_can_clip_selves = false;
+ }
+
+ layer->draw_properties().num_descendants_that_draw_content =
+ num_descendants_that_draw_content;
+ layer->draw_properties().descendants_can_clip_selves =
+ descendants_can_clip_selves;
+}
- // If there is a transformation from the impl thread then it should be at
- // the start of the combinedTransform, but we don't want it to affect the
- // computation of contentsScale above.
- // Note carefully: this is Concat, not Preconcat (implTransform * combinedTransform).
- combinedTransform.ConcatTransform(layer->impl_transform());
+static void RoundTranslationComponents(gfx::Transform* transform) {
+ transform->matrix().
+ setDouble(0, 3, MathUtil::Round(transform->matrix().getDouble(0, 3)));
+ transform->matrix().
+ setDouble(1, 3, MathUtil::Round(transform->matrix().getDouble(1, 3)));
+}
- if (!animatingTransformToTarget && layer->scrollable() && combinedTransform.IsScaleOrTranslation()) {
- // Align the scrollable layer's position to screen space pixels to avoid blurriness.
- // To avoid side-effects, do this only if the transform is simple.
- roundTranslationComponents(&combinedTransform);
+// Recursively walks the layer tree starting at the given node and computes all
+// the necessary transformations, clipRects, render surfaces, etc.
+template <typename LayerType, typename LayerList, typename RenderSurfaceType>
+static void CalculateDrawPropertiesInternal(
+ LayerType* layer,
+ const gfx::Transform& parent_matrix,
+ const gfx::Transform& full_hierarchy_matrix,
+ const gfx::Transform& current_scroll_compensation_matrix,
+ gfx::Rect clip_rect_from_ancestor,
+ gfx::Rect clip_rect_from_ancestor_in_descendant_space,
+ bool ancestor_clips_subtree,
+ RenderSurfaceType* nearest_ancestor_that_moves_pixels,
+ LayerList* render_surface_layer_list,
+ LayerList* layer_list,
+ LayerSorter* layer_sorter,
+ int max_texture_size,
+ float device_scale_factor,
+ float page_scale_factor,
+ bool subtree_can_use_lcd_text,
+ gfx::Rect* drawable_content_rect_of_subtree,
+ bool update_tile_priorities) {
+ // This function computes the new matrix transformations recursively for this
+ // layer and all its descendants. It also computes the appropriate render
+ // surfaces.
+ // Some important points to remember:
+ //
+ // 0. Here, transforms are notated in Matrix x Vector order, and in words we
+ // describe what the transform does from left to right.
+ //
+ // 1. In our terminology, the "layer origin" refers to the top-left corner of
+ // a layer, and the positive Y-axis points downwards. This interpretation is
+ // valid because the orthographic projection applied at draw time flips the Y
+ // axis appropriately.
+ //
+ // 2. The anchor point, when given as a PointF object, is specified in "unit
+ // layer space", where the bounds of the layer map to [0, 1]. However, as a
+ // Transform object, the transform to the anchor point is specified in "layer
+ // space", where the bounds of the layer map to [bounds.width(),
+ // bounds.height()].
+ //
+ // 3. Definition of various transforms used:
+ // M[parent] is the parent matrix, with respect to the nearest render
+ // surface, passed down recursively.
+ //
+ // M[root] is the full hierarchy, with respect to the root, passed down
+ // recursively.
+ //
+ // Tr[origin] is the translation matrix from the parent's origin to
+ // this layer's origin.
+ //
+ // Tr[origin2anchor] is the translation from the layer's origin to its
+ // anchor point
+ //
+ // Tr[origin2center] is the translation from the layer's origin to its
+ // center
+ //
+ // M[layer] is the layer's matrix (applied at the anchor point)
+ //
+ // M[sublayer] is the layer's sublayer transform (also applied at the
+ // layer's anchor point)
+ //
+ // S[layer2content] is the ratio of a layer's ContentBounds() to its
+ // Bounds().
+ //
+ // Some composite transforms can help in understanding the sequence of
+ // transforms:
+ // compositeLayerTransform = Tr[origin2anchor] * M[layer] *
+ // Tr[origin2anchor].inverse()
+ //
+ // compositeSublayerTransform = Tr[origin2anchor] * M[sublayer] *
+ // Tr[origin2anchor].inverse()
+ //
+ // 4. When a layer (or render surface) is drawn, it is drawn into a "target
+ // render surface". Therefore the draw transform does not necessarily
+ // transform from screen space to local layer space. Instead, the draw
+ // transform is the transform between the "target render surface space" and
+ // local layer space. Note that render surfaces, except for the root, also
+ // draw themselves into a different target render surface, and so their draw
+ // transform and origin transforms are also described with respect to the
+ // target.
+ //
+ // Using these definitions, then:
+ //
+ // The draw transform for the layer is:
+ // M[draw] = M[parent] * Tr[origin] * compositeLayerTransform *
+ // S[layer2content] = M[parent] * Tr[layer->Position() + anchor] *
+ // M[layer] * Tr[anchor2origin] * S[layer2content]
+ //
+ // Interpreting the math left-to-right, this transforms from the
+ // layer's render surface to the origin of the layer in content space.
+ //
+ // The screen space transform is:
+ // M[screenspace] = M[root] * Tr[origin] * compositeLayerTransform *
+ // S[layer2content]
+ // = M[root] * Tr[layer->Position() + anchor] * M[layer]
+ // * Tr[anchor2origin] * S[layer2content]
+ //
+ // Interpreting the math left-to-right, this transforms from the root
+ // render surface's content space to the origin of the layer in content
+ // space.
+ //
+ // The transform hierarchy that is passed on to children (i.e. the child's
+ // parent_matrix) is:
+ // M[parent]_for_child = M[parent] * Tr[origin] *
+ // compositeLayerTransform * compositeSublayerTransform
+ // = M[parent] * Tr[layer->Position() + anchor] *
+ // M[layer] * Tr[anchor2origin] *
+ // compositeSublayerTransform
+ //
+ // and a similar matrix for the full hierarchy with respect to the
+ // root.
+ //
+ // Finally, note that the final matrix used by the shader for the layer is P *
+ // M[draw] * S . This final product is computed in drawTexturedQuad(), where:
+ // P is the projection matrix
+ // S is the scale adjustment (to scale up a canonical quad to the
+ // layer's size)
+ //
+ // When a render surface has a replica layer, that layer's transform is used
+ // to draw a second copy of the surface. gfx::Transforms named here are
+ // relative to the surface, unless they specify they are relative to the
+ // replica layer.
+ //
+ // We will denote a scale by device scale S[deviceScale]
+ //
+ // The render surface draw transform to its target surface origin is:
+ // M[surfaceDraw] = M[owningLayer->Draw]
+ //
+ // The render surface origin transform to its the root (screen space) origin
+ // is:
+ // M[surface2root] = M[owningLayer->screenspace] *
+ // S[deviceScale].inverse()
+ //
+ // The replica draw transform to its target surface origin is:
+ // M[replicaDraw] = S[deviceScale] * M[surfaceDraw] *
+ // Tr[replica->Position() + replica->anchor()] * Tr[replica] *
+ // Tr[origin2anchor].inverse() * S[contents_scale].inverse()
+ //
+ // The replica draw transform to the root (screen space) origin is:
+ // M[replica2root] = M[surface2root] * Tr[replica->Position()] *
+ // Tr[replica] * Tr[origin2anchor].inverse()
+ //
+
+ // If we early-exit anywhere in this function, the drawableContentRect of this
+ // subtree should be considered empty.
+ *drawable_content_rect_of_subtree = gfx::Rect();
+
+ // The root layer cannot skip calcDrawProperties.
+ if (!IsRootLayer(layer) && SubtreeShouldBeSkipped(layer))
+ return;
+
+ // As this function proceeds, these are the properties for the current
+ // layer that actually get computed. To avoid unnecessary copies
+ // (particularly for matrices), we do computations directly on these values
+ // when possible.
+ DrawProperties<LayerType, RenderSurfaceType>& layer_draw_properties =
+ layer->draw_properties();
+
+ gfx::Rect clip_rect_for_subtree;
+ bool subtree_should_be_clipped = false;
+
+ // This value is cached on the stack so that we don't have to inverse-project
+ // the surface's clipRect redundantly for every layer. This value is the
+ // same as the surface's clipRect, except that instead of being described
+ // in the target surface space (i.e. the ancestor surface space), it is
+ // described in the current surface space.
+ gfx::Rect clip_rect_for_subtree_in_descendant_space;
+
+ float accumulated_draw_opacity = layer->opacity();
+ bool animating_opacity_to_target = layer->OpacityIsAnimating();
+ bool animating_opacity_to_screen = animating_opacity_to_target;
+ if (layer->parent()) {
+ accumulated_draw_opacity *= layer->parent()->draw_opacity();
+ animating_opacity_to_target |= layer->parent()->draw_opacity_is_animating();
+ animating_opacity_to_screen |=
+ layer->parent()->screen_space_opacity_is_animating();
+ }
+
+ bool animating_transform_to_target = layer->TransformIsAnimating();
+ bool animating_transform_to_screen = animating_transform_to_target;
+ if (layer->parent()) {
+ animating_transform_to_target |=
+ layer->parent()->draw_transform_is_animating();
+ animating_transform_to_screen |=
+ layer->parent()->screen_space_transform_is_animating();
+ }
+
+ gfx::Size bounds = layer->bounds();
+ gfx::PointF anchor_point = layer->anchor_point();
+ gfx::PointF position = layer->position() - layer->scroll_delta();
+
+ gfx::Transform combined_transform = parent_matrix;
+ if (!layer->transform().IsIdentity()) {
+ // LT = Tr[origin] * Tr[origin2anchor]
+ combined_transform.Translate3d(
+ position.x() + anchor_point.x() * bounds.width(),
+ position.y() + anchor_point.y() * bounds.height(),
+ layer->anchor_point_z());
+ // LT = Tr[origin] * Tr[origin2anchor] * M[layer]
+ combined_transform.PreconcatTransform(layer->transform());
+ // LT = Tr[origin] * Tr[origin2anchor] * M[layer] * Tr[anchor2origin]
+ combined_transform.Translate3d(-anchor_point.x() * bounds.width(),
+ -anchor_point.y() * bounds.height(),
+ -layer->anchor_point_z());
+ } else {
+ combined_transform.Translate(position.x(), position.y());
+ }
+
+ // The layer's contentsSize is determined from the combined_transform, which
+ // then informs the layer's draw_transform.
+ UpdateLayerContentsScale(layer,
+ combined_transform,
+ device_scale_factor,
+ page_scale_factor,
+ animating_transform_to_screen);
+
+ // If there is a transformation from the impl thread then it should be at
+ // the start of the combined_transform, but we don't want it to affect the
+ // computation of contents_scale above.
+ // Note carefully: this is Concat, not Preconcat (implTransform *
+ // combined_transform).
+ combined_transform.ConcatTransform(layer->impl_transform());
+
+ if (!animating_transform_to_target && layer->scrollable() &&
+ combined_transform.IsScaleOrTranslation()) {
+ // Align the scrollable layer's position to screen space pixels to avoid
+ // blurriness. To avoid side-effects, do this only if the transform is
+ // simple.
+ RoundTranslationComponents(&combined_transform);
+ }
+
+ if (layer->fixed_to_container_layer()) {
+ // Special case: this layer is a composited fixed-position layer; we need to
+ // explicitly compensate for all ancestors' nonzero scroll_deltas to keep
+ // this layer fixed correctly.
+ // Note carefully: this is Concat, not Preconcat
+ // (current_scroll_compensation * combined_transform).
+ combined_transform.ConcatTransform(current_scroll_compensation_matrix);
+ }
+
+ // The draw_transform that gets computed below is effectively the layer's
+ // draw_transform, unless the layer itself creates a render_surface. In that
+ // case, the render_surface re-parents the transforms.
+ layer_draw_properties.target_space_transform = combined_transform;
+ // M[draw] = M[parent] * LT * S[layer2content]
+ layer_draw_properties.target_space_transform.
+ Scale(1.0 / layer->contents_scale_x(), 1.0 / layer->contents_scale_y());
danakj 2013/03/20 17:27:14 .Scale( on the previous line?
enne (OOO) 2013/03/20 20:22:08 Done.
+
+ // layerScreenSpaceTransform represents the transform between root layer's
+ // "screen space" and local content space.
+ layer_draw_properties.screen_space_transform = full_hierarchy_matrix;
+ if (!layer->preserves_3d())
+ layer_draw_properties.screen_space_transform.FlattenTo2d();
+ layer_draw_properties.screen_space_transform.
+ PreconcatTransform(layer_draw_properties.target_space_transform);
danakj 2013/03/20 17:27:14 can PreconcatTransform( go on the prev line?
enne (OOO) 2013/03/20 20:22:08 Done.
enne (OOO) 2013/03/20 20:22:08 Done.
+
+ // Adjusting text AA method during animation may cause repaints, which in-turn
+ // causes jank.
+ bool adjust_text_aa =
+ !animating_opacity_to_screen && !animating_transform_to_screen;
+ // To avoid color fringing, LCD text should only be used on opaque layers with
+ // just integral translation.
+ bool layer_can_use_lcd_text =
+ subtree_can_use_lcd_text && (accumulated_draw_opacity == 1.0) &&
danakj 2013/03/20 17:27:14 1.f
enne (OOO) 2013/03/20 20:22:08 Done.
enne (OOO) 2013/03/20 20:22:08 Done.
+ layer_draw_properties.target_space_transform.
+ IsIdentityOrIntegerTranslation();
+
+ gfx::RectF content_rect(gfx::PointF(), layer->content_bounds());
+
+ // full_hierarchy_matrix is the matrix that transforms objects between screen
+ // space (except projection matrix) and the most recent RenderSurfaceImpl's
+ // space. next_hierarchy_matrix will only change if this layer uses a new
+ // RenderSurfaceImpl, otherwise remains the same.
+ gfx::Transform next_hierarchy_matrix = full_hierarchy_matrix;
+ gfx::Transform sublayer_matrix;
+
+ gfx::Vector2dF render_surface_sublayer_scale =
+ MathUtil::ComputeTransform2dScaleComponents(
+ combined_transform, device_scale_factor * page_scale_factor);
+
+ if (SubtreeShouldRenderToSeparateSurface(
+ layer, combined_transform.IsScaleOrTranslation())) {
+ // Check back-face visibility before continuing with this surface and its
+ // subtree
+ if (!layer->double_sided() && TransformToParentIsKnown(layer) &&
+ IsSurfaceBackFaceVisible(layer, combined_transform))
+ return;
+
+ if (!layer->render_surface())
+ layer->CreateRenderSurface();
+
+ RenderSurfaceType* render_surface = layer->render_surface();
+ render_surface->ClearLayerLists();
+
+ // The owning layer's draw transform has a scale from content to layer
+ // space which we do not want; so here we use the combined_transform
+ // instead of the draw_transform. However, we do need to add a different
+ // scale factor that accounts for the surface's pixel dimensions.
+ combined_transform.Scale(1 / render_surface_sublayer_scale.x(),
danakj 2013/03/20 17:27:14 1.0
enne (OOO) 2013/03/20 20:22:08 Done.
+ 1 / render_surface_sublayer_scale.y());
danakj 2013/03/20 17:27:14 1.0
enne (OOO) 2013/03/20 20:22:08 Done.
+ render_surface->SetDrawTransform(combined_transform);
+
+ // The owning layer's transform was re-parented by the surface, so the
+ // layer's new draw_transform only needs to scale the layer to surface
+ // space.
+ layer_draw_properties.target_space_transform.MakeIdentity();
+ layer_draw_properties.target_space_transform.
+ Scale(render_surface_sublayer_scale.x() / layer->contents_scale_x(),
+ render_surface_sublayer_scale.y() / layer->contents_scale_y());
+
+ // Inside the surface's subtree, we scale everything to the owning layer's
+ // scale. The sublayer matrix transforms layer rects into target surface
+ // content space.
+ DCHECK(sublayer_matrix.IsIdentity());
+ sublayer_matrix.Scale(render_surface_sublayer_scale.x(),
+ render_surface_sublayer_scale.y());
+
+ // The opacity value is moved from the layer to its surface, so that the
+ // entire subtree properly inherits opacity.
+ render_surface->SetDrawOpacity(accumulated_draw_opacity);
+ render_surface->SetDrawOpacityIsAnimating(animating_opacity_to_target);
+ animating_opacity_to_target = false;
+ layer_draw_properties.opacity = 1;
danakj 2013/03/20 17:27:14 1.f
enne (OOO) 2013/03/20 20:22:08 Done.
+ layer_draw_properties.opacity_is_animating = animating_opacity_to_target;
+ layer_draw_properties.screen_space_opacity_is_animating =
+ animating_opacity_to_screen;
+
+ render_surface->SetTargetSurfaceTransformsAreAnimating(
+ animating_transform_to_target);
+ render_surface->SetScreenSpaceTransformsAreAnimating(
+ animating_transform_to_screen);
+ animating_transform_to_target = false;
+ layer_draw_properties.target_space_transform_is_animating =
+ animating_transform_to_target;
+ layer_draw_properties.screen_space_transform_is_animating =
+ animating_transform_to_screen;
+
+ // Update the aggregate hierarchy matrix to include the transform of the
+ // newly created RenderSurfaceImpl.
+ next_hierarchy_matrix.PreconcatTransform(render_surface->draw_transform());
+
+ // The new render_surface here will correctly clip the entire subtree. So,
+ // we do not need to continue propagating the clipping state further down
+ // the tree. This way, we can avoid transforming clipRects from ancestor
+ // target surface space to current target surface space that could cause
+ // more w < 0 headaches.
+ subtree_should_be_clipped = false;
+
+ if (layer->mask_layer()) {
+ DrawProperties<LayerType, RenderSurfaceType>& mask_layer_draw_properties =
+ layer->mask_layer()->draw_properties();
+ mask_layer_draw_properties.render_target = layer;
+ mask_layer_draw_properties.visible_content_rect =
+ gfx::Rect(gfx::Point(), layer->content_bounds());
}
- if (layer->fixed_to_container_layer()) {
- // Special case: this layer is a composited fixed-position layer; we need to
- // explicitly compensate for all ancestors' nonzero scrollDeltas to keep this layer
- // fixed correctly.
- // Note carefully: this is Concat, not Preconcat (currentScrollCompensation * combinedTransform).
- combinedTransform.ConcatTransform(currentScrollCompensationMatrix);
+ if (layer->replica_layer() && layer->replica_layer()->mask_layer()) {
+ DrawProperties<LayerType, RenderSurfaceType>&
+ replica_mask_draw_properties =
+ layer->replica_layer()->mask_layer()->draw_properties();
+ replica_mask_draw_properties.render_target = layer;
+ replica_mask_draw_properties.visible_content_rect =
+ gfx::Rect(gfx::Point(), layer->content_bounds());
}
- // The drawTransform that gets computed below is effectively the layer's drawTransform, unless
- // the layer itself creates a renderSurface. In that case, the renderSurface re-parents the transforms.
- layerDrawProperties.target_space_transform = combinedTransform;
- // M[draw] = M[parent] * LT * S[layer2content]
- layerDrawProperties.target_space_transform.Scale(1.0 / layer->contents_scale_x(), 1.0 / layer->contents_scale_y());
-
- // layerScreenSpaceTransform represents the transform between root layer's "screen space" and local content space.
- layerDrawProperties.screen_space_transform = fullHierarchyMatrix;
- if (!layer->preserves_3d())
- layerDrawProperties.screen_space_transform.FlattenTo2d();
- layerDrawProperties.screen_space_transform.PreconcatTransform(layerDrawProperties.target_space_transform);
-
- // Adjusting text AA method during animation may cause repaints, which in-turn causes jank.
- bool adjustTextAA = !animatingOpacityToScreen && !animating_transform_to_screen;
- // To avoid color fringing, LCD text should only be used on opaque layers with just integral translation.
- bool layerCanUseLCDText = subtreeCanUseLCDText &&
- (accumulatedDrawOpacity == 1.0) &&
- layerDrawProperties.target_space_transform.IsIdentityOrIntegerTranslation();
-
- gfx::RectF contentRect(gfx::PointF(), layer->content_bounds());
-
- // fullHierarchyMatrix is the matrix that transforms objects between screen space (except projection matrix) and the most recent RenderSurfaceImpl's space.
- // nextHierarchyMatrix will only change if this layer uses a new RenderSurfaceImpl, otherwise remains the same.
- gfx::Transform nextHierarchyMatrix = fullHierarchyMatrix;
- gfx::Transform sublayerMatrix;
-
- gfx::Vector2dF renderSurfaceSublayerScale = MathUtil::ComputeTransform2dScaleComponents(combinedTransform, deviceScaleFactor * pageScaleFactor);
-
- if (subtreeShouldRenderToSeparateSurface(layer, combinedTransform.IsScaleOrTranslation())) {
- // Check back-face visibility before continuing with this surface and its subtree
- if (!layer->double_sided() && transformToParentIsKnown(layer) && isSurfaceBackFaceVisible(layer, combinedTransform))
- return;
-
- if (!layer->render_surface())
- layer->CreateRenderSurface();
-
- RenderSurfaceType* renderSurface = layer->render_surface();
- renderSurface->ClearLayerLists();
-
- // The owning layer's draw transform has a scale from content to layer
- // space which we do not want; so here we use the combinedTransform
- // instead of the drawTransform. However, we do need to add a different
- // scale factor that accounts for the surface's pixel dimensions.
- combinedTransform.Scale(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
- renderSurface->SetDrawTransform(combinedTransform);
-
- // The owning layer's transform was re-parented by the surface, so the layer's new drawTransform
- // only needs to scale the layer to surface space.
- layerDrawProperties.target_space_transform.MakeIdentity();
- layerDrawProperties.target_space_transform.Scale(renderSurfaceSublayerScale.x() / layer->contents_scale_x(), renderSurfaceSublayerScale.y() / layer->contents_scale_y());
-
- // Inside the surface's subtree, we scale everything to the owning layer's scale.
- // The sublayer matrix transforms layer rects into target
- // surface content space.
- DCHECK(sublayerMatrix.IsIdentity());
- sublayerMatrix.Scale(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
-
- // The opacity value is moved from the layer to its surface, so that the entire subtree properly inherits opacity.
- renderSurface->SetDrawOpacity(accumulatedDrawOpacity);
- renderSurface->SetDrawOpacityIsAnimating(animatingOpacityToTarget);
- animatingOpacityToTarget = false;
- layerDrawProperties.opacity = 1;
- layerDrawProperties.opacity_is_animating = animatingOpacityToTarget;
- layerDrawProperties.screen_space_opacity_is_animating = animatingOpacityToScreen;
-
- renderSurface->SetTargetSurfaceTransformsAreAnimating(animatingTransformToTarget);
- renderSurface->SetScreenSpaceTransformsAreAnimating(animating_transform_to_screen);
- animatingTransformToTarget = false;
- layerDrawProperties.target_space_transform_is_animating = animatingTransformToTarget;
- layerDrawProperties.screen_space_transform_is_animating = animating_transform_to_screen;
-
- // Update the aggregate hierarchy matrix to include the transform of the
- // newly created RenderSurfaceImpl.
- nextHierarchyMatrix.PreconcatTransform(renderSurface->draw_transform());
-
- // The new renderSurface here will correctly clip the entire subtree. So, we do
- // not need to continue propagating the clipping state further down the tree. This
- // way, we can avoid transforming clipRects from ancestor target surface space to
- // current target surface space that could cause more w < 0 headaches.
- subtreeShouldBeClipped = false;
-
- if (layer->mask_layer()) {
- DrawProperties<LayerType, RenderSurfaceType>& maskLayerDrawProperties = layer->mask_layer()->draw_properties();
- maskLayerDrawProperties.render_target = layer;
- maskLayerDrawProperties.visible_content_rect = gfx::Rect(gfx::Point(), layer->content_bounds());
- }
-
- if (layer->replica_layer() && layer->replica_layer()->mask_layer()) {
- DrawProperties<LayerType, RenderSurfaceType>& replicaMaskDrawProperties = layer->replica_layer()->mask_layer()->draw_properties();
- replicaMaskDrawProperties.render_target = layer;
- replicaMaskDrawProperties.visible_content_rect = gfx::Rect(gfx::Point(), layer->content_bounds());
- }
-
- // FIXME: make this smarter for the SkImageFilter case (check for
- // pixel-moving filters)
- if (layer->filters().hasFilterThatMovesPixels() || layer->filter())
- nearestAncestorThatMovesPixels = renderSurface;
-
- // The render surface clipRect is expressed in the space where this surface draws, i.e. the same space as clipRectFromAncestor.
- renderSurface->SetIsClipped(ancestorClipsSubtree);
- if (ancestorClipsSubtree) {
- renderSurface->SetClipRect(clipRectFromAncestor);
-
- gfx::Transform inverseSurfaceDrawTransform(gfx::Transform::kSkipInitialization);
- if (!renderSurface->draw_transform().GetInverse(&inverseSurfaceDrawTransform)) {
- // TODO(shawnsingh): Either we need to handle uninvertible transforms
- // here, or DCHECK that the transform is invertible.
- }
- clipRectForSubtreeInDescendantSpace = gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(inverseSurfaceDrawTransform, renderSurface->clip_rect()));
- } else {
- renderSurface->SetClipRect(gfx::Rect());
- clipRectForSubtreeInDescendantSpace = clipRectFromAncestorInDescendantSpace;
- }
-
- renderSurface->SetNearestAncestorThatMovesPixels(nearestAncestorThatMovesPixels);
-
- // If the new render surface is drawn translucent or with a non-integral translation
- // then the subtree that gets drawn on this render surface cannot use LCD text.
- subtreeCanUseLCDText = layerCanUseLCDText;
-
- renderSurfaceLayerList.push_back(layer);
+ // FIXME: make this smarter for the SkImageFilter case (check for
danakj 2013/03/20 17:27:14 TODO
enne (OOO) 2013/03/20 20:22:08 Done.
+ // pixel-moving filters)
+ if (layer->filters().hasFilterThatMovesPixels() || layer->filter())
+ nearest_ancestor_that_moves_pixels = render_surface;
+
+ // The render surface clipRect is expressed in the space where this surface
+ // draws, i.e. the same space as clip_rect_from_ancestor.
+ render_surface->SetIsClipped(ancestor_clips_subtree);
+ if (ancestor_clips_subtree) {
+ render_surface->SetClipRect(clip_rect_from_ancestor);
+
+ gfx::Transform inverse_surface_draw_transform(
+ gfx::Transform::kSkipInitialization);
+ if (!render_surface->draw_transform().GetInverse(
+ &inverse_surface_draw_transform)) {
+ // TODO(shawnsingh): Either we need to handle uninvertible transforms
+ // here, or DCHECK that the transform is invertible.
+ }
+ clip_rect_for_subtree_in_descendant_space =
+ gfx::ToEnclosingRect(MathUtil::ProjectClippedRect(
+ inverse_surface_draw_transform, render_surface->clip_rect()));
} else {
- DCHECK(layer->parent());
-
- // Note: layerDrawProperties.target_space_transform is computed above,
- // before this if-else statement.
- layerDrawProperties.target_space_transform_is_animating = animatingTransformToTarget;
- layerDrawProperties.screen_space_transform_is_animating = animating_transform_to_screen;
- layerDrawProperties.opacity = accumulatedDrawOpacity;
- layerDrawProperties.opacity_is_animating = animatingOpacityToTarget;
- layerDrawProperties.screen_space_opacity_is_animating = animatingOpacityToScreen;
- sublayerMatrix = combinedTransform;
-
- layer->ClearRenderSurface();
-
- // Layers without renderSurfaces directly inherit the ancestor's clip status.
- subtreeShouldBeClipped = ancestorClipsSubtree;
- if (ancestorClipsSubtree)
- clipRectForSubtree = clipRectFromAncestor;
-
- // The surface's cached clipRect value propagates regardless of what clipping goes on between layers here.
- clipRectForSubtreeInDescendantSpace = clipRectFromAncestorInDescendantSpace;
-
- // Layers that are not their own renderTarget will render into the target of their nearest ancestor.
- layerDrawProperties.render_target = layer->parent()->render_target();
- }
-
- if (adjustTextAA)
- layerDrawProperties.can_use_lcd_text = layerCanUseLCDText;
-
- gfx::Rect rectInTargetSpace = ToEnclosingRect(MathUtil::MapClippedRect(layer->draw_transform(), contentRect));
-
- if (layerClipsSubtree(layer)) {
- subtreeShouldBeClipped = true;
- if (ancestorClipsSubtree && !layer->render_surface()) {
- clipRectForSubtree = clipRectFromAncestor;
- clipRectForSubtree.Intersect(rectInTargetSpace);
- } else
- clipRectForSubtree = rectInTargetSpace;
+ render_surface->SetClipRect(gfx::Rect());
+ clip_rect_for_subtree_in_descendant_space =
+ clip_rect_from_ancestor_in_descendant_space;
}
- // Flatten to 2D if the layer doesn't preserve 3D.
- if (!layer->preserves_3d())
- sublayerMatrix.FlattenTo2d();
-
- // Apply the sublayer transform at the anchor point of the layer.
- if (!layer->sublayer_transform().IsIdentity()) {
- sublayerMatrix.Translate(layer->anchor_point().x() * bounds.width(), layer->anchor_point().y() * bounds.height());
- sublayerMatrix.PreconcatTransform(layer->sublayer_transform());
- sublayerMatrix.Translate(-layer->anchor_point().x() * bounds.width(), -layer->anchor_point().y() * bounds.height());
+ render_surface->SetNearestAncestorThatMovesPixels(
+ nearest_ancestor_that_moves_pixels);
+
+ // If the new render surface is drawn translucent or with a non-integral
+ // translation then the subtree that gets drawn on this render surface
+ // cannot use LCD text.
+ subtree_can_use_lcd_text = layer_can_use_lcd_text;
+
+ render_surface_layer_list->push_back(layer);
+ } else {
+ DCHECK(layer->parent());
+
+ // Note: layer_draw_properties.target_space_transform is computed above,
+ // before this if-else statement.
+ layer_draw_properties.target_space_transform_is_animating =
+ animating_transform_to_target;
+ layer_draw_properties.screen_space_transform_is_animating =
+ animating_transform_to_screen;
+ layer_draw_properties.opacity = accumulated_draw_opacity;
+ layer_draw_properties.opacity_is_animating = animating_opacity_to_target;
+ layer_draw_properties.screen_space_opacity_is_animating =
+ animating_opacity_to_screen;
+ sublayer_matrix = combined_transform;
+
+ layer->ClearRenderSurface();
+
+ // Layers without render_surfaces directly inherit the ancestor's clip
+ // status.
+ subtree_should_be_clipped = ancestor_clips_subtree;
+ if (ancestor_clips_subtree)
+ clip_rect_for_subtree = clip_rect_from_ancestor;
+
+ // The surface's cached clipRect value propagates regardless of what
+ // clipping goes on between layers here.
+ clip_rect_for_subtree_in_descendant_space =
+ clip_rect_from_ancestor_in_descendant_space;
+
+ // Layers that are not their own render_target will render into the target
+ // of their nearest ancestor.
+ layer_draw_properties.render_target = layer->parent()->render_target();
+ }
+
+ if (adjust_text_aa)
+ layer_draw_properties.can_use_lcd_text = layer_can_use_lcd_text;
+
+ gfx::Rect rect_in_target_space = ToEnclosingRect(
+ MathUtil::MapClippedRect(layer->draw_transform(), content_rect));
+
+ if (LayerClipsSubtree(layer)) {
+ subtree_should_be_clipped = true;
+ if (ancestor_clips_subtree && !layer->render_surface()) {
+ clip_rect_for_subtree = clip_rect_from_ancestor;
+ clip_rect_for_subtree.Intersect(rect_in_target_space);
+ } else
danakj 2013/03/20 17:27:14 {}
enne (OOO) 2013/03/20 20:22:08 Done.
+ clip_rect_for_subtree = rect_in_target_space;
+ }
+
+ // Flatten to 2D if the layer doesn't preserve 3D.
+ if (!layer->preserves_3d())
+ sublayer_matrix.FlattenTo2d();
+
+ // Apply the sublayer transform at the anchor point of the layer.
+ if (!layer->sublayer_transform().IsIdentity()) {
+ sublayer_matrix.Translate(layer->anchor_point().x() * bounds.width(),
+ layer->anchor_point().y() * bounds.height());
+ sublayer_matrix.PreconcatTransform(layer->sublayer_transform());
+ sublayer_matrix.Translate(-layer->anchor_point().x() * bounds.width(),
+ -layer->anchor_point().y() * bounds.height());
+ }
+
+ LayerList& descendants =
+ (layer->render_surface() ? layer->render_surface()->layer_list()
+ : *layer_list);
+
+ // Any layers that are appended after this point are in the layer's subtree
+ // and should be included in the sorting process.
+ size_t sorting_start_index = descendants.size();
+
+ if (!LayerShouldBeSkipped(layer))
+ descendants.push_back(layer);
+
+ gfx::Transform next_scroll_compensation_matrix =
+ ComputeScrollCompensationMatrixForChildren(
+ layer, parent_matrix, current_scroll_compensation_matrix);
+
+ gfx::Rect accumulated_drawable_content_rect_of_children;
+ for (size_t i = 0; i < layer->children().size(); ++i) {
+ LayerType* child =
+ LayerTreeHostCommon::get_child_as_raw_ptr(layer->children(), i);
+ gfx::Rect drawable_content_rect_of_child_subtree;
+ CalculateDrawPropertiesInternal<LayerType, LayerList, RenderSurfaceType>(
+ child,
+ sublayer_matrix,
+ next_hierarchy_matrix,
+ next_scroll_compensation_matrix,
+ clip_rect_for_subtree,
+ clip_rect_for_subtree_in_descendant_space,
+ subtree_should_be_clipped,
+ nearest_ancestor_that_moves_pixels,
+ render_surface_layer_list,
+ &descendants,
+ layer_sorter,
+ max_texture_size,
+ device_scale_factor,
+ page_scale_factor,
+ subtree_can_use_lcd_text,
+ &drawable_content_rect_of_child_subtree,
+ update_tile_priorities);
+ if (!drawable_content_rect_of_child_subtree.IsEmpty()) {
+ accumulated_drawable_content_rect_of_children.Union(
+ drawable_content_rect_of_child_subtree);
+ if (child->render_surface())
+ descendants.push_back(child);
}
-
- LayerList& descendants = (layer->render_surface() ? layer->render_surface()->layer_list() : layerList);
-
- // Any layers that are appended after this point are in the layer's subtree and should be included in the sorting process.
- unsigned sortingStartIndex = descendants.size();
-
- if (!layerShouldBeSkipped(layer))
- descendants.push_back(layer);
-
- gfx::Transform nextScrollCompensationMatrix = computeScrollCompensationMatrixForChildren(layer, parentMatrix, currentScrollCompensationMatrix);;
-
- gfx::Rect accumulatedDrawableContentRectOfChildren;
- for (size_t i = 0; i < layer->children().size(); ++i) {
- LayerType* child = LayerTreeHostCommon::getChildAsRawPtr(layer->children(), i);
- gfx::Rect drawableContentRectOfChildSubtree;
- calculateDrawPropertiesInternal<LayerType, LayerList, RenderSurfaceType>(child, sublayerMatrix, nextHierarchyMatrix, nextScrollCompensationMatrix,
- clipRectForSubtree, clipRectForSubtreeInDescendantSpace, subtreeShouldBeClipped, nearestAncestorThatMovesPixels,
- renderSurfaceLayerList, descendants, layerSorter, maxTextureSize, deviceScaleFactor, pageScaleFactor,
- subtreeCanUseLCDText, drawableContentRectOfChildSubtree, updateTilePriorities);
- if (!drawableContentRectOfChildSubtree.IsEmpty()) {
- accumulatedDrawableContentRectOfChildren.Union(drawableContentRectOfChildSubtree);
- if (child->render_surface())
- descendants.push_back(child);
- }
+ }
+
+ if (layer->render_surface() && !IsRootLayer(layer) &&
+ !layer->render_surface()->layer_list().size()) {
danakj 2013/03/20 17:27:14 !size() -> empty() >_>
enne (OOO) 2013/03/20 20:22:08 Done.
enne (OOO) 2013/03/20 20:22:08 Done.
+ RemoveSurfaceForEarlyExit(layer, render_surface_layer_list);
+ return;
+ }
+
+ // Compute the total drawableContentRect for this subtree (the rect is in
+ // targetSurface space)
danakj 2013/03/20 17:27:14 period
enne (OOO) 2013/03/20 20:22:08 Done.
+ gfx::Rect local_drawable_content_rect_of_subtree =
+ accumulated_drawable_content_rect_of_children;
+ if (layer->DrawsContent())
+ local_drawable_content_rect_of_subtree.Union(rect_in_target_space);
+ if (subtree_should_be_clipped)
+ local_drawable_content_rect_of_subtree.Intersect(clip_rect_for_subtree);
+
+ // Compute the layer's drawable content rect (the rect is in targetSurface
+ // space)
danakj 2013/03/20 17:27:14 period
enne (OOO) 2013/03/20 20:22:08 Done.
+ layer_draw_properties.drawable_content_rect = rect_in_target_space;
+ if (subtree_should_be_clipped) {
+ layer_draw_properties.drawable_content_rect.
+ Intersect(clip_rect_for_subtree);
+ }
+
+ // Tell the layer the rect that is clipped by. In theory we could use a
+ // tighter clipRect here (drawableContentRect), but that actually does not
+ // reduce how much would be drawn, and instead it would create unnecessary
+ // changes to scissor state affecting GPU performance.
+ layer_draw_properties.is_clipped = subtree_should_be_clipped;
+ if (subtree_should_be_clipped) {
+ layer_draw_properties.clip_rect = clip_rect_for_subtree;
+ } else {
+ // Initialize the clipRect to a safe value that will not clip the
+ // layer, just in case clipping is still accidentally used.
+ layer_draw_properties.clip_rect = rect_in_target_space;
+ }
+
+ // Compute the layer's visible content rect (the rect is in content space)
+ layer_draw_properties.visible_content_rect = CalculateVisibleContentRect(
+ layer, clip_rect_for_subtree_in_descendant_space, rect_in_target_space);
+
+ // Compute the remaining properties for the render surface, if the layer has
+ // one.
+ if (IsRootLayer(layer)) {
+ // The root layer's surface's content_rect is always the entire viewport.
+ DCHECK(layer->render_surface());
+ layer->render_surface()->SetContentRect(clip_rect_from_ancestor);
+ } else if (layer->render_surface() && !IsRootLayer(layer)) {
+ RenderSurfaceType* render_surface = layer->render_surface();
+ gfx::Rect clipped_content_rect = local_drawable_content_rect_of_subtree;
+
+ // Don't clip if the layer is reflected as the reflection shouldn't be
+ // clipped. If the layer is animating, then the surface's transform to
+ // its target is not known on the main thread, and we should not use it
+ // to clip.
+ if (!layer->replica_layer() && TransformToParentIsKnown(layer)) {
+ // Note, it is correct to use ancestor_clips_subtree here, because we are
+ // looking at this layer's render_surface, not the layer itself.
+ if (ancestor_clips_subtree && !clipped_content_rect.IsEmpty()) {
+ gfx::Rect surface_clip_rect = LayerTreeHostCommon::CalculateVisibleRect(
+ render_surface->clip_rect(),
+ clipped_content_rect,
+ render_surface->draw_transform());
+ clipped_content_rect.Intersect(surface_clip_rect);
+ }
}
- if (layer->render_surface() && !isRootLayer(layer) && !layer->render_surface()->layer_list().size()) {
- removeSurfaceForEarlyExit(layer, renderSurfaceLayerList);
- return;
- }
-
- // Compute the total drawableContentRect for this subtree (the rect is in targetSurface space)
- gfx::Rect localDrawableContentRectOfSubtree = accumulatedDrawableContentRectOfChildren;
- if (layer->DrawsContent())
- localDrawableContentRectOfSubtree.Union(rectInTargetSpace);
- if (subtreeShouldBeClipped)
- localDrawableContentRectOfSubtree.Intersect(clipRectForSubtree);
-
- // Compute the layer's drawable content rect (the rect is in targetSurface space)
- layerDrawProperties.drawable_content_rect = rectInTargetSpace;
- if (subtreeShouldBeClipped)
- layerDrawProperties.drawable_content_rect.Intersect(clipRectForSubtree);
-
- // Tell the layer the rect that is clipped by. In theory we could use a
- // tighter clipRect here (drawableContentRect), but that actually does not
- // reduce how much would be drawn, and instead it would create unnecessary
- // changes to scissor state affecting GPU performance.
- layerDrawProperties.is_clipped = subtreeShouldBeClipped;
- if (subtreeShouldBeClipped)
- layerDrawProperties.clip_rect = clipRectForSubtree;
- else {
- // Initialize the clipRect to a safe value that will not clip the
- // layer, just in case clipping is still accidentally used.
- layerDrawProperties.clip_rect = rectInTargetSpace;
+ // The RenderSurfaceImpl backing texture cannot exceed the maximum supported
+ // texture size.
+ clipped_content_rect.set_width(
+ std::min(clipped_content_rect.width(), max_texture_size));
+ clipped_content_rect.set_height(
+ std::min(clipped_content_rect.height(), max_texture_size));
+
+ if (clipped_content_rect.IsEmpty()) {
+ render_surface->ClearLayerLists();
+ RemoveSurfaceForEarlyExit(layer, render_surface_layer_list);
+ return;
}
- // Compute the layer's visible content rect (the rect is in content space)
- layerDrawProperties.visible_content_rect = calculateVisibleContentRect(layer, clipRectForSubtreeInDescendantSpace, rectInTargetSpace);
-
- // Compute the remaining properties for the render surface, if the layer has one.
- if (isRootLayer(layer)) {
- // The root layer's surface's contentRect is always the entire viewport.
- DCHECK(layer->render_surface());
- layer->render_surface()->SetContentRect(clipRectFromAncestor);
- } else if (layer->render_surface() && !isRootLayer(layer)) {
- RenderSurfaceType* renderSurface = layer->render_surface();
- gfx::Rect clippedContentRect = localDrawableContentRectOfSubtree;
-
- // Don't clip if the layer is reflected as the reflection shouldn't be
- // clipped. If the layer is animating, then the surface's transform to
- // its target is not known on the main thread, and we should not use it
- // to clip.
- if (!layer->replica_layer() && transformToParentIsKnown(layer)) {
- // Note, it is correct to use ancestorClipsSubtree here, because we are looking at this layer's renderSurface, not the layer itself.
- if (ancestorClipsSubtree && !clippedContentRect.IsEmpty()) {
- gfx::Rect surfaceClipRect = LayerTreeHostCommon::calculateVisibleRect(renderSurface->clip_rect(), clippedContentRect, renderSurface->draw_transform());
- clippedContentRect.Intersect(surfaceClipRect);
- }
- }
-
- // The RenderSurfaceImpl backing texture cannot exceed the maximum supported
- // texture size.
- clippedContentRect.set_width(std::min(clippedContentRect.width(), maxTextureSize));
- clippedContentRect.set_height(std::min(clippedContentRect.height(), maxTextureSize));
-
- if (clippedContentRect.IsEmpty()) {
- renderSurface->ClearLayerLists();
- removeSurfaceForEarlyExit(layer, renderSurfaceLayerList);
- return;
- }
-
- renderSurface->SetContentRect(clippedContentRect);
-
- // The owning layer's screenSpaceTransform has a scale from content to layer space which we need to undo and
- // replace with a scale from the surface's subtree into layer space.
- gfx::Transform screenSpaceTransform = layer->screen_space_transform();
- screenSpaceTransform.Scale(layer->contents_scale_x() / renderSurfaceSublayerScale.x(), layer->contents_scale_y() / renderSurfaceSublayerScale.y());
- renderSurface->SetScreenSpaceTransform(screenSpaceTransform);
-
- if (layer->replica_layer()) {
- gfx::Transform surfaceOriginToReplicaOriginTransform;
- surfaceOriginToReplicaOriginTransform.Scale(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
- surfaceOriginToReplicaOriginTransform.Translate(layer->replica_layer()->position().x() + layer->replica_layer()->anchor_point().x() * bounds.width(),
- layer->replica_layer()->position().y() + layer->replica_layer()->anchor_point().y() * bounds.height());
- surfaceOriginToReplicaOriginTransform.PreconcatTransform(layer->replica_layer()->transform());
- surfaceOriginToReplicaOriginTransform.Translate(-layer->replica_layer()->anchor_point().x() * bounds.width(), -layer->replica_layer()->anchor_point().y() * bounds.height());
- surfaceOriginToReplicaOriginTransform.Scale(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
-
- // Compute the replica's "originTransform" that maps from the replica's origin space to the target surface origin space.
- gfx::Transform replicaOriginTransform = layer->render_surface()->draw_transform() * surfaceOriginToReplicaOriginTransform;
- renderSurface->SetReplicaDrawTransform(replicaOriginTransform);
-
- // Compute the replica's "screenSpaceTransform" that maps from the replica's origin space to the screen's origin space.
- gfx::Transform replicaScreenSpaceTransform = layer->render_surface()->screen_space_transform() * surfaceOriginToReplicaOriginTransform;
- renderSurface->SetReplicaScreenSpaceTransform(replicaScreenSpaceTransform);
- }
+ render_surface->SetContentRect(clipped_content_rect);
+
+ // The owning layer's screen_space_transform has a scale from content to
+ // layer space which we need to undo and replace with a scale from the
+ // surface's subtree into layer space.
+ gfx::Transform screen_space_transform = layer->screen_space_transform();
+ screen_space_transform.Scale(
+ layer->contents_scale_x() / render_surface_sublayer_scale.x(),
+ layer->contents_scale_y() / render_surface_sublayer_scale.y());
+ render_surface->SetScreenSpaceTransform(screen_space_transform);
+
+ if (layer->replica_layer()) {
+ gfx::Transform surface_origin_to_replica_origin_transform;
+ surface_origin_to_replica_origin_transform.Scale(
+ render_surface_sublayer_scale.x(), render_surface_sublayer_scale.y());
+ surface_origin_to_replica_origin_transform.Translate(
+ layer->replica_layer()->position().x() +
+ layer->replica_layer()->anchor_point().x() * bounds.width(),
+ layer->replica_layer()->position().y() +
+ layer->replica_layer()->anchor_point().y() * bounds.height());
+ surface_origin_to_replica_origin_transform.PreconcatTransform(
+ layer->replica_layer()->transform());
+ surface_origin_to_replica_origin_transform.Translate(
+ -layer->replica_layer()->anchor_point().x() * bounds.width(),
+ -layer->replica_layer()->anchor_point().y() * bounds.height());
+ surface_origin_to_replica_origin_transform.Scale(
+ 1 / render_surface_sublayer_scale.x(),
danakj 2013/03/20 17:27:14 1.0
enne (OOO) 2013/03/20 20:22:08 Done.
+ 1 / render_surface_sublayer_scale.y());
danakj 2013/03/20 17:27:14 1.0
enne (OOO) 2013/03/20 20:22:08 Done.
+
+ // Compute the replica's "originTransform" that maps from the replica's
+ // origin space to the target surface origin space.
+ gfx::Transform replica_origin_transform =
+ layer->render_surface()->draw_transform() *
+ surface_origin_to_replica_origin_transform;
+ render_surface->SetReplicaDrawTransform(replica_origin_transform);
+
+ // Compute the replica's "screen_space_transform" that maps from the
+ // replica's origin space to the screen's origin space.
+ gfx::Transform replica_screen_space_transform =
+ layer->render_surface()->screen_space_transform() *
+ surface_origin_to_replica_origin_transform;
+ render_surface->SetReplicaScreenSpaceTransform(
+ replica_screen_space_transform);
}
-
- if (updateTilePriorities)
- updateTilePrioritiesForLayer(layer);
-
- // If neither this layer nor any of its children were added, early out.
- if (sortingStartIndex == descendants.size())
- return;
-
- // If preserves-3d then sort all the descendants in 3D so that they can be
- // drawn from back to front. If the preserves-3d property is also set on the parent then
- // skip the sorting as the parent will sort all the descendants anyway.
- if (layerSorter && descendants.size() && layer->preserves_3d() && (!layer->parent() || !layer->parent()->preserves_3d()))
- sortLayers(descendants.begin() + sortingStartIndex, descendants.end(), layerSorter);
-
- if (layer->render_surface())
- drawableContentRectOfSubtree = gfx::ToEnclosingRect(layer->render_surface()->DrawableContentRect());
- else
- drawableContentRectOfSubtree = localDrawableContentRectOfSubtree;
-
- if (layer->HasContributingDelegatedRenderPasses())
- layer->render_target()->render_surface()->AddContributingDelegatedRenderPassLayer(layer);
+ }
+
+ if (update_tile_priorities)
+ UpdateTilePrioritiesForLayer(layer);
+
+ // If neither this layer nor any of its children were added, early out.
+ if (sorting_start_index == descendants.size())
+ return;
+
+ // If preserves-3d then sort all the descendants in 3D so that they can be
+ // drawn from back to front. If the preserves-3d property is also set on the
+ // parent then skip the sorting as the parent will sort all the descendants
+ // anyway.
+ if (layer_sorter && descendants.size() && layer->preserves_3d() &&
+ (!layer->parent() || !layer->parent()->preserves_3d())) {
+ SortLayers(descendants.begin() + sorting_start_index,
+ descendants.end(),
+ layer_sorter);
+ }
+
+ if (layer->render_surface()) {
+ *drawable_content_rect_of_subtree =
+ gfx::ToEnclosingRect(layer->render_surface()->DrawableContentRect());
+ } else {
+ *drawable_content_rect_of_subtree = local_drawable_content_rect_of_subtree;
+ }
+
+ if (layer->HasContributingDelegatedRenderPasses()) {
+ layer->render_target()->render_surface()->
+ AddContributingDelegatedRenderPassLayer(layer);
+ }
}
-void LayerTreeHostCommon::calculateDrawProperties(Layer* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<scoped_refptr<Layer> >& renderSurfaceLayerList)
-{
- gfx::Rect totalDrawableContentRect;
- gfx::Transform identityMatrix;
- gfx::Transform deviceScaleTransform;
- deviceScaleTransform.Scale(deviceScaleFactor, deviceScaleFactor);
- std::vector<scoped_refptr<Layer> > dummyLayerList;
-
- // The root layer's renderSurface should receive the deviceViewport as the initial clipRect.
- bool subtreeShouldBeClipped = true;
- gfx::Rect deviceViewportRect(gfx::Point(), deviceViewportSize);
- bool updateTilePriorities = false;
-
- // This function should have received a root layer.
- DCHECK(isRootLayer(rootLayer));
-
- preCalculateMetaInformation<Layer>(rootLayer);
- calculateDrawPropertiesInternal<Layer, std::vector<scoped_refptr<Layer> >, RenderSurface>(
- rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,
- deviceViewportRect, deviceViewportRect, subtreeShouldBeClipped, 0, renderSurfaceLayerList,
- dummyLayerList, 0, maxTextureSize,
- deviceScaleFactor, pageScaleFactor, canUseLCDText, totalDrawableContentRect,
- updateTilePriorities);
-
- // The dummy layer list should not have been used.
- DCHECK(dummyLayerList.size() == 0);
- // A root layer renderSurface should always exist after calculateDrawProperties.
- DCHECK(rootLayer->render_surface());
+void LayerTreeHostCommon::CalculateDrawProperties(
+ Layer* root_layer,
+ gfx::Size device_viewport_size,
+ float device_scale_factor,
+ float page_scale_factor,
+ int max_texture_size,
+ bool can_use_lcd_text,
+ std::vector<scoped_refptr<Layer> >* render_surface_layer_list) {
+ gfx::Rect total_drawable_content_rect;
+ gfx::Transform identity_matrix;
+ gfx::Transform device_scale_transform;
+ device_scale_transform.Scale(device_scale_factor, device_scale_factor);
+ std::vector<scoped_refptr<Layer> > dummy_layer_list;
+
+ // The root layer's render_surface should receive the deviceViewport as the
+ // initial clipRect.
+ bool subtree_should_be_clipped = true;
+ gfx::Rect device_viewport_rect(gfx::Point(), device_viewport_size);
+ bool update_tile_priorities = false;
+
+ // This function should have received a root layer.
+ DCHECK(IsRootLayer(root_layer));
+
+ PreCalculateMetaInformation<Layer>(root_layer);
+ CalculateDrawPropertiesInternal<Layer,
+ std::vector<scoped_refptr<Layer> >,
+ RenderSurface>(root_layer,
+ device_scale_transform,
+ identity_matrix,
+ identity_matrix,
+ device_viewport_rect,
+ device_viewport_rect,
+ subtree_should_be_clipped,
+ NULL,
+ render_surface_layer_list,
+ &dummy_layer_list,
+ NULL,
+ max_texture_size,
+ device_scale_factor,
+ page_scale_factor,
+ can_use_lcd_text,
+ &total_drawable_content_rect,
+ update_tile_priorities);
+
+ // The dummy layer list should not have been used.
+ DCHECK_EQ(dummy_layer_list.size(), 0);
+ // A root layer render_surface should always exist after
+ // calculateDrawProperties.
+ DCHECK(root_layer->render_surface());
}
-void LayerTreeHostCommon::calculateDrawProperties(LayerImpl* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<LayerImpl*>& renderSurfaceLayerList, bool updateTilePriorities)
-{
- gfx::Rect totalDrawableContentRect;
- gfx::Transform identityMatrix;
- gfx::Transform deviceScaleTransform;
- deviceScaleTransform.Scale(deviceScaleFactor, deviceScaleFactor);
- std::vector<LayerImpl*> dummyLayerList;
- LayerSorter layerSorter;
-
- // The root layer's renderSurface should receive the deviceViewport as the initial clipRect.
- bool subtreeShouldBeClipped = true;
- gfx::Rect deviceViewportRect(gfx::Point(), deviceViewportSize);
-
- // This function should have received a root layer.
- DCHECK(isRootLayer(rootLayer));
-
- preCalculateMetaInformation<LayerImpl>(rootLayer);
- calculateDrawPropertiesInternal<LayerImpl, std::vector<LayerImpl*>, RenderSurfaceImpl>(
- rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,
- deviceViewportRect, deviceViewportRect, subtreeShouldBeClipped, 0, renderSurfaceLayerList,
- dummyLayerList, &layerSorter, maxTextureSize,
- deviceScaleFactor, pageScaleFactor, canUseLCDText, totalDrawableContentRect,
- updateTilePriorities);
-
- // The dummy layer list should not have been used.
- DCHECK(dummyLayerList.size() == 0);
- // A root layer renderSurface should always exist after calculateDrawProperties.
- DCHECK(rootLayer->render_surface());
+void LayerTreeHostCommon::CalculateDrawProperties(
+ LayerImpl* root_layer,
+ gfx::Size device_viewport_size,
+ float device_scale_factor,
+ float page_scale_factor,
+ int max_texture_size,
+ bool can_use_lcd_text,
+ std::vector<LayerImpl*>* render_surface_layer_list,
+ bool update_tile_priorities) {
+ gfx::Rect total_drawable_content_rect;
+ gfx::Transform identity_matrix;
+ gfx::Transform device_scale_transform;
+ device_scale_transform.Scale(device_scale_factor, device_scale_factor);
+ std::vector<LayerImpl*> dummy_layer_list;
+ LayerSorter layer_sorter;
+
+ // The root layer's render_surface should receive the deviceViewport as the
+ // initial clipRect.
+ bool subtree_should_be_clipped = true;
+ gfx::Rect device_viewport_rect(gfx::Point(), device_viewport_size);
+
+ // This function should have received a root layer.
+ DCHECK(IsRootLayer(root_layer));
+
+ PreCalculateMetaInformation<LayerImpl>(root_layer);
+ CalculateDrawPropertiesInternal<LayerImpl,
+ std::vector<LayerImpl*>,
+ RenderSurfaceImpl>(
+ root_layer,
+ device_scale_transform,
+ identity_matrix,
+ identity_matrix,
+ device_viewport_rect,
+ device_viewport_rect,
+ subtree_should_be_clipped,
+ NULL,
+ render_surface_layer_list,
+ &dummy_layer_list,
+ &layer_sorter,
+ max_texture_size,
+ device_scale_factor,
+ page_scale_factor,
+ can_use_lcd_text,
+ &total_drawable_content_rect,
+ update_tile_priorities);
+
+ // The dummy layer list should not have been used.
+ DCHECK_EQ(dummy_layer_list.size(), 0);
+ // A root layer render_surface should always exist after
+ // calculateDrawProperties.
+ DCHECK(root_layer->render_surface());
}
-static bool pointHitsRect(const gfx::PointF& screenSpacePoint, const gfx::Transform& localSpaceToScreenSpaceTransform, gfx::RectF localSpaceRect)
-{
- // If the transform is not invertible, then assume that this point doesn't hit this rect.
- gfx::Transform inverseLocalSpaceToScreenSpace(gfx::Transform::kSkipInitialization);
- if (!localSpaceToScreenSpaceTransform.GetInverse(&inverseLocalSpaceToScreenSpace))
- return false;
+static bool PointHitsRect(
+ gfx::PointF screen_space_point,
+ const gfx::Transform& local_space_to_screen_space_transform,
+ gfx::RectF local_space_rect) {
+ // If the transform is not invertible, then assume that this point doesn't hit
+ // this rect.
+ gfx::Transform inverse_local_space_to_screen_space(
+ gfx::Transform::kSkipInitialization);
+ if (!local_space_to_screen_space_transform.GetInverse(
+ &inverse_local_space_to_screen_space))
+ return false;
- // Transform the hit test point from screen space to the local space of the given rect.
- bool clipped = false;
- gfx::PointF hitTestPointInLocalSpace = MathUtil::ProjectPoint(inverseLocalSpaceToScreenSpace, screenSpacePoint, &clipped);
+ // Transform the hit test point from screen space to the local space of the
+ // given rect.
+ bool clipped = false;
+ gfx::PointF hit_test_point_in_local_space = MathUtil::ProjectPoint(
+ inverse_local_space_to_screen_space, screen_space_point, &clipped);
- // If projectPoint could not project to a valid value, then we assume that this point doesn't hit this rect.
- if (clipped)
- return false;
+ // If projectPoint could not project to a valid value, then we assume that
danakj 2013/03/20 17:27:14 ProjectPoint()
enne (OOO) 2013/03/20 20:22:08 Done.
+ // this point doesn't hit this rect.
+ if (clipped)
+ return false;
- return localSpaceRect.Contains(hitTestPointInLocalSpace);
+ return local_space_rect.Contains(hit_test_point_in_local_space);
}
-static bool pointHitsRegion(gfx::PointF screenSpacePoint, const gfx::Transform& screenSpaceTransform, const Region& layerSpaceRegion, float layerContentScaleX, float layerContentScaleY)
-{
- // If the transform is not invertible, then assume that this point doesn't hit this region.
- gfx::Transform inverseScreenSpaceTransform(gfx::Transform::kSkipInitialization);
- if (!screenSpaceTransform.GetInverse(&inverseScreenSpaceTransform))
- return false;
-
- // Transform the hit test point from screen space to the local space of the given region.
- bool clipped = false;
- gfx::PointF hitTestPointInContentSpace = MathUtil::ProjectPoint(inverseScreenSpaceTransform, screenSpacePoint, &clipped);
- gfx::PointF hitTestPointInLayerSpace = gfx::ScalePoint(hitTestPointInContentSpace, 1 / layerContentScaleX, 1 / layerContentScaleY);
+static bool PointHitsRegion(gfx::PointF screen_space_point,
+ const gfx::Transform& screen_space_transform,
+ const Region& layer_space_region,
+ float layer_content_scale_x,
+ float layer_content_scale_y) {
+ // If the transform is not invertible, then assume that this point doesn't hit
+ // this region.
+ gfx::Transform inverse_screen_space_transform(
+ gfx::Transform::kSkipInitialization);
+ if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
+ return false;
- // If projectPoint could not project to a valid value, then we assume that this point doesn't hit this region.
- if (clipped)
- return false;
+ // Transform the hit test point from screen space to the local space of the
+ // given region.
+ bool clipped = false;
+ gfx::PointF hit_test_point_in_content_space = MathUtil::ProjectPoint(
+ inverse_screen_space_transform, screen_space_point, &clipped);
+ gfx::PointF hit_test_point_in_layer_space =
+ gfx::ScalePoint(hit_test_point_in_content_space,
+ 1.f / layer_content_scale_x,
+ 1.f / layer_content_scale_y);
+
+ // If projectPoint could not project to a valid value, then we assume that
danakj 2013/03/20 17:27:14 ProjectPoint()
enne (OOO) 2013/03/20 20:22:08 Done.
+ // this point doesn't hit this region.
+ if (clipped)
+ return false;
- return layerSpaceRegion.Contains(gfx::ToRoundedPoint(hitTestPointInLayerSpace));
+ return layer_space_region.Contains(
+ gfx::ToRoundedPoint(hit_test_point_in_layer_space));
}
-static bool pointIsClippedBySurfaceOrClipRect(const gfx::PointF& screenSpacePoint, LayerImpl* layer)
-{
- LayerImpl* current_layer = layer;
-
- // Walk up the layer tree and hit-test any renderSurfaces and any layer clipRects that are active.
- while (current_layer) {
- if (current_layer->render_surface() && !pointHitsRect(screenSpacePoint, current_layer->render_surface()->screen_space_transform(), current_layer->render_surface()->content_rect()))
- return true;
-
- // Note that drawableContentRects are actually in targetSurface space, so the transform we
- // have to provide is the target surface's screenSpaceTransform.
- LayerImpl* renderTarget = current_layer->render_target();
- if (layerClipsSubtree(current_layer) && !pointHitsRect(screenSpacePoint, renderTarget->render_surface()->screen_space_transform(), current_layer->drawable_content_rect()))
- return true;
-
- current_layer = current_layer->parent();
- }
-
- // If we have finished walking all ancestors without having already exited, then the point is not clipped by any ancestors.
- return false;
+static bool PointIsClippedBySurfaceOrClipRect(gfx::PointF screen_space_point,
+ LayerImpl* layer) {
+ LayerImpl* current_layer = layer;
+
+ // Walk up the layer tree and hit-test any render_surfaces and any layer
+ // clipRects that are active.
danakj 2013/03/20 17:27:14 clip_rects
enne (OOO) 2013/03/20 20:22:08 Done.
+ while (current_layer) {
+ if (current_layer->render_surface() &&
+ !PointHitsRect(
+ screen_space_point,
+ current_layer->render_surface()->screen_space_transform(),
+ current_layer->render_surface()->content_rect()))
+ return true;
+
+ // Note that drawableContentRects are actually in targetSurface space, so
danakj 2013/03/20 17:27:14 drawable_content_rects
danakj 2013/03/20 17:27:14 target_surface
enne (OOO) 2013/03/20 20:22:08 Done.
enne (OOO) 2013/03/20 20:22:08 Done.
+ // the transform we have to provide is the target surface's
+ // screen_space_transform.
+ LayerImpl* render_target = current_layer->render_target();
+ if (LayerClipsSubtree(current_layer) &&
+ !PointHitsRect(
+ screen_space_point,
+ render_target->render_surface()->screen_space_transform(),
+ current_layer->drawable_content_rect()))
+ return true;
+
+ current_layer = current_layer->parent();
+ }
+
+ // If we have finished walking all ancestors without having already exited,
+ // then the point is not clipped by any ancestors.
+ return false;
}
-LayerImpl* LayerTreeHostCommon::findLayerThatIsHitByPoint(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList)
-{
- LayerImpl* foundLayer = 0;
-
- typedef LayerIterator<LayerImpl, std::vector<LayerImpl*>, RenderSurfaceImpl, LayerIteratorActions::FrontToBack> LayerIteratorType;
- LayerIteratorType end = LayerIteratorType::End(&renderSurfaceLayerList);
-
- for (LayerIteratorType it = LayerIteratorType::Begin(&renderSurfaceLayerList); it != end; ++it) {
- // We don't want to consider renderSurfaces for hit testing.
- if (!it.represents_itself())
- continue;
-
- LayerImpl* current_layer = (*it);
-
- gfx::RectF contentRect(gfx::PointF(), current_layer->content_bounds());
- if (!pointHitsRect(screenSpacePoint, current_layer->screen_space_transform(), contentRect))
- continue;
-
- // At this point, we think the point does hit the layer, but we need to walk up
- // the parents to ensure that the layer was not clipped in such a way that the
- // hit point actually should not hit the layer.
- if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, current_layer))
- continue;
-
- // Skip the HUD layer.
- if (current_layer == current_layer->layer_tree_impl()->hud_layer())
- continue;
-
- foundLayer = current_layer;
- break;
- }
-
- // This can potentially return 0, which means the screenSpacePoint did not successfully hit test any layers, not even the root layer.
- return foundLayer;
+LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPoint(
+ gfx::PointF screen_space_point,
+ const std::vector<LayerImpl*>& render_surface_layer_list) {
+ LayerImpl* found_layer = NULL;
+
+ typedef LayerIterator<LayerImpl,
+ std::vector<LayerImpl*>,
+ RenderSurfaceImpl,
+ LayerIteratorActions::FrontToBack> LayerIteratorType;
+ LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
+
+ for (LayerIteratorType
+ it = LayerIteratorType::Begin(&render_surface_layer_list);
+ it != end;
+ ++it) {
+ // We don't want to consider render_surfaces for hit testing.
+ if (!it.represents_itself())
+ continue;
+
+ LayerImpl* current_layer = (*it);
+
+ gfx::RectF content_rect(gfx::PointF(), current_layer->content_bounds());
+ if (!PointHitsRect(screen_space_point,
+ current_layer->screen_space_transform(),
+ content_rect))
+ continue;
+
+ // At this point, we think the point does hit the layer, but we need to walk
+ // up the parents to ensure that the layer was not clipped in such a way
+ // that the hit point actually should not hit the layer.
+ if (PointIsClippedBySurfaceOrClipRect(screen_space_point, current_layer))
+ continue;
+
+ // Skip the HUD layer.
+ if (current_layer == current_layer->layer_tree_impl()->hud_layer())
+ continue;
+
+ found_layer = current_layer;
+ break;
+ }
+
+ // This can potentially return NULL, which means the screen_space_point did
+ // not successfully hit test any layers, not even the root layer.
+ return found_layer;
}
-LayerImpl* LayerTreeHostCommon::findLayerThatIsHitByPointInTouchHandlerRegion(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList)
-{
- LayerImpl* foundLayer = 0;
-
- typedef LayerIterator<LayerImpl, std::vector<LayerImpl*>, RenderSurfaceImpl, LayerIteratorActions::FrontToBack> LayerIteratorType;
- LayerIteratorType end = LayerIteratorType::End(&renderSurfaceLayerList);
-
- for (LayerIteratorType it = LayerIteratorType::Begin(&renderSurfaceLayerList); it != end; ++it) {
- // We don't want to consider renderSurfaces for hit testing.
- if (!it.represents_itself())
- continue;
-
- LayerImpl* current_layer = (*it);
-
- if (!layerHasTouchEventHandlersAt(screenSpacePoint, current_layer))
- continue;
-
- foundLayer = current_layer;
- break;
- }
-
- // This can potentially return 0, which means the screenSpacePoint did not successfully hit test any layers, not even the root layer.
- return foundLayer;
+LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPointInTouchHandlerRegion(
+ gfx::PointF screen_space_point,
+ const std::vector<LayerImpl*>& render_surface_layer_list) {
+ LayerImpl* found_layer = NULL;
+
+ typedef LayerIterator<LayerImpl,
+ std::vector<LayerImpl*>,
+ RenderSurfaceImpl,
+ LayerIteratorActions::FrontToBack> LayerIteratorType;
+ LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
+
+ for (LayerIteratorType
+ it = LayerIteratorType::Begin(&render_surface_layer_list);
+ it != end;
+ ++it) {
+ // We don't want to consider render_surfaces for hit testing.
+ if (!it.represents_itself())
+ continue;
+
+ LayerImpl* current_layer = (*it);
+
+ if (!LayerHasTouchEventHandlersAt(screen_space_point, current_layer))
+ continue;
+
+ found_layer = current_layer;
+ break;
+ }
+
+ // This can potentially return NULL, which means the screen_space_point did
+ // not successfully hit test any layers, not even the root layer.
+ return found_layer;
}
-bool LayerTreeHostCommon::layerHasTouchEventHandlersAt(const gfx::PointF& screenSpacePoint, LayerImpl* layerImpl) {
- if (layerImpl->touch_event_handler_region().IsEmpty())
- return false;
+bool LayerTreeHostCommon::LayerHasTouchEventHandlersAt(
+ gfx::PointF screen_space_point,
+ LayerImpl* layer_impl) {
+ if (layer_impl->touch_event_handler_region().IsEmpty())
+ return false;
- if (!pointHitsRegion(screenSpacePoint, layerImpl->screen_space_transform(), layerImpl->touch_event_handler_region(), layerImpl->contents_scale_x(), layerImpl->contents_scale_y()))
- return false;;
+ if (!PointHitsRegion(screen_space_point,
+ layer_impl->screen_space_transform(),
+ layer_impl->touch_event_handler_region(),
+ layer_impl->contents_scale_x(),
+ layer_impl->contents_scale_y()))
+ return false;
+ ;
danakj 2013/03/20 17:27:14 rm this
enne (OOO) 2013/03/20 20:22:08 Weird. I removed another of these elsewhere but m
- // At this point, we think the point does hit the touch event handler region on the layer, but we need to walk up
- // the parents to ensure that the layer was not clipped in such a way that the
- // hit point actually should not hit the layer.
- if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, layerImpl))
- return false;
+ // At this point, we think the point does hit the touch event handler region
+ // on the layer, but we need to walk up the parents to ensure that the layer
+ // was not clipped in such a way that the hit point actually should not hit
+ // the layer.
+ if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
+ return false;
return true;
}
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