Use nine-patch resource for drawing Aura overlay scrollbar thumb.

cc/layers/nine_patch_layer_impl.cc

Index: cc/layers/nine_patch_layer_impl.cc
diff --git a/cc/layers/nine_patch_layer_impl.cc b/cc/layers/nine_patch_layer_impl.cc
index 436905a448107fb51227645bd46556c6003e4e04..9d409d0ace75b49a5d6d48c3145459d80f50381c 100644
--- a/cc/layers/nine_patch_layer_impl.cc
+++ b/cc/layers/nine_patch_layer_impl.cc
@@ -10,30 +10,13 @@
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/occlusion.h"
+#include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 namespace cc {
 
-// Maximum number of patches that can be produced for one NinePatchLayer.
-static const int kMaxOcclusionPatches = 12;
-static const int kMaxPatches = 9;
-
-namespace {
-
-gfx::Rect ToRect(const gfx::RectF& rect) {
-  return gfx::Rect(rect.x(), rect.y(), rect.width(), rect.height());
-}
-
-}  // namespace
-
-NinePatchLayerImpl::Patch::Patch(const gfx::RectF& image_rect,
-                                 const gfx::RectF& layer_rect)
-    : image_rect(image_rect), layer_rect(layer_rect) {}
-
 NinePatchLayerImpl::NinePatchLayerImpl(LayerTreeImpl* tree_impl, int id)
-    : UIResourceLayerImpl(tree_impl, id),
-      fill_center_(false),
-      nearest_neighbor_(false) {}
+    : UIResourceLayerImpl(tree_impl, id) {}
 
 NinePatchLayerImpl::~NinePatchLayerImpl() {}
 
@@ -46,19 +29,7 @@ void NinePatchLayerImpl::PushPropertiesTo(LayerImpl* layer) {
   UIResourceLayerImpl::PushPropertiesTo(layer);
   NinePatchLayerImpl* layer_impl = static_cast<NinePatchLayerImpl*>(layer);
 
-  layer_impl->SetLayout(image_aperture_, border_, layer_occlusion_,
-                        fill_center_, nearest_neighbor_);
-}
-
-static gfx::RectF BoundsToRect(int x1, int y1, int x2, int y2) {
-  return gfx::RectF(x1, y1, x2 - x1, y2 - y1);
-}
-
-static gfx::RectF NormalizedRect(const gfx::RectF& rect,
-                                 float total_width,
-                                 float total_height) {
-  return gfx::RectF(rect.x() / total_width, rect.y() / total_height,
-                    rect.width() / total_width, rect.height() / total_height);
+  layer_impl->quad_generator_ = this->quad_generator_;
 }
 
 void NinePatchLayerImpl::SetLayout(const gfx::Rect& aperture,
@@ -70,240 +41,17 @@ void NinePatchLayerImpl::SetLayout(const gfx::Rect& aperture,
   // exist before SetLayout can be called.
   DCHECK(ui_resource_id_);
 
-  if (image_aperture_ == aperture && border_ == border &&
-      fill_center_ == fill_center && nearest_neighbor_ == nearest_neighbor &&
-      layer_occlusion_ == layer_occlusion)
+  if (!quad_generator_.SetLayout(image_bounds_, bounds(), aperture, border,
+                                 layer_occlusion, fill_center,
+                                 nearest_neighbor))
     return;
 
-  image_aperture_ = aperture;
-  border_ = border;
-  fill_center_ = fill_center;
-  nearest_neighbor_ = nearest_neighbor;
-  layer_occlusion_ = layer_occlusion;
-
   NoteLayerPropertyChanged();
 }
 
-void NinePatchLayerImpl::CheckGeometryLimitations() {
-  // |border| is in layer space.  It cannot exceed the bounds of the layer.
-  DCHECK_GE(bounds().width(), border_.width());
-  DCHECK_GE(bounds().height(), border_.height());
-
-  // Sanity Check on |border|
-  DCHECK_LE(border_.x(), border_.width());
-  DCHECK_LE(border_.y(), border_.height());
-  DCHECK_GE(border_.x(), 0);
-  DCHECK_GE(border_.y(), 0);
-
-  // |aperture| is in image space.  It cannot exceed the bounds of the bitmap.
-  DCHECK(!image_aperture_.size().IsEmpty());
-  DCHECK(gfx::Rect(image_bounds_).Contains(image_aperture_))
-      << "image_bounds_ " << gfx::Rect(image_bounds_).ToString()
-      << " image_aperture_ " << image_aperture_.ToString();
-
-  // Sanity check on |layer_occlusion_|. It should always be within the
-  // border.
-  gfx::Rect border_rect(border_.x(), border_.y(),
-                        bounds().width() - border_.width(),
-                        bounds().height() - border_.height());
-  DCHECK(layer_occlusion_.IsEmpty() || layer_occlusion_.Contains(border_rect))
-      << "border_rect " << border_rect.ToString() << " layer_occlusion_ "
-      << layer_occlusion_.ToString();
-}
-
-std::vector<NinePatchLayerImpl::Patch>
-NinePatchLayerImpl::ComputeQuadsWithoutOcclusion() const {
-  float image_width = image_bounds_.width();
-  float image_height = image_bounds_.height();
-  float layer_width = bounds().width();
-  float layer_height = bounds().height();
-  gfx::RectF layer_aperture(border_.x(), border_.y(),
-                            layer_width - border_.width(),
-                            layer_height - border_.height());
-
-  std::vector<Patch> patches;
-  patches.reserve(kMaxPatches);
-
-  // Top-left.
-  patches.push_back(
-      Patch(BoundsToRect(0, 0, image_aperture_.x(), image_aperture_.y()),
-            BoundsToRect(0, 0, layer_aperture.x(), layer_aperture.y())));
-
-  // Top-right.
-  patches.push_back(Patch(BoundsToRect(image_aperture_.right(), 0, image_width,
-                                       image_aperture_.y()),
-                          BoundsToRect(layer_aperture.right(), 0, layer_width,
-                                       layer_aperture.y())));
-
-  // Bottom-left.
-  patches.push_back(Patch(BoundsToRect(0, image_aperture_.bottom(),
-                                       image_aperture_.x(), image_height),
-                          BoundsToRect(0, layer_aperture.bottom(),
-                                       layer_aperture.x(), layer_height)));
-
-  // Bottom-right.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.right(), image_aperture_.bottom(),
-                         image_width, image_height),
-            BoundsToRect(layer_aperture.right(), layer_aperture.bottom(),
-                         layer_width, layer_height)));
-
-  // Top.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.x(), 0, image_aperture_.right(),
-                         image_aperture_.y()),
-            BoundsToRect(layer_aperture.x(), 0, layer_aperture.right(),
-                         layer_aperture.y())));
-
-  // Left.
-  patches.push_back(
-      Patch(BoundsToRect(0, image_aperture_.y(), image_aperture_.x(),
-                         image_aperture_.bottom()),
-            BoundsToRect(0, layer_aperture.y(), layer_aperture.x(),
-                         layer_aperture.bottom())));
-
-  // Right.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.right(), image_aperture_.y(),
-                         image_width, image_aperture_.bottom()),
-            BoundsToRect(layer_aperture.right(), layer_aperture.y(),
-                         layer_width, layer_aperture.bottom())));
-
-  // Bottom.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.x(), image_aperture_.bottom(),
-                         image_aperture_.right(), image_height),
-            BoundsToRect(layer_aperture.x(), layer_aperture.bottom(),
-                         layer_aperture.right(), layer_height)));
-
-  // Center.
-  if (fill_center_) {
-    patches.push_back(
-        Patch(BoundsToRect(image_aperture_.x(), image_aperture_.y(),
-                           image_aperture_.right(), image_aperture_.bottom()),
-              BoundsToRect(layer_aperture.x(), layer_aperture.y(),
-                           layer_aperture.right(), layer_aperture.bottom())));
-  }
-
-  return patches;
-}
-
-std::vector<NinePatchLayerImpl::Patch>
-NinePatchLayerImpl::ComputeQuadsWithOcclusion() const {
-  float image_width = image_bounds_.width(),
-        image_height = image_bounds_.height();
-  float layer_width = bounds().width(), layer_height = bounds().height();
-  float layer_border_right = border_.width() - border_.x(),
-        layer_border_bottom = border_.height() - border_.y();
-  float image_aperture_right = image_width - image_aperture_.right(),
-        image_aperture_bottom = image_height - image_aperture_.bottom();
-  float layer_occlusion_right = layer_width - layer_occlusion_.right(),
-        layer_occlusion_bottom = layer_height - layer_occlusion_.bottom();
-  gfx::RectF image_occlusion(BoundsToRect(
-      border_.x() == 0 ? 0 : (layer_occlusion_.x() * image_aperture_.x() /
-                              border_.x()),
-      border_.y() == 0 ? 0 : (layer_occlusion_.y() * image_aperture_.y() /
-                              border_.y()),
-      image_width - (layer_border_right == 0 ? 0 : layer_occlusion_right *
-                                                       image_aperture_right /
-                                                       layer_border_right),
-      image_height - (layer_border_bottom == 0 ? 0 : layer_occlusion_bottom *
-                                                         image_aperture_bottom /
-                                                         layer_border_bottom)));
-  gfx::RectF layer_aperture(border_.x(), border_.y(),
-                            layer_width - border_.width(),
-                            layer_height - border_.height());
-
-  std::vector<Patch> patches;
-  patches.reserve(kMaxOcclusionPatches);
-
-  // Top-left-left.
-  patches.push_back(
-      Patch(BoundsToRect(0, 0, image_occlusion.x(), image_aperture_.y()),
-            BoundsToRect(0, 0, layer_occlusion_.x(), layer_aperture.y())));
-
-  // Top-left-right.
-  patches.push_back(
-      Patch(BoundsToRect(image_occlusion.x(), 0, image_aperture_.x(),
-                         image_occlusion.y()),
-            BoundsToRect(layer_occlusion_.x(), 0, layer_aperture.x(),
-                         layer_occlusion_.y())));
-
-  // Top-center.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.x(), 0, image_aperture_.right(),
-                         image_occlusion.y()),
-            BoundsToRect(layer_aperture.x(), 0, layer_aperture.right(),
-                         layer_occlusion_.y())));
-
-  // Top-right-left.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.right(), 0, image_occlusion.right(),
-                         image_occlusion.y()),
-            BoundsToRect(layer_aperture.right(), 0, layer_occlusion_.right(),
-                         layer_occlusion_.y())));
-
-  // Top-right-right.
-  patches.push_back(Patch(BoundsToRect(image_occlusion.right(), 0, image_width,
-                                       image_aperture_.y()),
-                          BoundsToRect(layer_occlusion_.right(), 0, layer_width,
-                                       layer_aperture.y())));
-
-  // Left-center.
-  patches.push_back(
-      Patch(BoundsToRect(0, image_aperture_.y(), image_occlusion.x(),
-                         image_aperture_.bottom()),
-            BoundsToRect(0, layer_aperture.y(), layer_occlusion_.x(),
-                         layer_aperture.bottom())));
-
-  // Right-center.
-  patches.push_back(
-      Patch(BoundsToRect(image_occlusion.right(), image_aperture_.y(),
-                         image_width, image_aperture_.bottom()),
-            BoundsToRect(layer_occlusion_.right(), layer_aperture.y(),
-                         layer_width, layer_aperture.bottom())));
-
-  // Bottom-left-left.
-  patches.push_back(Patch(BoundsToRect(0, image_aperture_.bottom(),
-                                       image_occlusion.x(), image_height),
-                          BoundsToRect(0, layer_aperture.bottom(),
-                                       layer_occlusion_.x(), layer_height)));
-
-  // Bottom-left-right.
-  patches.push_back(
-      Patch(BoundsToRect(image_occlusion.x(), image_occlusion.bottom(),
-                         image_aperture_.x(), image_height),
-            BoundsToRect(layer_occlusion_.x(), layer_occlusion_.bottom(),
-                         layer_aperture.x(), layer_height)));
-
-  // Bottom-center.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.x(), image_occlusion.bottom(),
-                         image_aperture_.right(), image_height),
-            BoundsToRect(layer_aperture.x(), layer_occlusion_.bottom(),
-                         layer_aperture.right(), layer_height)));
-
-  // Bottom-right-left.
-  patches.push_back(
-      Patch(BoundsToRect(image_aperture_.right(), image_occlusion.bottom(),
-                         image_occlusion.right(), image_height),
-            BoundsToRect(layer_aperture.right(), layer_occlusion_.bottom(),
-                         layer_occlusion_.right(), layer_height)));
-
-  // Bottom-right-right.
-  patches.push_back(
-      Patch(BoundsToRect(image_occlusion.right(), image_aperture_.bottom(),
-                         image_width, image_height),
-            BoundsToRect(layer_occlusion_.right(), layer_aperture.bottom(),
-                         layer_width, layer_height)));
-
-  return patches;
-}
-
 void NinePatchLayerImpl::AppendQuads(
     RenderPass* render_pass,
     AppendQuadsData* append_quads_data) {
-  CheckGeometryLimitations();
   SharedQuadState* shared_quad_state =
       render_pass->CreateAndAppendSharedQuadState();
   PopulateSharedQuadState(shared_quad_state);
@@ -311,47 +59,17 @@ void NinePatchLayerImpl::AppendQuads(
   AppendDebugBorderQuad(render_pass, bounds(), shared_quad_state,
                         append_quads_data);
 
-  if (!ui_resource_id_)
-    return;
-
-  ResourceId resource =
-      layer_tree_impl()->ResourceIdForUIResource(ui_resource_id_);
-
-  if (!resource)
-    return;
-
   DCHECK(!bounds().IsEmpty());
 
-  std::vector<Patch> patches;
+  std::vector<NinePatchGenerator::Patch> patches =
+      quad_generator_.GeneratePatches();
 
-  if (layer_occlusion_.IsEmpty() || fill_center_)
-    patches = ComputeQuadsWithoutOcclusion();
-  else
-    patches = ComputeQuadsWithOcclusion();
+  for (auto& patch : patches)
+    patch.output_rect =
+        gfx::RectF(gfx::ToFlooredRectDeprecated(patch.output_rect));
 
-  const float vertex_opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
-  const bool opaque = layer_tree_impl()->IsUIResourceOpaque(ui_resource_id_);
-  static const bool flipped = false;
-  static const bool premultiplied_alpha = true;
-
-  for (const auto& patch : patches) {
-    gfx::Rect visible_rect =
-        draw_properties().occlusion_in_content_space.GetUnoccludedContentRect(
-            ToRect(patch.layer_rect));
-    gfx::Rect opaque_rect = opaque ? visible_rect : gfx::Rect();
-    if (!visible_rect.IsEmpty()) {
-      gfx::RectF image_rect(NormalizedRect(
-          patch.image_rect, image_bounds_.width(), image_bounds_.height()));
-      TextureDrawQuad* quad =
-          render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
-      quad->SetNew(shared_quad_state, ToRect(patch.layer_rect), opaque_rect,
-                   visible_rect, resource, premultiplied_alpha,
-                   image_rect.origin(), image_rect.bottom_right(),
-                   SK_ColorTRANSPARENT, vertex_opacity, flipped,
-                   nearest_neighbor_, false);
-      ValidateQuadResources(quad);
-    }
-  }
+  quad_generator_.AppendQuads(this, ui_resource_id_, render_pass,
+                              shared_quad_state, patches);
 }
 
 const char* NinePatchLayerImpl::LayerTypeAsString() const {
@@ -360,30 +78,7 @@ const char* NinePatchLayerImpl::LayerTypeAsString() const {
 
 std::unique_ptr<base::DictionaryValue> NinePatchLayerImpl::LayerTreeAsJson() {
   std::unique_ptr<base::DictionaryValue> result = LayerImpl::LayerTreeAsJson();
-
-  base::ListValue* list = new base::ListValue;
-  list->AppendInteger(image_aperture_.origin().x());
-  list->AppendInteger(image_aperture_.origin().y());
-  list->AppendInteger(image_aperture_.size().width());
-  list->AppendInteger(image_aperture_.size().height());
-  result->Set("ImageAperture", list);
-
-  list = new base::ListValue;
-  list->AppendInteger(image_bounds_.width());
-  list->AppendInteger(image_bounds_.height());
-  result->Set("ImageBounds", list);
-
-  result->Set("Border", MathUtil::AsValue(border_).release());
-
-  result->SetBoolean("FillCenter", fill_center_);
-
-  list = new base::ListValue;
-  list->AppendInteger(layer_occlusion_.x());
-  list->AppendInteger(layer_occlusion_.y());
-  list->AppendInteger(layer_occlusion_.width());
-  list->AppendInteger(layer_occlusion_.height());
-  result->Set("LayerOcclusion", list);
-
+  quad_generator_.AsJson(result.get());
   return result;
 }