cc: Distinguish single texture mask from normal masks

cc/layers/picture_layer_impl.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 74 matching lines @@
   return gfx::Rect(rx, ry, static_cast<int>(rr - rx),
                    static_cast<int>(rb - ry));
 }
 
 }  // namespace
 
 namespace cc {
 
 PictureLayerImpl::PictureLayerImpl(LayerTreeImpl* tree_impl,
                                    int id,
-                                   bool is_mask)
+                                   Layer::LayerMaskType mask_type)
     : LayerImpl(tree_impl, id),
       twin_layer_(nullptr),
       tilings_(CreatePictureLayerTilingSet()),
       ideal_page_scale_(0.f),
       ideal_device_scale_(0.f),
       ideal_source_scale_(0.f),
       ideal_contents_scale_(0.f),
       raster_page_scale_(0.f),
       raster_device_scale_(0.f),
       raster_source_scale_(0.f),
       raster_contents_scale_(0.f),
       low_res_raster_contents_scale_(0.f),
       was_screen_space_transform_animating_(false),
       only_used_low_res_last_append_quads_(false),
-      is_mask_(is_mask),
+      mask_type_(mask_type),
       nearest_neighbor_(false),
       is_directly_composited_image_(false) {
   layer_tree_impl()->RegisterPictureLayerImpl(this);
 }
 
 PictureLayerImpl::~PictureLayerImpl() {
   if (twin_layer_)
     twin_layer_->twin_layer_ = nullptr;
   layer_tree_impl()->UnregisterPictureLayerImpl(this);
 }
 
 const char* PictureLayerImpl::LayerTypeAsString() const {
   return "cc::PictureLayerImpl";
 }
 
 std::unique_ptr<LayerImpl> PictureLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return PictureLayerImpl::Create(tree_impl, id(), is_mask_);
+  return PictureLayerImpl::Create(tree_impl, id(), mask_type());
 }
 
 void PictureLayerImpl::PushPropertiesTo(LayerImpl* base_layer) {
   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
-  DCHECK_EQ(layer_impl->is_mask_, is_mask_);
+  DCHECK_EQ(layer_impl->mask_type_, mask_type_);
 
   LayerImpl::PushPropertiesTo(base_layer);
 
   // Twin relationships should never change once established.
   DCHECK(!twin_layer_ || twin_layer_ == layer_impl);
   DCHECK(!twin_layer_ || layer_impl->twin_layer_ == this);
   // The twin relationship does not need to exist before the first
   // PushPropertiesTo from pending to active layer since before that the active
   // layer can not have a pile or tilings, it has only been created and inserted
   // into the tree at that point.
@@ skipping 543 matching lines @@
   // representation of what was invalidated that is cleared after drawing.
   return IntersectRegions(invalidation_, update_rect());
 }
 
 std::unique_ptr<Tile> PictureLayerImpl::CreateTile(
     const Tile::CreateInfo& info) {
   int flags = 0;
 
   // We don't handle solid color masks, so we shouldn't bother analyzing those.
   // Otherwise, always analyze to maximize memory savings.
-  if (!is_mask_)
+  // TODO(sunxd): the condition should be (mask_type_ ==
+  // Layer::LayerMaskType::NOT_MASK
+  // || (layer_tree_impl()->settings().enable_mask_tiling && mask_type ==
+  // Layer::LayerMaskType::MULTI_TEXTURE_MASK)).
+  if (mask_type_ == Layer::LayerMaskType::NOT_MASK)
     flags = Tile::USE_PICTURE_ANALYSIS;
 
   if (contents_opaque())
     flags |= Tile::IS_OPAQUE;
 
   return layer_tree_impl()->tile_manager()->CreateTile(
       info, id(), layer_tree_impl()->source_frame_number(), flags);
 }
 
 const Region* PictureLayerImpl::GetPendingInvalidation() {
@@ skipping 21 matching lines @@
 
 gfx::Rect PictureLayerImpl::GetEnclosingRectInTargetSpace() const {
   return GetScaledEnclosingRectInTargetSpace(MaximumTilingContentsScale());
 }
 
 gfx::Size PictureLayerImpl::CalculateTileSize(
     const gfx::Size& content_bounds) const {
   int max_texture_size =
       layer_tree_impl()->resource_provider()->max_texture_size();
 
-  if (is_mask_) {
+  // TODO(sunxd): the condition should be mask_type_ == Layer::LayerMaskType::
+  // SINGLE_TEXTURE_MASK || (mask_type_ ==
+  // Layer::LayerMaskType::MULTI_TEXTURE_MASK &&
+  // !layer_tree_impl()->settings().enable_mask_tiling)
+  if (mask_type_ != Layer::LayerMaskType::NOT_MASK) {
     // Masks are not tiled, so if we can't cover the whole mask with one tile,
     // we shouldn't have such a tiling at all.
     DCHECK_LE(content_bounds.width(), max_texture_size);
     DCHECK_LE(content_bounds.height(), max_texture_size);
     return content_bounds;
   }
 
   int default_tile_width = 0;
   int default_tile_height = 0;
   if (layer_tree_impl()->use_gpu_rasterization()) {
@@ skipping 417 matching lines @@
     return setting_min;
 
   return std::max(1.f / min_dimension, setting_min);
 }
 
 float PictureLayerImpl::MaximumContentsScale() const {
   // Masks can not have tilings that would become larger than the
   // max_texture_size since they use a single tile for the entire
   // tiling. Other layers can have tilings such that dimension * scale
   // does not overflow.
+  // TODO(sunxd): the condition should be:
+  // mask_type_ == Layer::LayerMaskType::SINGLE_TEXTURE_MASK || (mask_type_ ==
+  // Layer::LayerMaskType::MULTI_TEXTURE_MASK && !layer_tree_impl()->settings().
+  // enable_mask_tiling)
   float max_dimension = static_cast<float>(
-      is_mask_ ? layer_tree_impl()->resource_provider()->max_texture_size()
-               : std::numeric_limits<int>::max());
+      mask_type_ != Layer::LayerMaskType::NOT_MASK
+          ? layer_tree_impl()->resource_provider()->max_texture_size()
+          : std::numeric_limits<int>::max());
   float max_scale_width = max_dimension / bounds().width();
   float max_scale_height = max_dimension / bounds().height();
   float max_scale = std::min(max_scale_width, max_scale_height);
 
   // We require that multiplying the layer size by the contents scale and
   // ceiling produces a value <= |max_dimension|. Because for large layer
   // sizes floating point ambiguity may crop up, making the result larger or
   // smaller than expected, we use a slightly smaller floating point value for
   // the scale, to help ensure that the resulting content bounds will never end
   // up larger than |max_dimension|.
@@ skipping 171 matching lines @@
 bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
   return !layer_tree_impl()->IsRecycleTree();
 }
 
 bool PictureLayerImpl::HasValidTilePriorities() const {
   return IsOnActiveOrPendingTree() &&
          is_drawn_render_surface_layer_list_member();
 }
 
 }  // namespace cc