cc/layers/solid_color_layer_impl.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/layers/solid_color_layer_impl.h"
   6
   7 #include <algorithm>
   8
   9 #include "cc/layers/append_quads_data.h"
  10 #include "cc/quads/solid_color_draw_quad.h"
  11 #include "cc/trees/occlusion.h"
  12
  13 namespace cc {
  14
  15 namespace {
  16 const int kSolidQuadTileSize = 256;
  17 }
  18
  19 SolidColorLayerImpl::SolidColorLayerImpl(LayerTreeImpl* tree_impl, int id)
  20     : LayerImpl(tree_impl, id) {
  21 }
  22
  23 SolidColorLayerImpl::~SolidColorLayerImpl() {}
  24
  25 scoped_ptr<LayerImpl> SolidColorLayerImpl::CreateLayerImpl(
  26     LayerTreeImpl* tree_impl) {
  27   return SolidColorLayerImpl::Create(tree_impl, id());
  28 }
  29
  30 void SolidColorLayerImpl::AppendSolidQuads(
  31     RenderPass* render_pass,
  32     const Occlusion& occlusion_in_content_space,
  33     SharedQuadState* shared_quad_state,
  34     const gfx::Size& content_bounds,
  35     SkColor color,
  36     AppendQuadsData* append_quads_data) {
  37   // We create a series of smaller quads instead of just one large one so that
  38   // the culler can reduce the total pixels drawn.
  39   int width = content_bounds.width();
  40   int height = content_bounds.height();
  41   for (int x = 0; x < width; x += kSolidQuadTileSize) {
  42     for (int y = 0; y < height; y += kSolidQuadTileSize) {
  43       gfx::Rect quad_rect(x,
  44                           y,
  45                           std::min(width - x, kSolidQuadTileSize),
  46                           std::min(height - y, kSolidQuadTileSize));
  47       gfx::Rect visible_quad_rect =
  48           occlusion_in_content_space.GetUnoccludedContentRect(quad_rect);
  49       if (visible_quad_rect.IsEmpty())
  50         continue;
  51
  52       append_quads_data->visible_content_area +=
  53           visible_quad_rect.width() * visible_quad_rect.height();
  54
  55       SolidColorDrawQuad* quad =
  56           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
  57       quad->SetNew(
  58           shared_quad_state, quad_rect, visible_quad_rect, color, false);
  59     }
  60   }
  61 }
  62
  63 void SolidColorLayerImpl::AppendQuads(
  64     RenderPass* render_pass,
  65     const Occlusion& occlusion_in_content_space,
  66     AppendQuadsData* append_quads_data) {
  67   SharedQuadState* shared_quad_state =
  68       render_pass->CreateAndAppendSharedQuadState();
  69   PopulateSharedQuadState(shared_quad_state);
  70
  71   AppendDebugBorderQuad(
  72       render_pass, content_bounds(), shared_quad_state, append_quads_data);
  73
  74   AppendSolidQuads(render_pass,
  75                    occlusion_in_content_space,
  76                    shared_quad_state,
  77                    content_bounds(),
  78                    background_color(),
  79                    append_quads_data);
  80 }
  81
  82 const char* SolidColorLayerImpl::LayerTypeAsString() const {
  83   return "cc::SolidColorLayerImpl";
  84 }
  85
  86 }  // namespace cc