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// 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/solid_color_layer_impl.h"
#include <algorithm>
#include "cc/layers/append_quads_data.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/trees/occlusion.h"
namespace cc {
namespace {
const int kSolidQuadTileSize = 256;
}
SolidColorLayerImpl::SolidColorLayerImpl(LayerTreeImpl* tree_impl, int id)
: LayerImpl(tree_impl, id) {
}
SolidColorLayerImpl::~SolidColorLayerImpl() {}
std::unique_ptr<LayerImpl> SolidColorLayerImpl::CreateLayerImpl(
LayerTreeImpl* tree_impl) {
return SolidColorLayerImpl::Create(tree_impl, id());
}
void SolidColorLayerImpl::AppendSolidQuads(
RenderPass* render_pass,
const Occlusion& occlusion_in_layer_space,
SharedQuadState* shared_quad_state,
const gfx::Rect& visible_layer_rect,
SkColor color,
AppendQuadsData* append_quads_data) {
float alpha =
(SkColorGetA(color) * (1.0f / 255.0f)) * shared_quad_state->opacity;
DCHECK_EQ(SkBlendMode::kSrcOver, shared_quad_state->blend_mode);
if (alpha < std::numeric_limits<float>::epsilon())
return;
// We create a series of smaller quads instead of just one large one so that
// the culler can reduce the total pixels drawn.
int right = visible_layer_rect.right();
int bottom = visible_layer_rect.bottom();
for (int x = visible_layer_rect.x(); x < visible_layer_rect.right();
x += kSolidQuadTileSize) {
for (int y = visible_layer_rect.y(); y < visible_layer_rect.bottom();
y += kSolidQuadTileSize) {
gfx::Rect quad_rect(x,
y,
std::min(right - x, kSolidQuadTileSize),
std::min(bottom - y, kSolidQuadTileSize));
gfx::Rect visible_quad_rect =
occlusion_in_layer_space.GetUnoccludedContentRect(quad_rect);
if (visible_quad_rect.IsEmpty())
continue;
append_quads_data->visible_layer_area +=
visible_quad_rect.width() * visible_quad_rect.height();
SolidColorDrawQuad* quad =
render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
quad->SetNew(
shared_quad_state, quad_rect, visible_quad_rect, color, false);
}
}
}
void SolidColorLayerImpl::AppendQuads(
RenderPass* render_pass,
AppendQuadsData* append_quads_data) {
SharedQuadState* shared_quad_state =
render_pass->CreateAndAppendSharedQuadState();
PopulateSharedQuadState(shared_quad_state);
AppendDebugBorderQuad(render_pass, bounds(), shared_quad_state,
append_quads_data);
// TODO(hendrikw): We need to pass the visible content rect rather than
// |bounds()| here.
AppendSolidQuads(render_pass, draw_properties().occlusion_in_content_space,
shared_quad_state, gfx::Rect(bounds()), background_color(),
append_quads_data);
}
const char* SolidColorLayerImpl::LayerTypeAsString() const {
return "cc::SolidColorLayerImpl";
}
} // namespace cc