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// Copyright 2010 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/image_layer.h"
#include "base/compiler_specific.h"
#include "cc/resources/image_layer_updater.h"
#include "cc/resources/layer_updater.h"
#include "cc/resources/prioritized_resource.h"
#include "cc/resources/resource_update_queue.h"
#include "cc/trees/layer_tree_host.h"
namespace cc {
scoped_refptr<ImageLayer> ImageLayer::Create() {
return make_scoped_refptr(new ImageLayer());
}
ImageLayer::ImageLayer() : TiledLayer() {}
ImageLayer::~ImageLayer() {}
void ImageLayer::SetBitmap(const SkBitmap& bitmap) {
// SetBitmap() currently gets called whenever there is any
// style change that affects the layer even if that change doesn't
// affect the actual contents of the image (e.g. a CSS animation).
// With this check in place we avoid unecessary texture uploads.
if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
return;
bitmap_ = bitmap;
SetNeedsDisplay();
}
void ImageLayer::SetTexturePriorities(const PriorityCalculator& priority_calc) {
// Update the tile data before creating all the layer's tiles.
UpdateTileSizeAndTilingOption();
TiledLayer::SetTexturePriorities(priority_calc);
}
bool ImageLayer::Update(ResourceUpdateQueue* queue,
const OcclusionTracker<Layer>* occlusion) {
CreateUpdaterIfNeeded();
if (!updater_->UsingBitmap(bitmap_)) {
updater_->SetBitmap(bitmap_);
UpdateTileSizeAndTilingOption();
InvalidateContentRect(gfx::Rect(content_bounds()));
}
return TiledLayer::Update(queue, occlusion);
}
void ImageLayer::CreateUpdaterIfNeeded() {
if (updater_.get())
return;
updater_ = ImageLayerUpdater::Create();
SetTextureFormat(
layer_tree_host()->GetRendererCapabilities().best_texture_format);
}
LayerUpdater* ImageLayer::Updater() const {
return updater_.get();
}
void ImageLayer::CalculateContentsScale(float ideal_contents_scale,
float device_scale_factor,
float page_scale_factor,
float maximum_animation_contents_scale,
bool animating_transform_to_screen,
float* contents_scale_x,
float* contents_scale_y,
gfx::Size* content_bounds) {
*contents_scale_x = ImageContentsScaleX();
*contents_scale_y = ImageContentsScaleY();
*content_bounds = gfx::Size(bitmap_.width(), bitmap_.height());
}
bool ImageLayer::DrawsContent() const {
return !bitmap_.isNull() && TiledLayer::DrawsContent();
}
void ImageLayer::OnOutputSurfaceCreated() {
SetTextureFormat(
layer_tree_host()->GetRendererCapabilities().best_texture_format);
TiledLayer::OnOutputSurfaceCreated();
}
float ImageLayer::ImageContentsScaleX() const {
if (bounds().IsEmpty() || bitmap_.width() == 0)
return 1;
return static_cast<float>(bitmap_.width()) / bounds().width();
}
float ImageLayer::ImageContentsScaleY() const {
if (bounds().IsEmpty() || bitmap_.height() == 0)
return 1;
return static_cast<float>(bitmap_.height()) / bounds().height();
}
} // namespace cc
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