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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/picture_image_layer.h"
#include <stddef.h>
#include "cc/layers/picture_image_layer_impl.h"
#include "cc/playback/display_item_list_settings.h"
#include "cc/playback/drawing_display_item.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"
#include "ui/gfx/skia_util.h"
namespace cc {
scoped_refptr<PictureImageLayer> PictureImageLayer::Create(
const LayerSettings& settings) {
return make_scoped_refptr(new PictureImageLayer(settings));
}
PictureImageLayer::PictureImageLayer(const LayerSettings& settings)
: PictureLayer(settings, this) {
}
PictureImageLayer::~PictureImageLayer() {
ClearClient();
}
scoped_ptr<LayerImpl> PictureImageLayer::CreateLayerImpl(
LayerTreeImpl* tree_impl) {
return PictureImageLayerImpl::Create(tree_impl, id(), is_mask());
}
bool PictureImageLayer::HasDrawableContent() const {
return image_ && PictureLayer::HasDrawableContent();
}
void PictureImageLayer::SetImage(skia::RefPtr<const SkImage> image) {
// SetImage() 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 (image_.get() == image.get())
return;
image_ = std::move(image);
UpdateDrawsContent(HasDrawableContent());
SetNeedsDisplay();
}
gfx::Rect PictureImageLayer::PaintableRegion() {
return gfx::Rect(bounds());
}
scoped_refptr<DisplayItemList> PictureImageLayer::PaintContentsToDisplayList(
ContentLayerClient::PaintingControlSetting painting_control) {
DCHECK(image_);
DCHECK_GT(image_->width(), 0);
DCHECK_GT(image_->height(), 0);
// Picture image layers can be used with GatherPixelRefs, so cached SkPictures
// are currently required.
DisplayItemListSettings settings;
settings.use_cached_picture = true;
scoped_refptr<DisplayItemList> display_list =
DisplayItemList::Create(PaintableRegion(), settings);
SkPictureRecorder recorder;
SkCanvas* canvas =
recorder.beginRecording(gfx::RectToSkRect(PaintableRegion()));
SkScalar content_to_layer_scale_x =
SkFloatToScalar(static_cast<float>(bounds().width()) / image_->width());
SkScalar content_to_layer_scale_y =
SkFloatToScalar(static_cast<float>(bounds().height()) / image_->height());
canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
// Because Android WebView resourceless software draw mode rasters directly
// to the root canvas, this draw must use the kSrcOver_Mode so that
// transparent images blend correctly.
canvas->drawImage(image_.get(), 0, 0);
skia::RefPtr<SkPicture> picture =
skia::AdoptRef(recorder.endRecordingAsPicture());
display_list->CreateAndAppendItem<DrawingDisplayItem>(PaintableRegion(),
std::move(picture));
display_list->Finalize();
return display_list;
}
bool PictureImageLayer::FillsBoundsCompletely() const {
return false;
}
size_t PictureImageLayer::GetApproximateUnsharedMemoryUsage() const {
return 0;
}
} // namespace cc
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