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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 "config.h"
#include "caching_bitmap_canvas_layer_updater.h"
#include "cc/layer_painter.h"
#include "skia/ext/platform_canvas.h"
namespace cc {
scoped_refptr<CachingBitmapCanvasLayerUpdater>
CachingBitmapCanvasLayerUpdater::Create(
scoped_ptr<LayerPainter> painter) {
return make_scoped_refptr(new CachingBitmapCanvasLayerUpdater(
painter.Pass()));
}
CachingBitmapCanvasLayerUpdater::CachingBitmapCanvasLayerUpdater(
scoped_ptr<LayerPainter> painter)
: BitmapCanvasLayerUpdater(painter.Pass()),
pixels_did_change_(false) {
}
CachingBitmapCanvasLayerUpdater::
~CachingBitmapCanvasLayerUpdater()
{
}
void CachingBitmapCanvasLayerUpdater::prepareToUpdate(
const IntRect& content_rect,
const IntSize& tile_size,
float contents_width_scale,
float contents_height_scale,
IntRect& resulting_opaque_rect,
RenderingStats& stats) {
BitmapCanvasLayerUpdater::prepareToUpdate(content_rect,
tile_size,
contents_width_scale,
contents_height_scale,
resulting_opaque_rect,
stats);
const SkBitmap& new_bitmap = m_canvas->getDevice()->accessBitmap(false);
SkAutoLockPixels lock(new_bitmap);
DCHECK(new_bitmap.bytesPerPixel() > 0);
pixels_did_change_ = new_bitmap.config() != cached_bitmap_.config() ||
new_bitmap.height() != cached_bitmap_.height() ||
new_bitmap.width() != cached_bitmap_.width() ||
memcmp(new_bitmap.getPixels(),
cached_bitmap_.getPixels(),
new_bitmap.getSafeSize());
if (pixels_did_change_)
new_bitmap.deepCopyTo(&cached_bitmap_, new_bitmap.config());
}
bool CachingBitmapCanvasLayerUpdater::pixelsDidChange() const
{
return pixels_did_change_;
}
} // namespace cc
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