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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SKIA_EXT_OPACITY_FILTER_CANVAS_H_
#define SKIA_EXT_OPACITY_FILTER_CANVAS_H_
#include "third_party/skia/include/utils/SkPaintFilterCanvas.h"
namespace skia {
// This filter canvas allows setting an opacity on every draw call to a canvas,
// and to disable image filtering. Note that the opacity setting is only
// correct in very limited conditions: when there is only zero or one opaque,
// nonlayer draw for every pixel in the surface.
class SK_API OpacityFilterCanvas : public SkPaintFilterCanvas {
public:
OpacityFilterCanvas(SkCanvas* canvas,
float opacity,
bool disable_image_filtering);
protected:
bool onFilter(SkPaint& paint) const override;
void onDrawImage2(const SkImage*,
SkScalar dx,
SkScalar dy,
const SkSamplingOptions&,
const SkPaint*) override;
void onDrawImageRect2(const SkImage*,
const SkRect& src,
const SkRect& dst,
const SkSamplingOptions&,
const SkPaint*,
SrcRectConstraint) override;
void onDrawEdgeAAImageSet2(const ImageSetEntry imageSet[],
int count,
const SkPoint dstClips[],
const SkMatrix preViewMatrices[],
const SkSamplingOptions&,
const SkPaint*,
SrcRectConstraint) override;
void onDrawPicture(const SkPicture* picture,
const SkMatrix* matrix,
const SkPaint* paint) override;
private:
typedef SkPaintFilterCanvas INHERITED;
float opacity_;
bool disable_image_filtering_;
};
} // namespace skia
#endif // SKIA_EXT_OPACITY_FILTER_CANVAS_H_
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