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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.
#include "skia/ext/opacity_filter_canvas.h"
#include "third_party/skia/include/core/SkPaint.h"
namespace skia {
OpacityFilterCanvas::OpacityFilterCanvas(SkCanvas* canvas,
float opacity,
bool disable_image_filtering)
: INHERITED(canvas),
opacity_(opacity),
disable_image_filtering_(disable_image_filtering) {}
bool OpacityFilterCanvas::onFilter(SkPaint& paint) const {
if (opacity_ < 1.f)
paint.setAlphaf(paint.getAlphaf() * opacity_);
return true;
}
void OpacityFilterCanvas::onDrawImage2(const SkImage* image,
SkScalar dx,
SkScalar dy,
const SkSamplingOptions& sampling,
const SkPaint* paint) {
this->INHERITED::onDrawImage2(
image, dx, dy, disable_image_filtering_ ? SkSamplingOptions() : sampling,
paint);
}
void OpacityFilterCanvas::onDrawImageRect2(const SkImage* image,
const SkRect& src,
const SkRect& dst,
const SkSamplingOptions& sampling,
const SkPaint* paint,
SrcRectConstraint constraint) {
this->INHERITED::onDrawImageRect2(
image, src, dst,
disable_image_filtering_ ? SkSamplingOptions() : sampling, paint,
constraint);
}
void OpacityFilterCanvas::onDrawEdgeAAImageSet2(
const ImageSetEntry imageSet[],
int count,
const SkPoint dstClips[],
const SkMatrix preViewMatrices[],
const SkSamplingOptions& sampling,
const SkPaint* paint,
SrcRectConstraint constraint) {
this->INHERITED::onDrawEdgeAAImageSet2(
imageSet, count, dstClips, preViewMatrices,
disable_image_filtering_ ? SkSamplingOptions() : sampling, paint,
constraint);
}
void OpacityFilterCanvas::onDrawPicture(const SkPicture* picture,
const SkMatrix* matrix,
const SkPaint* paint) {
SkPaint filteredPaint(paint ? *paint : SkPaint());
if (this->onFilter(filteredPaint)) {
// Unfurl pictures in order to filter nested paints.
this->SkCanvas::onDrawPicture(picture, matrix, &filteredPaint);
}
}
} // namespace skia
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