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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkComposeImageFilter.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkWriteBuffer.h"
void SkComposeImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
SkImageFilter* outer = getInput(0);
SkImageFilter* inner = getInput(1);
SkRect tmp;
inner->computeFastBounds(src, &tmp);
outer->computeFastBounds(tmp, dst);
}
SkSpecialImage* SkComposeImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
SkIPoint* offset) const {
// The bounds passed to the inner filter must be filtered by the outer
// filter, so that the inner filter produces the pixels that the outer
// filter requires as input. This matters if the outer filter moves pixels.
SkIRect innerClipBounds;
getInput(0)->filterBounds(ctx.clipBounds(), ctx.ctm(), &innerClipBounds);
Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache());
SkIPoint innerOffset = SkIPoint::Make(0, 0);
SkAutoTUnref<SkSpecialImage> inner(this->filterInput(1, source, innerContext, &innerOffset));
if (!inner) {
return nullptr;
}
SkMatrix outerMatrix(ctx.ctm());
outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y()));
SkIRect clipBounds = ctx.clipBounds();
clipBounds.offset(-innerOffset.x(), -innerOffset.y());
Context outerContext(outerMatrix, clipBounds, ctx.cache());
SkIPoint outerOffset = SkIPoint::Make(0, 0);
SkAutoTUnref<SkSpecialImage> outer(this->filterInput(0, inner, outerContext, &outerOffset));
if (!outer) {
return nullptr;
}
*offset = innerOffset + outerOffset;
return outer.release();
}
bool SkComposeImageFilter::onFilterBounds(const SkIRect& src,
const SkMatrix& ctm,
SkIRect* dst,
MapDirection direction) const {
SkImageFilter* outer = this->getInput(0);
SkImageFilter* inner = this->getInput(1);
SkIRect tmp;
return inner->filterBounds(src, ctm, &tmp, direction) &&
outer->filterBounds(tmp, ctm, dst, direction);
}
SkFlattenable* SkComposeImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
return SkComposeImageFilter::Create(common.getInput(0), common.getInput(1));
}
#ifndef SK_IGNORE_TO_STRING
void SkComposeImageFilter::toString(SkString* str) const {
SkImageFilter* outer = getInput(0);
SkImageFilter* inner = getInput(1);
str->appendf("SkComposeImageFilter: (");
str->appendf("outer: ");
outer->toString(str);
str->appendf("inner: ");
inner->toString(str);
str->appendf(")");
}
#endif
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