blob: 19ea376deb39c9e142e7ec89d6b231e25e8f13ec [file] [log] [blame]
* Copyright 2015 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/core/SkString.h"
#include "src/core/SkLocalMatrixImageFilter.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkSpecialImage.h"
sk_sp<SkImageFilter> SkLocalMatrixImageFilter::Make(const SkMatrix& localM,
sk_sp<SkImageFilter> input) {
if (!input) {
return nullptr;
if (localM.isIdentity()) {
return input;
if (!as_IFB(input)->canHandleComplexCTM() && !localM.isScaleTranslate()) {
// Nothing we can do at this point
return nullptr;
return sk_sp<SkImageFilter>(new SkLocalMatrixImageFilter(localM, input));
SkLocalMatrixImageFilter::SkLocalMatrixImageFilter(const SkMatrix& localM,
sk_sp<SkImageFilter> input)
: INHERITED(&input, 1, nullptr)
, fLocalM(localM) {
sk_sp<SkFlattenable> SkLocalMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
SkMatrix lm;
return SkLocalMatrixImageFilter::Make(lm, common.getInput(0));
void SkLocalMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
sk_sp<SkSpecialImage> SkLocalMatrixImageFilter::onFilterImage(const Context& ctx,
SkIPoint* offset) const {
Context localCtx = ctx.withNewMapping(ctx.mapping().concatLocal(fLocalM));
return this->filterInput(0, localCtx, offset);
SkIRect SkLocalMatrixImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection dir, const SkIRect* inputRect) const {
return this->getInput(0)->filterBounds(src, SkMatrix::Concat(ctm, fLocalM), dir, inputRect);
SkRect SkLocalMatrixImageFilter::computeFastBounds(const SkRect& bounds) const {
// In order to match the behavior of onFilterBounds, we map 'bounds' by the inverse of our
// local matrix, pass that to our child, and then map the result by our local matrix.
SkMatrix localInv;
if (!fLocalM.invert(&localInv)) {
return this->getInput(0)->computeFastBounds(bounds);
SkRect localBounds = localInv.mapRect(bounds);
return fLocalM.mapRect(this->getInput(0)->computeFastBounds(localBounds));