blob: dd5da7d254153c1ead7118af16b4a36cb2b2216b [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 "src/core/SkLocalMatrixImageFilter.h"
#include "include/core/SkImageFilter.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
sk_sp<SkImageFilter> SkLocalMatrixImageFilter::Make(const SkMatrix& localMatrix,
sk_sp<SkImageFilter> input) {
if (!input) {
return nullptr;
if (localMatrix.isIdentity()) {
return input;
MatrixCapability inputCapability = as_IFB(input)->getCTMCapability();
if ((inputCapability == MatrixCapability::kTranslate && !localMatrix.isTranslate()) ||
(inputCapability == MatrixCapability::kScaleTranslate && !localMatrix.isScaleTranslate())) {
// Nothing we can do at this point
return nullptr;
SkMatrix invLocal;
if (!localMatrix.invert(&invLocal)) {
return nullptr;
return sk_sp<SkImageFilter>(new SkLocalMatrixImageFilter(localMatrix, invLocal, &input));
sk_sp<SkFlattenable> SkLocalMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
SkMatrix lm;
return SkLocalMatrixImageFilter::Make(lm, common.getInput(0));
void SkLocalMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
// fInvLocalMatrix will be reconstructed
skif::Mapping SkLocalMatrixImageFilter::localMapping(const skif::Mapping& mapping) const {
skif::Mapping localMapping = mapping;
return localMapping;
skif::FilterResult SkLocalMatrixImageFilter::onFilterImage(const skif::Context& ctx) const {
skif::Mapping localMapping = this->localMapping(ctx.mapping());
return this->getChildOutput(0, ctx.withNewMapping(localMapping));
skif::LayerSpace<SkIRect> SkLocalMatrixImageFilter::onGetInputLayerBounds(
const skif::Mapping& mapping,
const skif::LayerSpace<SkIRect>& desiredOutput,
std::optional<skif::LayerSpace<SkIRect>> contentBounds) const {
// The local matrix changes 'mapping' by adjusting the parameter space of the image filter, but
// both 'desiredOutput' and 'contentBounds' have already been transformed to the consistent
// layer space. They remain unchanged with the new mapping.
return this->getChildInputLayerBounds(0, this->localMapping(mapping),
desiredOutput, contentBounds);
std::optional<skif::LayerSpace<SkIRect>> SkLocalMatrixImageFilter::onGetOutputLayerBounds(
const skif::Mapping& mapping,
std::optional<skif::LayerSpace<SkIRect>> contentBounds) const {
return this->getChildOutputLayerBounds(0, this->localMapping(mapping), contentBounds);
SkRect SkLocalMatrixImageFilter::computeFastBounds(const SkRect& bounds) const {
// In onGet[Input|Output]LayerBounds, there is a Mapping that can be adjusted by the
// local matrix, so their layer-space parameters do not need to be modified. Since
// computeFastBounds() takes no matrix, it always operates as if it has the identity mapping.
// In order to match the behavior of onGetInputLayerBounds, we map 'bounds' by the inverse of
// the local matrix, pass that to the child, and then map the result by the local matrix.
// TODO: Implementing computeFastBounds in terms of onGetOutputLayerBounds() trivially removes
// this complexity.
SkRect localBounds = fInvLocalMatrix.mapRect(bounds);
return fLocalMatrix.mapRect(this->getInput(0)->computeFastBounds(localBounds));