blob: d127a30a66be10dd62a0ff58752f1eb983acbb0e [file] [log] [blame]
* Copyright 2015 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkLocalMatrixImageFilter_DEFINED
#define SkLocalMatrixImageFilter_DEFINED
#include "include/core/SkFlattenable.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "src/core/SkImageFilterTypes.h"
#include "src/core/SkImageFilter_Base.h"
#include <optional>
class SkImageFilter;
class SkReadBuffer;
class SkWriteBuffer;
* Wraps another imagefilter + matrix, such that using this filter will give the same result
* as using the wrapped filter with the matrix applied to its context.
class SkLocalMatrixImageFilter : public SkImageFilter_Base {
static sk_sp<SkImageFilter> Make(const SkMatrix& localMatrix, sk_sp<SkImageFilter> input);
SkRect computeFastBounds(const SkRect&) const override;
void flatten(SkWriteBuffer&) const override;
SkLocalMatrixImageFilter(const SkMatrix& localMatrix,
const SkMatrix& invLocalMatrix,
sk_sp<SkImageFilter> const* input)
: SkImageFilter_Base(input, 1)
, fLocalMatrix{localMatrix}
, fInvLocalMatrix{invLocalMatrix} {}
MatrixCapability onGetCTMCapability() const override { return MatrixCapability::kComplex; }
skif::FilterResult onFilterImage(const skif::Context& ctx) const override;
skif::LayerSpace<SkIRect> onGetInputLayerBounds(
const skif::Mapping&,
const skif::LayerSpace<SkIRect>& desiredOutput,
std::optional<skif::LayerSpace<SkIRect>> contentBounds) const override;
std::optional<skif::LayerSpace<SkIRect>> onGetOutputLayerBounds(
const skif::Mapping&,
std::optional<skif::LayerSpace<SkIRect>> contentBounds) const override;
skif::Mapping localMapping(const skif::Mapping&) const;
// NOTE: This is not a ParameterSpace<SkMatrix> like that of SkMatrixTransformImageFilter.
// It's a bit pedantic, but does impact the math. A parameter-space transform has to be modified
// to represent a layer-space transform: (L*P*L^-1); while this local matrix changes L directly
// to L*P for its child filter.
SkMatrix fLocalMatrix;
SkMatrix fInvLocalMatrix;