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/*
* Copyright 2014 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.
*/
#include "SkMatrixImageFilter.h"
#include "SkCanvas.h"
#include "SkColorSpaceXformer.h"
#include "SkImageFilterPriv.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
#include "SkRect.h"
SkMatrixImageFilter::SkMatrixImageFilter(const SkMatrix& transform,
SkFilterQuality filterQuality,
sk_sp<SkImageFilter> input)
: INHERITED(&input, 1, nullptr)
, fTransform(transform)
, fFilterQuality(filterQuality) {
}
sk_sp<SkImageFilter> SkMatrixImageFilter::Make(const SkMatrix& transform,
SkFilterQuality filterQuality,
sk_sp<SkImageFilter> input) {
return sk_sp<SkImageFilter>(new SkMatrixImageFilter(transform,
filterQuality,
std::move(input)));
}
sk_sp<SkFlattenable> SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkMatrix matrix;
buffer.readMatrix(&matrix);
return Make(matrix, buffer.read32LE(kLast_SkFilterQuality), common.getInput(0));
}
void SkMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeMatrix(fTransform);
buffer.writeInt(fFilterQuality);
}
sk_sp<SkSpecialImage> SkMatrixImageFilter::onFilterImage(SkSpecialImage* source,
const Context& ctx,
SkIPoint* offset) const {
SkIPoint inputOffset = SkIPoint::Make(0, 0);
sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
if (!input) {
return nullptr;
}
SkMatrix matrix;
if (!ctx.ctm().invert(&matrix)) {
return nullptr;
}
matrix.postConcat(fTransform);
matrix.postConcat(ctx.ctm());
const SkIRect srcBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
input->width(), input->height());
const SkRect srcRect = SkRect::Make(srcBounds);
SkRect dstRect;
matrix.mapRect(&dstRect, srcRect);
SkIRect dstBounds;
dstRect.roundOut(&dstBounds);
sk_sp<SkSpecialSurface> surf(input->makeSurface(ctx.outputProperties(), dstBounds.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
canvas->clear(0x0);
canvas->translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y()));
canvas->concat(matrix);
SkPaint paint;
paint.setAntiAlias(true);
paint.setBlendMode(SkBlendMode::kSrc);
paint.setFilterQuality(fFilterQuality);
input->draw(canvas, srcRect.x(), srcRect.y(), &paint);
offset->fX = dstBounds.fLeft;
offset->fY = dstBounds.fTop;
return surf->makeImageSnapshot();
}
sk_sp<SkImageFilter> SkMatrixImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkASSERT(1 == this->countInputs());
auto input = xformer->apply(this->getInput(0));
if (input.get() != this->getInput(0)) {
return SkMatrixImageFilter::Make(fTransform, fFilterQuality, std::move(input));
}
return this->refMe();
}
SkRect SkMatrixImageFilter::computeFastBounds(const SkRect& src) const {
SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
SkRect dst;
fTransform.mapRect(&dst, bounds);
return dst;
}
SkIRect SkMatrixImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection dir, const SkIRect* inputRect) const {
SkMatrix matrix;
if (!ctm.invert(&matrix)) {
return src;
}
if (kForward_MapDirection == dir) {
matrix.postConcat(fTransform);
} else {
SkMatrix transformInverse;
if (!fTransform.invert(&transformInverse)) {
return src;
}
matrix.postConcat(transformInverse);
}
matrix.postConcat(ctm);
SkRect floatBounds;
matrix.mapRect(&floatBounds, SkRect::Make(src));
SkIRect result = floatBounds.roundOut();
#ifndef SK_IGNORE_MATRIX_IMAGE_FILTER_FIX
if (kReverse_MapDirection == dir && kNone_SkFilterQuality != fFilterQuality) {
// When filtering we might need some pixels in the source that might be otherwise
// clipped off.
result.outset(1, 1);
}
#endif
return result;
}
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