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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 "SkTileImageFilter.h"
#include "SkColorSpaceXformer.h"
#include "SkCanvas.h"
#include "SkFlattenablePriv.h"
#include "SkImage.h"
#include "SkImageFilterPriv.h"
#include "SkMatrix.h"
#include "SkOffsetImageFilter.h"
#include "SkPaint.h"
#include "SkReadBuffer.h"
#include "SkShader.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkSurface.h"
#include "SkValidationUtils.h"
#include "SkWriteBuffer.h"
sk_sp<SkImageFilter> SkTileImageFilter::Make(const SkRect& srcRect, const SkRect& dstRect,
sk_sp<SkImageFilter> input) {
if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
return nullptr;
}
if (srcRect.width() == dstRect.width() && srcRect.height() == dstRect.height()) {
SkRect ir = dstRect;
if (!ir.intersect(srcRect)) {
return input;
}
CropRect cropRect(ir);
return SkOffsetImageFilter::Make(dstRect.x() - srcRect.x(),
dstRect.y() - srcRect.y(),
std::move(input),
&cropRect);
}
return sk_sp<SkImageFilter>(new SkTileImageFilter(srcRect, dstRect, std::move(input)));
}
sk_sp<SkSpecialImage> SkTileImageFilter::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;
}
SkRect dstRect;
ctx.ctm().mapRect(&dstRect, fDstRect);
if (!dstRect.intersect(SkRect::Make(ctx.clipBounds()))) {
return nullptr;
}
const SkIRect dstIRect = dstRect.roundOut();
if (!fSrcRect.width() || !fSrcRect.height() || !dstIRect.width() || !dstIRect.height()) {
return nullptr;
}
SkRect srcRect;
ctx.ctm().mapRect(&srcRect, fSrcRect);
SkIRect srcIRect;
srcRect.roundOut(&srcIRect);
srcIRect.offset(-inputOffset);
const SkIRect inputBounds = SkIRect::MakeWH(input->width(), input->height());
if (!SkIRect::Intersects(srcIRect, inputBounds)) {
return nullptr;
}
// We create an SkImage here b.c. it needs to be a tight fit for the tiling
sk_sp<SkImage> subset;
if (inputBounds.contains(srcIRect)) {
subset = input->asImage(&srcIRect);
} else {
sk_sp<SkSurface> surf(input->makeTightSurface(ctx.outputProperties(), srcIRect.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
input->draw(canvas,
SkIntToScalar(inputOffset.x()), SkIntToScalar(inputOffset.y()),
&paint);
subset = surf->makeImageSnapshot();
}
if (!subset) {
return nullptr;
}
SkASSERT(subset->width() == srcIRect.width());
SkASSERT(subset->height() == srcIRect.height());
sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), dstIRect.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setShader(subset->makeShader(SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
canvas->translate(-dstRect.fLeft, -dstRect.fTop);
canvas->drawRect(dstRect, paint);
offset->fX = dstIRect.fLeft;
offset->fY = dstIRect.fTop;
return surf->makeImageSnapshot();
}
sk_sp<SkImageFilter> SkTileImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkASSERT(1 == this->countInputs());
auto input = xformer->apply(this->getInput(0));
if (input.get() != this->getInput(0)) {
return SkTileImageFilter::Make(fSrcRect, fDstRect, std::move(input));
}
return this->refMe();
}
SkIRect SkTileImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection dir, const SkIRect* inputRect) const {
SkRect rect = kReverse_MapDirection == dir ? fSrcRect : fDstRect;
ctm.mapRect(&rect);
return rect.roundOut();
}
SkIRect SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix&,
MapDirection, const SkIRect* inputRect) const {
// Don't recurse into inputs.
return src;
}
SkRect SkTileImageFilter::computeFastBounds(const SkRect& src) const {
return fDstRect;
}
sk_sp<SkFlattenable> SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkRect src, dst;
buffer.readRect(&src);
buffer.readRect(&dst);
return Make(src, dst, common.getInput(0));
}
void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeRect(fSrcRect);
buffer.writeRect(fDstRect);
}
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