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/*
* 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 "SkImageSource.h"
#include "SkCanvas.h"
#include "SkColorSpaceXformer.h"
#include "SkImage.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
#include "SkString.h"
sk_sp<SkImageFilter> SkImageSource::Make(sk_sp<SkImage> image) {
if (!image) {
return nullptr;
}
return sk_sp<SkImageFilter>(new SkImageSource(std::move(image)));
}
sk_sp<SkImageFilter> SkImageSource::Make(sk_sp<SkImage> image,
const SkRect& srcRect,
const SkRect& dstRect,
SkFilterQuality filterQuality) {
if (!image || srcRect.width() <= 0.0f || srcRect.height() <= 0.0f) {
return nullptr;
}
return sk_sp<SkImageFilter>(new SkImageSource(std::move(image),
srcRect, dstRect,
filterQuality));
}
SkImageSource::SkImageSource(sk_sp<SkImage> image)
: INHERITED(nullptr, 0, nullptr)
, fImage(std::move(image))
, fSrcRect(SkRect::MakeIWH(fImage->width(), fImage->height()))
, fDstRect(fSrcRect)
, fFilterQuality(kHigh_SkFilterQuality) {
}
SkImageSource::SkImageSource(sk_sp<SkImage> image,
const SkRect& srcRect,
const SkRect& dstRect,
SkFilterQuality filterQuality)
: INHERITED(nullptr, 0, nullptr)
, fImage(std::move(image))
, fSrcRect(srcRect)
, fDstRect(dstRect)
, fFilterQuality(filterQuality) {
}
sk_sp<SkFlattenable> SkImageSource::CreateProc(SkReadBuffer& buffer) {
SkFilterQuality filterQuality = (SkFilterQuality)buffer.readInt();
SkRect src, dst;
buffer.readRect(&src);
buffer.readRect(&dst);
sk_sp<SkImage> image(buffer.readImage());
if (!image) {
return nullptr;
}
return SkImageSource::Make(std::move(image), src, dst, filterQuality);
}
void SkImageSource::flatten(SkWriteBuffer& buffer) const {
buffer.writeInt(fFilterQuality);
buffer.writeRect(fSrcRect);
buffer.writeRect(fDstRect);
buffer.writeImage(fImage.get());
}
sk_sp<SkSpecialImage> SkImageSource::onFilterImage(SkSpecialImage* source, const Context& ctx,
SkIPoint* offset) const {
SkRect dstRect;
ctx.ctm().mapRect(&dstRect, fDstRect);
SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height());
if (fSrcRect == bounds) {
int iLeft = dstRect.fLeft;
int iTop = dstRect.fTop;
// TODO: this seems to be a very noise-prone way to determine this (esp. the floating-point
// widths & heights).
if (dstRect.width() == bounds.width() && dstRect.height() == bounds.height() &&
iLeft == dstRect.fLeft && iTop == dstRect.fTop) {
// The dest is just an un-scaled integer translation of the entire image; return it
offset->fX = iLeft;
offset->fY = iTop;
return SkSpecialImage::MakeFromImage(SkIRect::MakeWH(fImage->width(), fImage->height()),
fImage, ctx.outputProperties().colorSpace(),
&source->props());
}
}
const SkIRect dstIRect = dstRect.roundOut();
sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), dstIRect.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
// TODO: it seems like this clear shouldn't be necessary (see skbug.com/5075)
canvas->clear(0x0);
SkPaint paint;
// Subtract off the integer component of the translation (will be applied in offset, below).
dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
paint.setBlendMode(SkBlendMode::kSrc);
// FIXME: this probably shouldn't be necessary, but drawImageRect asserts
// None filtering when it's translate-only
paint.setFilterQuality(
fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
kNone_SkFilterQuality : fFilterQuality);
canvas->drawImageRect(fImage.get(), fSrcRect, dstRect, &paint,
SkCanvas::kStrict_SrcRectConstraint);
offset->fX = dstIRect.fLeft;
offset->fY = dstIRect.fTop;
return surf->makeImageSnapshot();
}
sk_sp<SkImageFilter> SkImageSource::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkASSERT(0 == this->countInputs());
auto image = xformer->apply(fImage.get());
if (image != fImage) {
return SkImageSource::Make(image, fSrcRect, fDstRect, fFilterQuality);
}
return this->refMe();
}
SkRect SkImageSource::computeFastBounds(const SkRect& src) const {
return fDstRect;
}
SkIRect SkImageSource::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection direction, const SkIRect* inputRect) const {
if (kReverse_MapDirection == direction) {
return SkImageFilter::onFilterNodeBounds(src, ctm, direction, inputRect);
}
SkRect dstRect = fDstRect;
ctm.mapRect(&dstRect);
return dstRect.roundOut();
}
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