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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 "SkImage.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
#include "SkString.h"
SkImageFilter* SkImageSource::Create(SkImage* image) {
return image ? new SkImageSource(image) : nullptr;
}
SkImageFilter* SkImageSource::Create(SkImage* image,
const SkRect& srcRect,
const SkRect& dstRect,
SkFilterQuality filterQuality) {
return image ? new SkImageSource(image, srcRect, dstRect, filterQuality) : nullptr;
}
SkImageSource::SkImageSource(SkImage* image)
: INHERITED(0, nullptr)
, fImage(SkRef(image))
, fSrcRect(SkRect::MakeIWH(image->width(), image->height()))
, fDstRect(fSrcRect)
, fFilterQuality(kHigh_SkFilterQuality) { }
SkImageSource::SkImageSource(SkImage* image,
const SkRect& srcRect,
const SkRect& dstRect,
SkFilterQuality filterQuality)
: INHERITED(0, nullptr)
, fImage(SkRef(image))
, fSrcRect(srcRect)
, fDstRect(dstRect)
, fFilterQuality(filterQuality) { }
SkFlattenable* SkImageSource::CreateProc(SkReadBuffer& buffer) {
SkFilterQuality filterQuality = (SkFilterQuality)buffer.readInt();
SkRect src, dst;
buffer.readRect(&src);
buffer.readRect(&dst);
SkAutoTUnref<SkImage> image(buffer.readImage());
if (!image) {
return nullptr;
}
return SkImageSource::Create(image, src, dst, filterQuality);
}
void SkImageSource::flatten(SkWriteBuffer& buffer) const {
buffer.writeInt(fFilterQuality);
buffer.writeRect(fSrcRect);
buffer.writeRect(fDstRect);
buffer.writeImage(fImage.get());
}
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 && dstRect == bounds) {
// No regions cropped out or resized; return entire image.
offset->fX = offset->fY = 0;
return SkSpecialImage::MakeFromImage(source->internal_getProxy(),
SkIRect::MakeWH(fImage->width(), fImage->height()),
fImage).release();
}
const SkIRect dstIRect = dstRect.roundOut();
const SkImageInfo info = SkImageInfo::MakeN32(dstIRect.width(), dstIRect.height(),
kPremul_SkAlphaType);
sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
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.setXfermodeMode(SkXfermode::kSrc_Mode);
// 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().release();
}
void SkImageSource::computeFastBounds(const SkRect& src, SkRect* dst) const {
*dst = fDstRect;
}
#ifndef SK_IGNORE_TO_STRING
void SkImageSource::toString(SkString* str) const {
str->appendf("SkImageSource: (");
str->appendf("src: (%f,%f,%f,%f) dst: (%f,%f,%f,%f) ",
fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom,
fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
str->appendf("image: (%d,%d)",
fImage->width(), fImage->height());
str->append(")");
}
#endif
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