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/*
* Copyright 2012 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 "SkOffsetImageFilter.h"
#include "SkColorSpaceXformer.h"
#include "SkCanvas.h"
#include "SkImageFilterPriv.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPointPriv.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
static SkIPoint map_offset_vector(const SkMatrix& ctm, const SkVector& offset) {
SkVector vec = ctm.mapVector(offset.fX, offset.fY);
return SkIPoint::Make(SkScalarRoundToInt(vec.fX), SkScalarRoundToInt(vec.fY));
}
sk_sp<SkImageFilter> SkOffsetImageFilter::Make(SkScalar dx, SkScalar dy,
sk_sp<SkImageFilter> input,
const CropRect* cropRect) {
if (!SkScalarIsFinite(dx) || !SkScalarIsFinite(dy)) {
return nullptr;
}
return sk_sp<SkImageFilter>(new SkOffsetImageFilter(dx, dy, std::move(input), cropRect));
}
sk_sp<SkSpecialImage> SkOffsetImageFilter::onFilterImage(SkSpecialImage* source,
const Context& ctx,
SkIPoint* offset) const {
SkIPoint srcOffset = SkIPoint::Make(0, 0);
sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &srcOffset));
if (!input) {
return nullptr;
}
SkIPoint vec = map_offset_vector(ctx.ctm(), fOffset);
if (!this->cropRectIsSet()) {
offset->fX = Sk32_sat_add(srcOffset.fX, vec.fX);
offset->fY = Sk32_sat_add(srcOffset.fY, vec.fY);
return input;
} else {
SkIRect bounds;
const SkIRect srcBounds = SkIRect::MakeXYWH(srcOffset.fX, srcOffset.fY,
input->width(), input->height());
if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
return nullptr;
}
sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.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;
paint.setBlendMode(SkBlendMode::kSrc);
canvas->translate(SkIntToScalar(srcOffset.fX - bounds.fLeft),
SkIntToScalar(srcOffset.fY - bounds.fTop));
input->draw(canvas, vec.fX, vec.fY, &paint);
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return surf->makeImageSnapshot();
}
}
sk_sp<SkImageFilter> SkOffsetImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkASSERT(1 == this->countInputs());
auto input = xformer->apply(this->getInput(0));
if (input.get() != this->getInput(0)) {
return SkOffsetImageFilter::Make(fOffset.fX, fOffset.fY, std::move(input),
this->getCropRectIfSet());
}
return this->refMe();
}
SkRect SkOffsetImageFilter::computeFastBounds(const SkRect& src) const {
SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
bounds.offset(fOffset.fX, fOffset.fY);
return bounds;
}
SkIRect SkOffsetImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection dir, const SkIRect* inputRect) const {
SkIPoint vec = map_offset_vector(ctm, fOffset);
if (kReverse_MapDirection == dir) {
SkPointPriv::Negate(vec);
}
return src.makeOffset(vec.fX, vec.fY);
}
sk_sp<SkFlattenable> SkOffsetImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkPoint offset;
buffer.readPoint(&offset);
return Make(offset.x(), offset.y(), common.getInput(0), &common.cropRect());
}
void SkOffsetImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fOffset);
}
SkOffsetImageFilter::SkOffsetImageFilter(SkScalar dx, SkScalar dy,
sk_sp<SkImageFilter> input,
const CropRect* cropRect)
: INHERITED(&input, 1, cropRect) {
fOffset.set(dx, dy);
}
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