blob: 8a7de697f36e8cfac22bb5b1445af17723e2fbaa [file] [log] [blame]
/*
* 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 "include/effects/SkOffsetImageFilter.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "src/core/SkImageFilter_Base.h"
#include "src/core/SkPointPriv.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkSpecialImage.h"
#include "src/core/SkSpecialSurface.h"
#include "src/core/SkWriteBuffer.h"
namespace {
class SkOffsetImageFilterImpl final : public SkImageFilter_Base {
public:
SkOffsetImageFilterImpl(SkScalar dx, SkScalar dy, sk_sp<SkImageFilter> input,
const CropRect* cropRect)
: INHERITED(&input, 1, cropRect) {
fOffset.set(dx, dy);
}
SkRect computeFastBounds(const SkRect& src) const override;
protected:
void flatten(SkWriteBuffer&) const override;
sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override;
SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix& ctm,
MapDirection, const SkIRect* inputRect) const override;
private:
friend void SkOffsetImageFilter::RegisterFlattenables();
SK_FLATTENABLE_HOOKS(SkOffsetImageFilterImpl)
SkVector fOffset;
typedef SkImageFilter_Base INHERITED;
};
} // end namespace
sk_sp<SkImageFilter> SkOffsetImageFilter::Make(SkScalar dx, SkScalar dy,
sk_sp<SkImageFilter> input,
const SkImageFilter::CropRect* cropRect) {
if (!SkScalarIsFinite(dx) || !SkScalarIsFinite(dy)) {
return nullptr;
}
return sk_sp<SkImageFilter>(new SkOffsetImageFilterImpl(dx, dy, std::move(input), cropRect));
}
void SkOffsetImageFilter::RegisterFlattenables() {
SK_REGISTER_FLATTENABLE(SkOffsetImageFilterImpl);
// TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name
SkFlattenable::Register("SkOffsetImageFilter", SkOffsetImageFilterImpl::CreateProc);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
sk_sp<SkFlattenable> SkOffsetImageFilterImpl::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkPoint offset;
buffer.readPoint(&offset);
return SkOffsetImageFilter::Make(offset.x(), offset.y(), common.getInput(0),
&common.cropRect());
}
void SkOffsetImageFilterImpl::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fOffset);
}
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<SkSpecialImage> SkOffsetImageFilterImpl::onFilterImage(const Context& ctx,
SkIPoint* offset) const {
SkIPoint srcOffset = SkIPoint::Make(0, 0);
sk_sp<SkSpecialImage> input(this->filterInput(0, 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(ctx.makeSurface(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();
}
}
SkRect SkOffsetImageFilterImpl::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 SkOffsetImageFilterImpl::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);
}