/*
|
* 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);
|
}
|
