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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 "SkCanvas.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
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;
}
SkVector vec;
ctx.ctm().mapVectors(&vec, &fOffset, 1);
if (!this->cropRectIsSet()) {
offset->fX = srcOffset.fX + SkScalarRoundToInt(vec.fX);
offset->fY = srcOffset.fY + SkScalarRoundToInt(vec.fY);
return input;
} else {
SkIRect bounds;
SkIRect srcBounds = SkIRect::MakeWH(input->width(), input->height());
srcBounds.offset(srcOffset);
if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
return nullptr;
}
SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.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;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas->translate(SkIntToScalar(srcOffset.fX - bounds.fLeft),
SkIntToScalar(srcOffset.fY - bounds.fTop));
input->draw(canvas, vec.x(), vec.y(), &paint);
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return surf->makeImageSnapshot();
}
}
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 direction) const {
SkVector vec;
ctm.mapVectors(&vec, &fOffset, 1);
if (kReverse_MapDirection == direction) {
vec.negate();
}
return src.makeOffset(SkScalarCeilToInt(vec.fX), SkScalarCeilToInt(vec.fY));
}
SkFlattenable* SkOffsetImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkPoint offset;
buffer.readPoint(&offset);
return Create(offset.x(), offset.y(), common.getInput(0).get(), &common.cropRect());
}
void SkOffsetImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fOffset);
}
SkOffsetImageFilter::SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input,
const CropRect* cropRect)
: INHERITED(1, &input, cropRect) {
fOffset.set(dx, dy);
}
#ifndef SK_IGNORE_TO_STRING
void SkOffsetImageFilter::toString(SkString* str) const {
str->appendf("SkOffsetImageFilter: (");
str->appendf("offset: (%f, %f) ", fOffset.fX, fOffset.fY);
str->append("input: (");
if (this->getInput(0)) {
this->getInput(0)->toString(str);
}
str->append("))");
}
#endif
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