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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 "include/core/SkCanvas.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/effects/SkOffsetImageFilter.h"
- #include "src/core/SkImageFilterPriv.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"
- 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();
- }
- }
- 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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