2 * Copyright 2014 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #include "SkMatrixImageFilter.h"
11 #include "SkReadBuffer.h"
12 #include "SkSpecialImage.h"
13 #include "SkSpecialSurface.h"
14 #include "SkWriteBuffer.h"
17 SkMatrixImageFilter::SkMatrixImageFilter(const SkMatrix& transform,
18 SkFilterQuality filterQuality,
19 sk_sp<SkImageFilter> input)
20 : INHERITED(&input, 1, nullptr)
21 , fTransform(transform)
22 , fFilterQuality(filterQuality) {
25 sk_sp<SkImageFilter> SkMatrixImageFilter::Make(const SkMatrix& transform,
26 SkFilterQuality filterQuality,
27 sk_sp<SkImageFilter> input) {
28 return sk_sp<SkImageFilter>(new SkMatrixImageFilter(transform,
33 sk_sp<SkFlattenable> SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
34 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
36 buffer.readMatrix(&matrix);
37 SkFilterQuality quality = static_cast<SkFilterQuality>(buffer.readInt());
38 return Make(matrix, quality, common.getInput(0));
41 void SkMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
42 this->INHERITED::flatten(buffer);
43 buffer.writeMatrix(fTransform);
44 buffer.writeInt(fFilterQuality);
47 sk_sp<SkSpecialImage> SkMatrixImageFilter::onFilterImage(SkSpecialImage* source,
49 SkIPoint* offset) const {
51 SkIPoint inputOffset = SkIPoint::Make(0, 0);
52 sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
58 if (!ctx.ctm().invert(&matrix)) {
61 matrix.postConcat(fTransform);
62 matrix.postConcat(ctx.ctm());
64 const SkIRect srcBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
65 input->width(), input->height());
66 const SkRect srcRect = SkRect::Make(srcBounds);
69 matrix.mapRect(&dstRect, srcRect);
71 dstRect.roundOut(&dstBounds);
73 sk_sp<SkSpecialSurface> surf(input->makeSurface(ctx.outputProperties(), dstBounds.size()));
78 SkCanvas* canvas = surf->getCanvas();
83 canvas->translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y()));
84 canvas->concat(matrix);
87 paint.setAntiAlias(true);
88 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
89 paint.setFilterQuality(fFilterQuality);
91 input->draw(canvas, srcRect.x(), srcRect.y(), &paint);
93 offset->fX = dstBounds.fLeft;
94 offset->fY = dstBounds.fTop;
95 return surf->makeImageSnapshot();
98 SkRect SkMatrixImageFilter::computeFastBounds(const SkRect& src) const {
99 SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
101 fTransform.mapRect(&dst, bounds);
105 SkIRect SkMatrixImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
106 MapDirection direction) const {
108 if (!ctm.invert(&matrix)) {
111 if (kForward_MapDirection == direction) {
112 matrix.postConcat(fTransform);
114 SkMatrix transformInverse;
115 if (!fTransform.invert(&transformInverse)) {
118 matrix.postConcat(transformInverse);
120 matrix.postConcat(ctm);
122 matrix.mapRect(&floatBounds, SkRect::Make(src));
123 return floatBounds.roundOut();
126 #ifndef SK_IGNORE_TO_STRING
127 void SkMatrixImageFilter::toString(SkString* str) const {
128 str->appendf("SkMatrixImageFilter: (");
130 str->appendf("transform: (%f %f %f %f %f %f %f %f %f)",
131 fTransform[SkMatrix::kMScaleX],
132 fTransform[SkMatrix::kMSkewX],
133 fTransform[SkMatrix::kMTransX],
134 fTransform[SkMatrix::kMSkewY],
135 fTransform[SkMatrix::kMScaleY],
136 fTransform[SkMatrix::kMTransY],
137 fTransform[SkMatrix::kMPersp0],
138 fTransform[SkMatrix::kMPersp1],
139 fTransform[SkMatrix::kMPersp2]);
141 str->append("<dt>FilterLevel:</dt><dd>");
142 static const char* gFilterLevelStrings[] = { "None", "Low", "Medium", "High" };
143 str->append(gFilterLevelStrings[fFilterQuality]);
144 str->append("</dd>");