1 /*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkMatrixImageFilter.h"
9
10 #include "SkCanvas.h"
11 #include "SkColorSpaceXformer.h"
12 #include "SkImageFilterPriv.h"
13 #include "SkReadBuffer.h"
14 #include "SkSpecialImage.h"
15 #include "SkSpecialSurface.h"
16 #include "SkWriteBuffer.h"
17 #include "SkRect.h"
18
SkMatrixImageFilter(const SkMatrix & transform,SkFilterQuality filterQuality,sk_sp<SkImageFilter> input)19 SkMatrixImageFilter::SkMatrixImageFilter(const SkMatrix& transform,
20 SkFilterQuality filterQuality,
21 sk_sp<SkImageFilter> input)
22 : INHERITED(&input, 1, nullptr)
23 , fTransform(transform)
24 , fFilterQuality(filterQuality) {
25 }
26
Make(const SkMatrix & transform,SkFilterQuality filterQuality,sk_sp<SkImageFilter> input)27 sk_sp<SkImageFilter> SkMatrixImageFilter::Make(const SkMatrix& transform,
28 SkFilterQuality filterQuality,
29 sk_sp<SkImageFilter> input) {
30 return sk_sp<SkImageFilter>(new SkMatrixImageFilter(transform,
31 filterQuality,
32 std::move(input)));
33 }
34
CreateProc(SkReadBuffer & buffer)35 sk_sp<SkFlattenable> SkMatrixImageFilter::CreateProc(SkReadBuffer& buffer) {
36 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
37 SkMatrix matrix;
38 buffer.readMatrix(&matrix);
39
40 return Make(matrix, buffer.read32LE(kLast_SkFilterQuality), common.getInput(0));
41 }
42
flatten(SkWriteBuffer & buffer) const43 void SkMatrixImageFilter::flatten(SkWriteBuffer& buffer) const {
44 this->INHERITED::flatten(buffer);
45 buffer.writeMatrix(fTransform);
46 buffer.writeInt(fFilterQuality);
47 }
48
onFilterImage(SkSpecialImage * source,const Context & ctx,SkIPoint * offset) const49 sk_sp<SkSpecialImage> SkMatrixImageFilter::onFilterImage(SkSpecialImage* source,
50 const Context& ctx,
51 SkIPoint* offset) const {
52
53 SkIPoint inputOffset = SkIPoint::Make(0, 0);
54 sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
55 if (!input) {
56 return nullptr;
57 }
58
59 SkMatrix matrix;
60 if (!ctx.ctm().invert(&matrix)) {
61 return nullptr;
62 }
63 matrix.postConcat(fTransform);
64 matrix.postConcat(ctx.ctm());
65
66 const SkIRect srcBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
67 input->width(), input->height());
68 const SkRect srcRect = SkRect::Make(srcBounds);
69
70 SkRect dstRect;
71 matrix.mapRect(&dstRect, srcRect);
72 SkIRect dstBounds;
73 dstRect.roundOut(&dstBounds);
74
75 sk_sp<SkSpecialSurface> surf(input->makeSurface(ctx.outputProperties(), dstBounds.size()));
76 if (!surf) {
77 return nullptr;
78 }
79
80 SkCanvas* canvas = surf->getCanvas();
81 SkASSERT(canvas);
82
83 canvas->clear(0x0);
84
85 canvas->translate(-SkIntToScalar(dstBounds.x()), -SkIntToScalar(dstBounds.y()));
86 canvas->concat(matrix);
87
88 SkPaint paint;
89 paint.setAntiAlias(true);
90 paint.setBlendMode(SkBlendMode::kSrc);
91 paint.setFilterQuality(fFilterQuality);
92
93 input->draw(canvas, srcRect.x(), srcRect.y(), &paint);
94
95 offset->fX = dstBounds.fLeft;
96 offset->fY = dstBounds.fTop;
97 return surf->makeImageSnapshot();
98 }
99
onMakeColorSpace(SkColorSpaceXformer * xformer) const100 sk_sp<SkImageFilter> SkMatrixImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
101 SkASSERT(1 == this->countInputs());
102 auto input = xformer->apply(this->getInput(0));
103 if (input.get() != this->getInput(0)) {
104 return SkMatrixImageFilter::Make(fTransform, fFilterQuality, std::move(input));
105 }
106 return this->refMe();
107 }
108
computeFastBounds(const SkRect & src) const109 SkRect SkMatrixImageFilter::computeFastBounds(const SkRect& src) const {
110 SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
111 SkRect dst;
112 fTransform.mapRect(&dst, bounds);
113 return dst;
114 }
115
onFilterNodeBounds(const SkIRect & src,const SkMatrix & ctm,MapDirection direction) const116 SkIRect SkMatrixImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
117 MapDirection direction) const {
118 SkMatrix matrix;
119 if (!ctm.invert(&matrix)) {
120 return src;
121 }
122 if (kForward_MapDirection == direction) {
123 matrix.postConcat(fTransform);
124 } else {
125 SkMatrix transformInverse;
126 if (!fTransform.invert(&transformInverse)) {
127 return src;
128 }
129 matrix.postConcat(transformInverse);
130 }
131 matrix.postConcat(ctm);
132 SkRect floatBounds;
133 matrix.mapRect(&floatBounds, SkRect::Make(src));
134 return floatBounds.roundOut();
135 }
136
137 #ifndef SK_IGNORE_TO_STRING
toString(SkString * str) const138 void SkMatrixImageFilter::toString(SkString* str) const {
139 str->appendf("SkMatrixImageFilter: (");
140
141 str->appendf("transform: (%f %f %f %f %f %f %f %f %f)",
142 fTransform[SkMatrix::kMScaleX],
143 fTransform[SkMatrix::kMSkewX],
144 fTransform[SkMatrix::kMTransX],
145 fTransform[SkMatrix::kMSkewY],
146 fTransform[SkMatrix::kMScaleY],
147 fTransform[SkMatrix::kMTransY],
148 fTransform[SkMatrix::kMPersp0],
149 fTransform[SkMatrix::kMPersp1],
150 fTransform[SkMatrix::kMPersp2]);
151
152 str->append("<dt>FilterLevel:</dt><dd>");
153 static const char* gFilterLevelStrings[] = { "None", "Low", "Medium", "High" };
154 str->append(gFilterLevelStrings[fFilterQuality]);
155 str->append("</dd>");
156
157 str->appendf(")");
158 }
159 #endif
160