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1 /* | |
2 * Copyright 2013 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 "SkResizeImageFilter.h" | |
9 #include "SkBitmap.h" | |
10 #include "SkCanvas.h" | |
11 #include "SkDevice.h" | |
12 #include "SkColorPriv.h" | |
13 #include "SkFlattenableBuffers.h" | |
14 #include "SkMatrix.h" | |
15 #include "SkRect.h" | |
16 | |
17 SkResizeImageFilter::SkResizeImageFilter(SkScalar sx, SkScalar sy, SkPaint::Filt
erLevel filterLevel, | |
18 SkImageFilter* input) | |
19 : INHERITED(input), | |
20 fSx(sx), | |
21 fSy(sy), | |
22 fFilterLevel(filterLevel) { | |
23 } | |
24 | |
25 SkResizeImageFilter::SkResizeImageFilter(SkFlattenableReadBuffer& buffer) | |
26 : INHERITED(1, buffer) { | |
27 fSx = buffer.readScalar(); | |
28 fSy = buffer.readScalar(); | |
29 fFilterLevel = static_cast<SkPaint::FilterLevel>(buffer.readInt()); | |
30 } | |
31 | |
32 void SkResizeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { | |
33 this->INHERITED::flatten(buffer); | |
34 buffer.writeScalar(fSx); | |
35 buffer.writeScalar(fSy); | |
36 buffer.writeInt(fFilterLevel); | |
37 } | |
38 | |
39 SkResizeImageFilter::~SkResizeImageFilter() { | |
40 } | |
41 | |
42 bool SkResizeImageFilter::onFilterImage(Proxy* proxy, | |
43 const SkBitmap& source, | |
44 const SkMatrix& matrix, | |
45 SkBitmap* result, | |
46 SkIPoint* offset) { | |
47 SkBitmap src = source; | |
48 SkIPoint srcOffset = SkIPoint::Make(0, 0); | |
49 if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, &s
rcOffset)) { | |
50 return false; | |
51 } | |
52 | |
53 SkRect dstRect; | |
54 SkIRect srcBounds, dstBounds; | |
55 src.getBounds(&srcBounds); | |
56 srcBounds.offset(srcOffset); | |
57 SkRect srcRect = SkRect::Make(srcBounds); | |
58 SkMatrix dstMatrix; | |
59 dstMatrix.setScale(fSx, fSy); | |
60 dstMatrix.mapRect(&dstRect, srcRect); | |
61 dstRect.roundOut(&dstBounds); | |
62 | |
63 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dst
Bounds.height())); | |
64 if (NULL == device.get()) { | |
65 return false; | |
66 } | |
67 | |
68 SkCanvas canvas(device.get()); | |
69 canvas.translate(-SkIntToScalar(dstBounds.fLeft), -SkIntToScalar(dstBounds.f
Top)); | |
70 SkPaint paint; | |
71 | |
72 paint.setXfermodeMode(SkXfermode::kSrc_Mode); | |
73 paint.setFilterLevel(fFilterLevel); | |
74 canvas.concat(dstMatrix); | |
75 canvas.drawBitmap(src, srcRect.left(), srcRect.top(), &paint); | |
76 | |
77 *result = device.get()->accessBitmap(false); | |
78 offset->fX = dstBounds.fLeft; | |
79 offset->fY = dstBounds.fTop; | |
80 return true; | |
81 } | |
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