1 /*
2 * Copyright 2013 Google Inc.
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 "SkTileImageFilter.h"
9 #include "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkFlattenableBuffers.h"
13 #include "SkMatrix.h"
14 #include "SkPaint.h"
15 #include "SkShader.h"
16 #include "SkValidationUtils.h"
17
onFilterImage(Proxy * proxy,const SkBitmap & src,const SkMatrix & ctm,SkBitmap * dst,SkIPoint * offset)18 bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
19 SkBitmap* dst, SkIPoint* offset) {
20 SkBitmap source = src;
21 SkImageFilter* input = getInput(0);
22 SkIPoint localOffset = SkIPoint::Make(0, 0);
23 if (input && !input->filterImage(proxy, src, ctm, &source, &localOffset)) {
24 return false;
25 }
26
27 SkRect dstRect;
28 ctm.mapRect(&dstRect, fDstRect);
29 int w = SkScalarCeilToInt(dstRect.width());
30 int h = SkScalarCeilToInt(dstRect.height());
31 if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
32 return false;
33 }
34
35 SkRect srcRect;
36 ctm.mapRect(&srcRect, fSrcRect);
37 SkIRect srcIRect;
38 srcRect.roundOut(&srcIRect);
39 SkBitmap subset;
40 SkIRect bounds;
41 source.getBounds(&bounds);
42 if (!srcIRect.intersect(bounds)) {
43 return true;
44 } else if (!source.extractSubset(&subset, srcIRect)) {
45 return false;
46 }
47
48 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
49 if (NULL == device.get()) {
50 return false;
51 }
52 SkCanvas canvas(device);
53 SkPaint paint;
54 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
55
56 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset,
57 SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
58 paint.setShader(shader);
59 dstRect.offset(SkIntToScalar(localOffset.fX), SkIntToScalar(localOffset.fY));
60 canvas.drawRect(dstRect, paint);
61 *dst = device->accessBitmap(false);
62 return true;
63 }
64
SkTileImageFilter(SkFlattenableReadBuffer & buffer)65 SkTileImageFilter::SkTileImageFilter(SkFlattenableReadBuffer& buffer)
66 : INHERITED(1, buffer) {
67 buffer.readRect(&fSrcRect);
68 buffer.readRect(&fDstRect);
69 buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
70 }
71
flatten(SkFlattenableWriteBuffer & buffer) const72 void SkTileImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
73 this->INHERITED::flatten(buffer);
74 buffer.writeRect(fSrcRect);
75 buffer.writeRect(fDstRect);
76 }
77