1 /*
2 * Copyright 2012 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 "SkOffsetImageFilter.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
onFilterImage(Proxy * proxy,const SkBitmap & source,const SkMatrix & matrix,SkBitmap * result,SkIPoint * loc)16 bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
17 const SkMatrix& matrix,
18 SkBitmap* result,
19 SkIPoint* loc) {
20 SkImageFilter* input = getInput(0);
21 SkBitmap src = source;
22 #ifdef SK_DISABLE_OFFSETIMAGEFILTER_OPTIMIZATION
23 if (false) {
24 #else
25 if (!cropRectIsSet()) {
26 #endif
27 if (input && !input->filterImage(proxy, source, matrix, &src, loc)) {
28 return false;
29 }
30
31 SkVector vec;
32 matrix.mapVectors(&vec, &fOffset, 1);
33
34 loc->fX += SkScalarRoundToInt(vec.fX);
35 loc->fY += SkScalarRoundToInt(vec.fY);
36 *result = src;
37 } else {
38 SkIPoint srcOffset = SkIPoint::Make(0, 0);
39 if (input && !input->filterImage(proxy, source, matrix, &src, &srcOffset)) {
40 return false;
41 }
42
43 SkIRect bounds;
44 src.getBounds(&bounds);
45
46 if (!applyCropRect(&bounds, matrix)) {
47 return false;
48 }
49
50 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
51 if (NULL == device.get()) {
52 return false;
53 }
54 SkCanvas canvas(device);
55 SkPaint paint;
56 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
57 canvas.drawBitmap(src, fOffset.fX - bounds.left(), fOffset.fY - bounds.top(), &paint);
58 *result = device->accessBitmap(false);
59 loc->fX += bounds.left();
60 loc->fY += bounds.top();
61 }
62 return true;
63 }
64
65 bool SkOffsetImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
66 SkIRect* dst) {
67 SkVector vec;
68 ctm.mapVectors(&vec, &fOffset, 1);
69
70 *dst = src;
71 dst->offset(SkScalarRoundToInt(vec.fX), SkScalarRoundToInt(vec.fY));
72 return true;
73 }
74
75 void SkOffsetImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
76 this->INHERITED::flatten(buffer);
77 buffer.writePoint(fOffset);
78 }
79
80 SkOffsetImageFilter::SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input,
81 const CropRect* cropRect) : INHERITED(input, cropRect) {
82 fOffset.set(dx, dy);
83 }
84
85 SkOffsetImageFilter::SkOffsetImageFilter(SkFlattenableReadBuffer& buffer)
86 : INHERITED(1, buffer) {
87 buffer.readPoint(&fOffset);
88 buffer.validate(SkScalarIsFinite(fOffset.fX) &&
89 SkScalarIsFinite(fOffset.fY));
90 }
91