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 "SkRectShaderImageFilter.h"
9 #include "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkReadBuffer.h"
13 #include "SkWriteBuffer.h"
14 #include "SkShader.h"
15
Create(SkShader * s,const SkRect & rect)16 SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const SkRect& rect) {
17 SkASSERT(s);
18 uint32_t flags = CropRect::kHasAll_CropEdge;
19 if (rect.width() == 0 || rect.height() == 0) {
20 flags = 0x0;
21 }
22 CropRect cropRect(rect, flags);
23 return SkNEW_ARGS(SkRectShaderImageFilter, (s, &cropRect));
24 }
25
Create(SkShader * s,const CropRect * cropRect,uint32_t uniqueID)26 SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const CropRect* cropRect, uint32_t uniqueID) {
27 SkASSERT(s);
28 return SkNEW_ARGS(SkRectShaderImageFilter, (s, cropRect, uniqueID));
29 }
30
SkRectShaderImageFilter(SkShader * s,const CropRect * cropRect,uint32_t uniqueID)31 SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect,
32 uint32_t uniqueID)
33 : INHERITED(0, NULL, cropRect, uniqueID)
34 , fShader(s) {
35 SkASSERT(s);
36 s->ref();
37 }
38
39 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
SkRectShaderImageFilter(SkReadBuffer & buffer)40 SkRectShaderImageFilter::SkRectShaderImageFilter(SkReadBuffer& buffer)
41 : INHERITED(0, buffer) {
42 fShader = buffer.readShader();
43 }
44 #endif
45
CreateProc(SkReadBuffer & buffer)46 SkFlattenable* SkRectShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
47 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
48 SkAutoTUnref<SkShader> shader(buffer.readShader());
49 return Create(shader.get(), &common.cropRect(), common.uniqueID());
50 }
51
flatten(SkWriteBuffer & buffer) const52 void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
53 this->INHERITED::flatten(buffer);
54 buffer.writeFlattenable(fShader);
55 }
56
~SkRectShaderImageFilter()57 SkRectShaderImageFilter::~SkRectShaderImageFilter() {
58 SkSafeUnref(fShader);
59 }
60
onFilterImage(Proxy * proxy,const SkBitmap & source,const Context & ctx,SkBitmap * result,SkIPoint * offset) const61 bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
62 const SkBitmap& source,
63 const Context& ctx,
64 SkBitmap* result,
65 SkIPoint* offset) const {
66 SkIRect bounds;
67 if (!this->applyCropRect(ctx, source, SkIPoint::Make(0, 0), &bounds)) {
68 return false;
69 }
70
71 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
72 bounds.height()));
73 if (NULL == device.get()) {
74 return false;
75 }
76 SkCanvas canvas(device.get());
77
78 SkPaint paint;
79 SkMatrix matrix(ctx.ctm());
80 matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
81 paint.setShader(SkShader::CreateLocalMatrixShader(fShader, matrix))->unref();
82
83 SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
84 canvas.drawRect(rect, paint);
85
86 *result = device.get()->accessBitmap(false);
87 offset->fX = bounds.fLeft;
88 offset->fY = bounds.fTop;
89 return true;
90 }
91