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 "SkXfermodeImageFilter.h"
9 #include "SkCanvas.h"
10 #include "SkDevice.h"
11 #include "SkColorPriv.h"
12 #include "SkFlattenableBuffers.h"
13 #include "SkXfermode.h"
14 #if SK_SUPPORT_GPU
15 #include "GrContext.h"
16 #include "effects/GrSimpleTextureEffect.h"
17 #include "SkGr.h"
18 #include "SkImageFilterUtils.h"
19 #endif
20
21 ///////////////////////////////////////////////////////////////////////////////
22
SkXfermodeImageFilter(SkXfermode * mode,SkImageFilter * background,SkImageFilter * foreground,const CropRect * cropRect)23 SkXfermodeImageFilter::SkXfermodeImageFilter(SkXfermode* mode,
24 SkImageFilter* background,
25 SkImageFilter* foreground,
26 const CropRect* cropRect)
27 : INHERITED(background, foreground, cropRect), fMode(mode) {
28 SkSafeRef(fMode);
29 }
30
~SkXfermodeImageFilter()31 SkXfermodeImageFilter::~SkXfermodeImageFilter() {
32 SkSafeUnref(fMode);
33 }
34
SkXfermodeImageFilter(SkFlattenableReadBuffer & buffer)35 SkXfermodeImageFilter::SkXfermodeImageFilter(SkFlattenableReadBuffer& buffer)
36 : INHERITED(2, buffer) {
37 fMode = buffer.readXfermode();
38 }
39
flatten(SkFlattenableWriteBuffer & buffer) const40 void SkXfermodeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
41 this->INHERITED::flatten(buffer);
42 buffer.writeFlattenable(fMode);
43 }
44
onFilterImage(Proxy * proxy,const SkBitmap & src,const SkMatrix & ctm,SkBitmap * dst,SkIPoint * offset)45 bool SkXfermodeImageFilter::onFilterImage(Proxy* proxy,
46 const SkBitmap& src,
47 const SkMatrix& ctm,
48 SkBitmap* dst,
49 SkIPoint* offset) {
50 SkBitmap background = src, foreground = src;
51 SkImageFilter* backgroundInput = getInput(0);
52 SkImageFilter* foregroundInput = getInput(1);
53 SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
54 if (backgroundInput &&
55 !backgroundInput->filterImage(proxy, src, ctm, &background, &backgroundOffset)) {
56 return false;
57 }
58 SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
59 if (foregroundInput &&
60 !foregroundInput->filterImage(proxy, src, ctm, &foreground, &foregroundOffset)) {
61 return false;
62 }
63
64 SkIRect bounds, foregroundBounds;
65 background.getBounds(&bounds);
66 bounds.offset(backgroundOffset);
67 foreground.getBounds(&foregroundBounds);
68 foregroundBounds.offset(foregroundOffset);
69 bounds.join(foregroundBounds);
70 if (!applyCropRect(&bounds, ctm)) {
71 return false;
72 }
73
74 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
75 if (NULL == device.get()) {
76 return false;
77 }
78 SkCanvas canvas(device);
79 canvas.translate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
80 SkPaint paint;
81 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
82 canvas.drawBitmap(background, SkIntToScalar(backgroundOffset.fX),
83 SkIntToScalar(backgroundOffset.fY), &paint);
84 paint.setXfermode(fMode);
85 canvas.drawBitmap(foreground, SkIntToScalar(foregroundOffset.fX),
86 SkIntToScalar(foregroundOffset.fY), &paint);
87 canvas.clipRect(SkRect::Make(foregroundBounds), SkRegion::kDifference_Op);
88 paint.setColor(SK_ColorTRANSPARENT);
89 canvas.drawPaint(paint);
90 *dst = device->accessBitmap(false);
91 offset->fX += bounds.left();
92 offset->fY += bounds.top();
93 return true;
94 }
95
96 #if SK_SUPPORT_GPU
97
filterImageGPU(Proxy * proxy,const SkBitmap & src,const SkMatrix & ctm,SkBitmap * result,SkIPoint * offset)98 bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
99 const SkBitmap& src,
100 const SkMatrix& ctm,
101 SkBitmap* result,
102 SkIPoint* offset) {
103 SkBitmap background;
104 SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
105 if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &background,
106 &backgroundOffset)) {
107 return false;
108 }
109 GrTexture* backgroundTex = background.getTexture();
110 SkBitmap foreground;
111 SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
112 if (!SkImageFilterUtils::GetInputResultGPU(getInput(1), proxy, src, ctm, &foreground,
113 &foregroundOffset)) {
114 return false;
115 }
116 GrTexture* foregroundTex = foreground.getTexture();
117 GrContext* context = foregroundTex->getContext();
118
119 GrEffectRef* xferEffect = NULL;
120
121 GrTextureDesc desc;
122 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
123 desc.fWidth = src.width();
124 desc.fHeight = src.height();
125 desc.fConfig = kSkia8888_GrPixelConfig;
126
127 GrAutoScratchTexture ast(context, desc);
128 SkAutoTUnref<GrTexture> dst(ast.detach());
129
130 GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
131
132 SkXfermode::Coeff sm, dm;
133 if (!SkXfermode::AsNewEffectOrCoeff(fMode, &xferEffect, &sm, &dm, backgroundTex)) {
134 return false;
135 }
136
137 SkMatrix foregroundMatrix = GrEffect::MakeDivByTextureWHMatrix(foregroundTex);
138 foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
139 SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));
140
141
142 SkRect srcRect;
143 src.getBounds(&srcRect);
144 if (NULL != xferEffect) {
145 GrPaint paint;
146 paint.addColorTextureEffect(foregroundTex, foregroundMatrix);
147 paint.addColorEffect(xferEffect)->unref();
148 context->drawRect(paint, srcRect);
149 } else {
150 GrPaint backgroundPaint;
151 SkMatrix backgroundMatrix = GrEffect::MakeDivByTextureWHMatrix(backgroundTex);
152 backgroundPaint.addColorTextureEffect(backgroundTex, backgroundMatrix);
153 context->drawRect(backgroundPaint, srcRect);
154
155 GrPaint foregroundPaint;
156 foregroundPaint.setBlendFunc(sk_blend_to_grblend(sm), sk_blend_to_grblend(dm));
157 foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
158 context->drawRect(foregroundPaint, srcRect);
159 }
160 offset->fX += backgroundOffset.fX;
161 offset->fY += backgroundOffset.fY;
162 return SkImageFilterUtils::WrapTexture(dst, src.width(), src.height(), result);
163 }
164
165 #endif
166