Implement support for a Context parameter in image filters

src/effects/SkXfermodeImageFilter.cpp

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermodeImageFilter.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
@@ skipping 26 matching lines @@
     fMode = buffer.readXfermode();
 }
 
 void SkXfermodeImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeFlattenable(fMode);
 }
 
 bool SkXfermodeImageFilter::onFilterImage(Proxy* proxy,
                                             const SkBitmap& src,
-                                            const SkMatrix& ctm,
+                                            const Context& ctx,
                                             SkBitmap* dst,
                                             SkIPoint* offset) const {
     SkBitmap background = src, foreground = src;
     SkImageFilter* backgroundInput = getInput(0);
     SkImageFilter* foregroundInput = getInput(1);
     SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
     if (backgroundInput &&
-        !backgroundInput->filterImage(proxy, src, ctm, &background, &backgroundOffset)) {
+        !backgroundInput->filterImage(proxy, src, ctx, &background, &backgroundOffset)) {
         return false;
     }
     SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
     if (foregroundInput &&
-        !foregroundInput->filterImage(proxy, src, ctm, &foreground, &foregroundOffset)) {
+        !foregroundInput->filterImage(proxy, src, ctx, &foreground, &foregroundOffset)) {
         return false;
     }
 
     SkIRect bounds, foregroundBounds;
     background.getBounds(&bounds);
     bounds.offset(backgroundOffset);
     foreground.getBounds(&foregroundBounds);
     foregroundBounds.offset(foregroundOffset);
     bounds.join(foregroundBounds);
-    if (!applyCropRect(&bounds, ctm)) {
+    if (!applyCropRect(&bounds, ctx.ctm())) {
         return false;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
     if (NULL == device.get()) {
         return false;
     }
     SkCanvas canvas(device);
     canvas.translate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
     SkPaint paint;
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     canvas.drawBitmap(background, SkIntToScalar(backgroundOffset.fX),
                       SkIntToScalar(backgroundOffset.fY), &paint);
     paint.setXfermode(fMode);
     canvas.drawBitmap(foreground, SkIntToScalar(foregroundOffset.fX),
                       SkIntToScalar(foregroundOffset.fY), &paint);
     canvas.clipRect(SkRect::Make(foregroundBounds), SkRegion::kDifference_Op);
     paint.setColor(SK_ColorTRANSPARENT);
     canvas.drawPaint(paint);
     *dst = device->accessBitmap(false);
     offset->fX = bounds.left();
     offset->fY = bounds.top();
     return true;
 }
 
 #if SK_SUPPORT_GPU
 
 bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
                                            const SkBitmap& src,
-                                           const SkMatrix& ctm,
+                                           const Context& ctx,
                                            SkBitmap* result,
                                            SkIPoint* offset) const {
     SkBitmap background = src;
     SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
-    if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctm, &background,
+    if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &background,
                                                        &backgroundOffset)) {
         return false;
     }
     GrTexture* backgroundTex = background.getTexture();
     SkBitmap foreground = src;
     SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
-    if (getInput(1) && !getInput(1)->getInputResultGPU(proxy, src, ctm, &foreground,
+    if (getInput(1) && !getInput(1)->getInputResultGPU(proxy, src, ctx, &foreground,
                                                        &foregroundOffset)) {
         return false;
     }
     GrTexture* foregroundTex = foreground.getTexture();
     GrContext* context = foregroundTex->getContext();
 
     GrEffectRef* xferEffect = NULL;
 
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
@@ skipping 34 matching lines @@
         foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
         context->drawRect(foregroundPaint, srcRect);
     }
     offset->fX = backgroundOffset.fX;
     offset->fY = backgroundOffset.fY;
     WrapTexture(dst, src.width(), src.height(), result);
     return true;
 }
 
 #endif