Implement support for a Context parameter in image filters

src/effects/SkMatrixConvolutionImageFilter.cpp

 /*
  * Copyright 2012 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 "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 233 matching lines @@
         uint32_t* dstRow = result.getAddr32(0, y);
         for (int x = 0; x < src.width(); ++x) {
             dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
         }
     }
     return result;
 }
 
 bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
                                                    const SkBitmap& source,
-                                                   const SkMatrix& matrix,
+                                                   const Context& ctx,
                                                    SkBitmap* result,
                                                    SkIPoint* offset) const {
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, &srcOffset)) {
+    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
         return false;
     }
 
     if (src.colorType() != kPMColor_SkColorType) {
         return false;
     }
 
     SkIRect bounds;
     src.getBounds(&bounds);
     bounds.offset(srcOffset);
-    if (!this->applyCropRect(&bounds, matrix)) {
+    if (!this->applyCropRect(&bounds, ctx.ctm())) {
         return false;
     }
 
     if (!fConvolveAlpha && !src.isOpaque()) {
         src = unpremultiplyBitmap(src);
     }
 
     SkAutoLockPixels alp(src);
     if (!src.getPixels()) {
         return false;
@@ skipping 383 matching lines @@
                                                 fBias,
                                                 fKernelOffset,
                                                 fTileMode,
                                                 fConvolveAlpha);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif