Implement support for a Context parameter in image filters

src/effects/SkResizeImageFilter.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 "SkResizeImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 24 matching lines @@
     buffer.writeScalar(fSx);
     buffer.writeScalar(fSy);
     buffer.writeInt(fFilterLevel);
 }
 
 SkResizeImageFilter::~SkResizeImageFilter() {
 }
 
 bool SkResizeImageFilter::onFilterImage(Proxy* proxy,
                                          const SkBitmap& source,
-                                         const SkMatrix& ctm,
+                                         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, ctm, &src, &srcOffset)) {
+    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
         return false;
     }
 
     SkRect dstRect;
     SkIRect srcBounds, dstBounds;
     src.getBounds(&srcBounds);
     srcBounds.offset(srcOffset);
     SkRect srcRect = SkRect::Make(srcBounds);
     SkMatrix matrix;
-    if (!ctm.invert(&matrix)) {
+    if (!ctx.ctm().invert(&matrix)) {
         return false;
     }
     matrix.postScale(fSx, fSy);
-    matrix.postConcat(ctm);
+    matrix.postConcat(ctx.ctm());
     matrix.mapRect(&dstRect, srcRect);
     dstRect.roundOut(&dstBounds);
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
     if (NULL == device.get()) {
         return false;
     }
 
     SkCanvas canvas(device.get());
     canvas.scale(fSx, fSy);
@@ skipping 29 matching lines @@
     matrix.mapRect(&floatBounds, SkRect::Make(src));
     SkIRect bounds;
     floatBounds.roundOut(&bounds);
     if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) {
         return false;
     }
 
     *dst = bounds;
     return true;
 }