Implement support for a Context parameter in image filters

src/effects/SkTileImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTileImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 #include "SkValidationUtils.h"
 
-bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
+bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkImageFilter::Context& ctx,
                                       SkBitmap* dst, SkIPoint* offset) const {
     SkBitmap source = src;
     SkImageFilter* input = getInput(0);
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (input && !input->filterImage(proxy, src, ctm, &source, &srcOffset)) {
+    if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
         return false;
     }
 
     SkRect dstRect;
-    ctm.mapRect(&dstRect, fDstRect);
+    ctx.ctm().mapRect(&dstRect, fDstRect);
     SkIRect dstIRect;
     dstRect.roundOut(&dstIRect);
     int w = dstIRect.width();
     int h = dstIRect.height();
     if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
         return false;
     }
 
     SkRect srcRect;
-    ctm.mapRect(&srcRect, fSrcRect);
+    ctx.ctm().mapRect(&srcRect, fSrcRect);
     SkIRect srcIRect;
     srcRect.roundOut(&srcIRect);
     srcIRect.offset(-srcOffset);
     SkBitmap subset;
     SkIRect bounds;
     source.getBounds(&bounds);
 
     if (!srcIRect.intersect(bounds)) {
         offset->fX = offset->fY = 0;
         return true;
@@ skipping 29 matching lines @@
     buffer.readRect(&fSrcRect);
     buffer.readRect(&fDstRect);
     buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
 }
 
 void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeRect(fSrcRect);
     buffer.writeRect(fDstRect);
 }