Make filters use SkImage instead of SkBitmap

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 "SkImage.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 #include "SkValidationUtils.h"
 
 SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
                                              SkImageFilter* input) {
     if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
         return NULL;
     }
     return SkNEW_ARGS(SkTileImageFilter, (srcRect, dstRect, input));
 }
 
-bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
+bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkImage* src,
                                       const Context& ctx,
-                                      SkBitmap* dst, SkIPoint* offset) const {
-    SkBitmap source = src;
+                                      SkAutoTUnref<const SkImage>& dst, SkIPoint* offset) const {
+    SkAutoTUnref<const SkImage> source(SkRef(src));
     SkImageFilter* input = getInput(0);
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
+    if (input && !input->filterImage(proxy, src, ctx, source, &srcOffset)) {
         return false;
     }
 
     SkRect dstRect;
     ctx.ctm().mapRect(&dstRect, fDstRect);
     const SkIRect dstIRect = dstRect.roundOut();
     int w = dstIRect.width();
     int h = dstIRect.height();
     if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
         return false;
     }
 
     SkRect srcRect;
     ctx.ctm().mapRect(&srcRect, fSrcRect);
     SkIRect srcIRect;
     srcRect.roundOut(&srcIRect);
     srcIRect.offset(-srcOffset);
-    SkBitmap subset;
-    SkIRect bounds;
-    source.getBounds(&bounds);
+    SkIRect bounds = SkIRect::MakeWH(source->width(), source->height());
 
     if (!srcIRect.intersect(bounds)) {
         offset->fX = offset->fY = 0;
         return true;
-    } else if (!source.extractSubset(&subset, srcIRect)) {
+    }
+    SkAutoTUnref<SkImage> subset(source->newImage(srcIRect.width(), srcIRect.height(), &srcIRect));
+    if (!subset) {
         return false;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
     if (NULL == device.get()) {
         return false;
     }
-    SkCanvas canvas(device);
-    SkPaint paint;
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    {
+        SkCanvas canvas(device);
+        SkPaint paint;
+        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
 
-    SkMatrix shaderMatrix;
-    shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX),
-                              SkIntToScalar(srcOffset.fY));
-    SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset,
-                                  SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
-                                  &shaderMatrix));
-    paint.setShader(shader);
-    canvas.translate(-dstRect.fLeft, -dstRect.fTop);
-    canvas.drawRect(dstRect, paint);
-    *dst = device->accessBitmap(false);
+        SkMatrix shaderMatrix;
+        shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX),
+                                  SkIntToScalar(srcOffset.fY));
+        SkAutoTUnref<SkShader> shader(subset->newShader(SkShader::kRepeat_TileMode,
+                                                        SkShader::kRepeat_TileMode, &shaderMatrix));
+
+        paint.setShader(shader);
+        subset.reset(NULL);
+        canvas.translate(-dstRect.fLeft, -dstRect.fTop);
+        canvas.drawRect(dstRect, paint);
+    }
+
+    SkImage* image = device->newImageSnapshot();
+    if (NULL == image) {
+        return false;
+    }
+    dst.reset(image);
     offset->fX = dstIRect.fLeft;
     offset->fY = dstIRect.fTop;
     return true;
 }
 
 bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
                                        SkIRect* dst) const {
     SkRect srcRect;
     ctm.mapRect(&srcRect, fSrcRect);
     SkIRect srcIRect;
@@ skipping 16 matching lines @@
     buffer.writeRect(fSrcRect);
     buffer.writeRect(fDstRect);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkTileImageFilter::toString(SkString* str) const {
     str->appendf("SkTileImageFilter: (");
     str->append(")");
 }
 #endif