pass dst-rect through from drawBitmapRect for better precision

src/core/SkBitmapDevice.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 "SkBitmapDevice.h"
 #include "SkConfig8888.h"
 #include "SkDeviceProperties.h"
@@ skipping 200 matching lines @@
 
 void SkBitmapDevice::drawPath(const SkDraw& draw, const SkPath& path,
                               const SkPaint& paint, const SkMatrix* prePathMatrix,
                               bool pathIsMutable) {
     CHECK_FOR_ANNOTATION(paint);
     draw.drawPath(path, paint, prePathMatrix, pathIsMutable);
 }
 
 void SkBitmapDevice::drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
                                 const SkMatrix& matrix, const SkPaint& paint) {
-    draw.drawBitmap(bitmap, matrix, paint);
+    draw.drawBitmap(bitmap, matrix, NULL, paint);
 }
 
 void SkBitmapDevice::drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                     const SkRect* src, const SkRect& dst,
                                     const SkPaint& paint,
                                     SkCanvas::DrawBitmapRectFlags flags) {
     SkMatrix    matrix;
     SkRect      bitmapBounds, tmpSrc, tmpDst;
     SkBitmap    tmpBitmap;
 
@@ skipping 52 matching lines @@
         extractedBitmapBounds.isetWH(bitmapPtr->width(), bitmapPtr->height());
         if (extractedBitmapBounds == tmpSrc) {
             // no fractional part in src, we can just call drawBitmap
             goto USE_DRAWBITMAP;
         }
     } else {
         USE_DRAWBITMAP:
         // We can go faster by just calling drawBitmap, which will concat the
         // matrix with the CTM, and try to call drawSprite if it can. If not,
         // it will make a shader and call drawRect, as we do below.
-        this->drawBitmap(draw, *bitmapPtr, matrix, paint);
+        draw.drawBitmap(*bitmapPtr, matrix, dstPtr, paint);
         return;
     }
 
     // construct a shader, so we can call drawRect with the dst
     SkShader* s = SkShader::CreateBitmapShader(*bitmapPtr,
                                                SkShader::kClamp_TileMode,
                                                SkShader::kClamp_TileMode,
                                                &matrix);
     if (NULL == s) {
         return;
@@ skipping 78 matching lines @@
         paint.getRasterizer() ||
         paint.getPathEffect() ||
         paint.isFakeBoldText() ||
         paint.getStyle() != SkPaint::kFill_Style ||
         !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode))
     {
         return true;
     }
     return false;
 }