misc fixes to make float buffers work a little better

src/core/SkConfig8888.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkConfig8888.h"
@@ skipping 155 matching lines @@
         dst8 += dstRB;
     }
 }
 
 bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
                              const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
                              SkColorTable* ctable) {
     if (srcInfo.dimensions() != dstInfo.dimensions()) {
         return false;
     }
-
+    
     const int width = srcInfo.width();
     const int height = srcInfo.height();
+    
+    // Do the easiest one first : both configs are equal
+    if ((srcInfo == dstInfo) && !ctable) {
+        size_t bytes = width * srcInfo.bytesPerPixel();
+        for (int y = 0; y < height; ++y) {
+            memcpy(dstPixels, srcPixels, bytes);
+            srcPixels = (const char*)srcPixels + srcRB;
+            dstPixels = (char*)dstPixels + dstRB;
+        }
+        return true;
+    }
 
     // Handle fancy alpha swizzling if both are ARGB32
     if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) {
         SkDstPixelInfo dstPI;
         dstPI.fColorType = dstInfo.colorType();
         dstPI.fAlphaType = dstInfo.alphaType();
         dstPI.fPixels = dstPixels;
         dstPI.fRowBytes = dstRB;
 
         SkSrcPixelInfo srcPI;
@@ skipping 97 matching lines @@
 
         SkPaint  paint;
         paint.setDither(true);
 
         canvas->clear(0);
         canvas->drawBitmap(bm, 0, 0, &paint);
         return true;
     }
 }