misc fixes to make float buffers work a little better

src/core/SkConfig8888.cpp

Index: src/core/SkConfig8888.cpp
diff --git a/src/core/SkConfig8888.cpp b/src/core/SkConfig8888.cpp
index 53f35c37374666fbc92e146846b374c708aef234..e2dd1020deaef9b322eb40b93780442210622a5f 100644
--- a/src/core/SkConfig8888.cpp
+++ b/src/core/SkConfig8888.cpp
@@ -173,9 +173,20 @@ bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t
     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()) {