Fix the way we patch up the matrix for scaled images that aren't

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index 2a449d6d8fa8e7732732bd9046517eb2a2ddb57d..69c5d7a2f3aa4794f3e6f90df3a299b214ddaf72 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -129,8 +129,6 @@ static inline bool cache_size_okay(const SkBitmap& bm, const SkMatrix& invMat) {
 bool SkBitmapProcState::possiblyScaleImage() {
     SkASSERT(NULL == fBitmap);
 
-    fAdjustedMatrix = false;
-
     if (fFilterLevel <= SkPaint::kLow_FilterLevel) {
         return false;
     }
@@ -196,19 +194,10 @@ bool SkBitmapProcState::possiblyScaleImage() {
         SkASSERT(fScaledBitmap.getPixels());
         fBitmap = &fScaledBitmap;
 
-        // set the inv matrix type to translate-only;
-        fInvMatrix.setTranslate(fInvMatrix.getTranslateX() / fInvMatrix.getScaleX(),
-                                fInvMatrix.getTranslateY() / fInvMatrix.getScaleY());
-
-#ifndef SK_IGNORE_PROPER_FRACTIONAL_SCALING
-        // reintroduce any fractional scaling missed by our integral scale done above.
-
-       float fractionalScaleX = roundedDestWidth/trueDestWidth;
-       float fractionalScaleY = roundedDestHeight/trueDestHeight;
+        // clean up the inverse matrix by incorporating the scale we just performed.
 
-       fInvMatrix.postScale(fractionalScaleX, fractionalScaleY);
-#endif
-        fAdjustedMatrix = true;
+        fInvMatrix.postScale(roundedDestWidth / fOrigBitmap.width(),
+                             roundedDestHeight / fOrigBitmap.height());
 
         // Set our filter level to low -- the only post-filtering this
         // image might require is some interpolation if the translation
@@ -372,8 +361,11 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
     bool clampClamp = SkShader::kClamp_TileMode == fTileModeX &&
                       SkShader::kClamp_TileMode == fTileModeY;
 
-    if (!(fAdjustedMatrix || clampClamp || trivialMatrix)) {
-        fInvMatrix.postIDiv(fOrigBitmap.width(), fOrigBitmap.height());
+    // TODO(reed): The following conditional and matrix division could really use
+    // a comment!
+
+    if (!(clampClamp || trivialMatrix)) {
+        fInvMatrix.postIDiv(fBitmap->width(), fBitmap->height());
     }
 
     // Now that all possible changes to the matrix have taken place, check