fix overflow in matrixproc, and add debugging code to test that
git-svn-id: http://skia.googlecode.com/svn/trunk@548 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index dd73c33..303696f 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -91,10 +91,11 @@
*/
void platformProcs();
- /** Given the size of a buffer, to be used for calling the matrix and
- sample procs, this return the maximum count that can be stored in the
- buffer, taking into account that filtering and scale-vs-affine affect
- this value.
+ /** Given the byte size of the index buffer to be passed to the matrix proc,
+ return the maximum number of resulting pixels that can be computed
+ (i.e. the number of SkPMColor values to be written by the sample proc).
+ This routine takes into account that filtering and scale-vs-affine
+ affect the amount of buffer space needed.
Only valid to call after chooseProcs (setContext) has been called. It is
safe to call this inside the shader's shadeSpan() method.