Allow index sources to be unpremul.

src/images/SkScaledBitmapSampler.cpp

Index: src/images/SkScaledBitmapSampler.cpp
diff --git a/src/images/SkScaledBitmapSampler.cpp b/src/images/SkScaledBitmapSampler.cpp
index fe425d58b1cab09ac744114a18b8d0184049391a..11867817819d5cb91f5bfc3ca20c1d1693037455 100644
--- a/src/images/SkScaledBitmapSampler.cpp
+++ b/src/images/SkScaledBitmapSampler.cpp
@@ -396,10 +396,9 @@ static bool Sample_Index_D8888_SkipZ(void* SK_RESTRICT dstRow,
 
 static SkScaledBitmapSampler::RowProc
 get_index_to_8888_proc(const SkScaledBitmapSampler::Options& opts) {
-    if (!opts.fPremultiplyAlpha) {
-        // Unpremultiplied is not supported for an index source.
-        return NULL;
-    }
+    // The caller is expected to have created the source colortable
+    // properly with respect to premultiplication, so premul makes

[reed1, 2014/10/24 14:28:54]

s/premultiplication/opts.fPremultiplyAlpha

[scroggo, 2014/10/27 15:07:21]

Done.

+    // no difference here.
     // Dither makes no difference
     if (opts.fSkipZeros) {
         return Sample_Index_D8888_SkipZ;