Add an option to create unpremultiplied bitmaps.

Currently they cannot be used directly by Skia, but
the pixels can be used elsewhere.

SkImageDecoder:
Add functions to require unpremultiplied output
and query the presence of the requirement

SkImageDecoder_libpng:
SkImageDecoder_libwebp:
SkImageDecoder_WIC:
Respect the requirement for unpremultiplied output.
TODO: Fix SkImageDecoder_CG.

SkScaledBitmapSampler:
Add procs to skip premultiplication and a boolean
parameter to use those procs.

ImageDecodingTest:
Test unpremultiplied bitmap decoding.

SampleUnpremul:
Add a sample which allows visually comparing between the
unpremultiplied version (copied into a premultiplied bitmap,
since drawing unpremultiplied is not currently supported)
and a premultiplied version of image files.

gm.h:
Add a getter for the resource path, so Samples can use it.

As of patch set 13, https://codereview.chromium.org/16816016/
and https://codereview.chromium.org/16983004/, which were
approved separately.

R=reed@google.com

Review URL: https://codereview.chromium.org/16410009

git-svn-id: http://skia.googlecode.com/svn/trunk@9612 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 4 insertions, 0 deletions

diff --git a/gm/gm.h b/gm/gm.h
index 6e34d3dede..bb263c7741 100644
--- a/gm/gm.h
+++ b/gm/gm.h
@@ -80,6 +80,10 @@ namespace skiagm {
             gResourcePath = resourcePath;
         }
 
+        static SkString& GetResourcePath() {
+            return gResourcePath;
+        }
+
         bool isCanvasDeferred() const { return fCanvasIsDeferred; }
         void setCanvasIsDeferred(bool isDeferred) {
             fCanvasIsDeferred = isDeferred;