Improvements to readpixels GM

We don't support unpremultiplied images. Therefore:
- Don't test unpremul source images.
- After doing an unpremultiplying read, make sure to premul before drawing

For this to work with F16, add support for F16 sources to
SkColorSpaceXform.

Public API change is comments-only.
TBR=reed@google.com

BUG=skia:

Change-Id: Ie05b58231e99ca88cd7792b65ffbb4f390b01726
Reviewed-on: https://skia-review.googlesource.com/9900
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/core/SkColorSpaceXform.h b/include/core/SkColorSpaceXform.h
index 0c4fd7aa33..fc38b7cbbc 100644
--- a/include/core/SkColorSpaceXform.h
+++ b/include/core/SkColorSpaceXform.h
@@ -32,15 +32,15 @@ public:
         kRGB_U16_BE_ColorFormat,   // Src only
         kRGBA_U16_BE_ColorFormat,  // Src only
 
-        kRGBA_F16_ColorFormat,     // Dst only
+        kRGBA_F16_ColorFormat,
         kRGBA_F32_ColorFormat,     // Dst only
     };
 
     /**
      *  Apply the color conversion to a |src| buffer, storing the output in the |dst| buffer.
      *
-     *  F16 and F32 are only supported as dst color formats, and only when the dst color space
-     *  is linear.  This function will return false in unsupported cases.
+     *  F32 is only supported as a dst color format. F16 and F32 are only supported when the color
+     *  space is linear. This function will return false in unsupported cases.
      *
      *  @param dst            Stored in the format described by |dstColorFormat|
      *  @param src            Stored in the format described by |srcColorFormat|