Extract transform_scanline_XXXX functions into transform_scanline.h for code-sharing

Review URL: https://codereview.appspot.com/6849065

git-svn-id: http://skia.googlecode.com/svn/trunk@6468 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 27 insertions, 3 deletions

diff --git a/include/images/SkImageEncoder.h b/include/images/SkImageEncoder.h
index 5e350d46ff..3fbfefa5f7 100644
--- a/include/images/SkImageEncoder.h
+++ b/include/images/SkImageEncoder.h
@@ -28,8 +28,25 @@ public:
         kDefaultQuality = 80
     };
 
-    bool encodeFile(const char file[], const SkBitmap&, int quality);
-    bool encodeStream(SkWStream*, const SkBitmap&, int quality);
+    /**
+     * Encode bitmap 'bm' in the desired format, writing results to
+     * file 'file', at quality level 'quality' (which can be in range
+     * 0-100).
+     *
+     * Calls the particular implementation's onEncode() method to
+     * actually do the encoding.
+     */
+    bool encodeFile(const char file[], const SkBitmap& bm, int quality);
+
+    /**
+     * Encode bitmap 'bm' in the desired format, writing results to
+     * stream 'stream', at quality level 'quality' (which can be in
+     * range 0-100).
+     *
+     * Calls the particular implementation's onEncode() method to
+     * actually do the encoding.
+     */
+    bool encodeStream(SkWStream* stream, const SkBitmap& bm, int quality);
 
     static bool EncodeFile(const char file[], const SkBitmap&, Type,
                            int quality);
@@ -37,7 +54,14 @@ public:
                            int quality);
 
 protected:
-    virtual bool onEncode(SkWStream*, const SkBitmap&, int quality) = 0;
+    /**
+     * Encode bitmap 'bm' in the desired format, writing results to
+     * stream 'stream', at quality level 'quality' (which can be in
+     * range 0-100).
+     *
+     * This must be overridden by each SkImageEncoder implementation.
+     */
+    virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) = 0;
 };
 
 // This macro declares a global (i.e., non-class owned) creation entry point