Gamma correction for distance field text.

src/core/SkScalerContext.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkScalerContext_DEFINED
 #define SkScalerContext_DEFINED
 
@@ skipping 165 matching lines @@
         glyphs return zero.
     */
     SkUnichar glyphIDToChar(uint16_t glyphID);
 
     unsigned    getGlyphCount() { return this->generateGlyphCount(); }
     void        getAdvance(SkGlyph*);
     void        getMetrics(SkGlyph*);
     void        getImage(const SkGlyph&);
     void        getPath(const SkGlyph&, SkPath*);
     void        getFontMetrics(SkPaint::FontMetrics*);
+    void*       getGammaLUTData(int& width, int& height, SkScalar contrast,

[reed1, 2014/05/28 19:45:17]

Need big dox. We almost never return a freshly allocated block, forcing the
caller to accept ownership. We need to document that the caller must call
sk_free on the returned pointer.

[jvanverth1, 2014/05/29 18:53:49]

Changed to get the size of the table first so we can allocate the data locally,
then an accessor to fill the table.

+                                SkScalar paintGamma, SkScalar deviceGamma);
 
 #ifdef SK_BUILD_FOR_ANDROID
     unsigned getBaseGlyphCount(SkUnichar charCode);
 
     // This function must be public for SkTypeface_android.h, but should not be
     // called by other callers
     SkFontID findTypefaceIdForChar(SkUnichar uni);
 #endif
 
     static void MakeRec(const SkPaint&, const SkDeviceProperties* deviceProperties,
@@ skipping 141 matching lines @@
     return static_cast<SkPaint::Hinting>(hint);
 }
 
 void SkScalerContextRec::setHinting(SkPaint::Hinting hinting) {
     fFlags = (fFlags & ~SkScalerContext::kHinting_Mask) |
                                 (hinting << SkScalerContext::kHinting_Shift);
 }
 
 
 #endif