Gamma correction for distance field text.

src/core/SkGlyphCache.h

Index: src/core/SkGlyphCache.h
diff --git a/src/core/SkGlyphCache.h b/src/core/SkGlyphCache.h
index 8b404dcc097f627c687a532986f0ff5ed3046325..4daf6b06b6c07c04bcdada8fdcac516475b33a63 100644
--- a/src/core/SkGlyphCache.h
+++ b/src/core/SkGlyphCache.h
@@ -244,37 +244,74 @@ private:
     friend class SkGlyphCache_Globals;
 };
 
-class SkAutoGlyphCache {
+class SkAutoGlyphCacheBase {
 public:
-    SkAutoGlyphCache(SkGlyphCache* cache) : fCache(cache) {}
-    SkAutoGlyphCache(SkTypeface* typeface, const SkDescriptor* desc) {
-        fCache = SkGlyphCache::DetachCache(typeface, desc);
-    }
-    SkAutoGlyphCache(const SkPaint& paint,
-                     const SkDeviceProperties* deviceProperties,
-                     const SkMatrix* matrix) {
-        fCache = paint.detachCache(deviceProperties, matrix);
-    }
-    ~SkAutoGlyphCache() {
+    SkGlyphCache* getCache() const { return fCache; }
+
+    void release() {
         if (fCache) {
             SkGlyphCache::AttachCache(fCache);
+            fCache = NULL;
         }
     }
 
-    SkGlyphCache* getCache() const { return fCache; }
-
-    void release() {
+protected:
+    // Hide the constructors so we can't create one of these directly.
+    // Create SkAutoGlyphCache or SkAutoGlyphCacheNoCache instead.
+    SkAutoGlyphCacheBase(SkGlyphCache* cache) : fCache(cache) {}
+    SkAutoGlyphCacheBase(SkTypeface* typeface, const SkDescriptor* desc) {
+        fCache = SkGlyphCache::DetachCache(typeface, desc);
+    }
+    SkAutoGlyphCacheBase(const SkPaint& paint,
+                         const SkDeviceProperties* deviceProperties,
+                         const SkMatrix* matrix) {
+        fCache = NULL;
+    }
+    SkAutoGlyphCacheBase() {
+        fCache = NULL;
+    }
+    ~SkAutoGlyphCacheBase() {
         if (fCache) {
             SkGlyphCache::AttachCache(fCache);
-            fCache = NULL;
         }
     }
 
-private:
     SkGlyphCache*   fCache;
 
+private:
     static bool DetachProc(const SkGlyphCache*, void*);
 };
+
+class SkAutoGlyphCache : public SkAutoGlyphCacheBase {
+public:
+    SkAutoGlyphCache(SkGlyphCache* cache) : SkAutoGlyphCacheBase(cache) {}
+    SkAutoGlyphCache(SkTypeface* typeface, const SkDescriptor* desc) :
+        SkAutoGlyphCacheBase(typeface, desc) {}
+    SkAutoGlyphCache(const SkPaint& paint,
+                     const SkDeviceProperties* deviceProperties,
+                     const SkMatrix* matrix) {
+        fCache = paint.detachCache(deviceProperties, matrix, false);
+    }
+
+private:
+    SkAutoGlyphCache() : SkAutoGlyphCacheBase() {}
+};
 #define SkAutoGlyphCache(...) SK_REQUIRE_LOCAL_VAR(SkAutoGlyphCache)
 
+class SkAutoGlyphCacheNoGamma : public SkAutoGlyphCacheBase {
+public:
+    SkAutoGlyphCacheNoGamma(SkGlyphCache* cache) : SkAutoGlyphCacheBase(cache) {}
+    SkAutoGlyphCacheNoGamma(SkTypeface* typeface, const SkDescriptor* desc) :
+        SkAutoGlyphCacheBase(typeface, desc) {}
+    SkAutoGlyphCacheNoGamma(const SkPaint& paint,
+                            const SkDeviceProperties* deviceProperties,
+                            const SkMatrix* matrix) {
+        fCache = paint.detachCache(deviceProperties, matrix, true);
+    }
+
+private:
+    SkAutoGlyphCacheNoGamma() : SkAutoGlyphCacheBase() {}
+};
+#define SkAutoGlyphCacheNoGamma(...) SK_REQUIRE_LOCAL_VAR(SkAutoGlyphCacheNoGamma)
+
 #endif