Gamma correction for distance field text.

src/core/SkGlyphCache.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 SkGlyphCache_DEFINED
@@ skipping 226 matching lines @@
         void* fData;
     };
     AuxProcRec* fAuxProcList;
     void invokeAndRemoveAuxProcs();
 
     inline static SkGlyphCache* FindTail(SkGlyphCache* head);
 
     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() {
-        if (fCache) {
-            SkGlyphCache::AttachCache(fCache);
-        }
-    }
-
     SkGlyphCache* getCache() const { return fCache; }
 
     void release() {
         if (fCache) {
             SkGlyphCache::AttachCache(fCache);
             fCache = NULL;
         }
     }
 
-private:
+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);
+        }
+    }
+
     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