grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 65 insertions, 0 deletions

diff --git a/include/utils/SkUnitMappers.h b/include/utils/SkUnitMappers.h
new file mode 100644
index 0000000000..51708b63fc
--- /dev/null
+++ b/include/utils/SkUnitMappers.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SkUnitMappers_DEFINED
+#define SkUnitMappers_DEFINED
+
+#include "SkUnitMapper.h"
+
+/** This discretizes the range [0...1) into N discret values.
+*/
+class SkDiscreteMapper : public SkUnitMapper {
+public:
+    SkDiscreteMapper(int segments);
+    // override from SkUnitMapper
+    virtual uint16_t mapUnit16(uint16_t x);
+
+protected:
+    SkDiscreteMapper(SkFlattenableReadBuffer& );
+    // overrides from SkFlattenable
+    virtual void flatten(SkFlattenableWriteBuffer& );
+    virtual Factory getFactory();
+private:
+    int     fSegments;
+    SkFract fScale;    // computed from fSegments
+
+    static SkFlattenable* Create(SkFlattenableReadBuffer& buffer);
+    
+    typedef SkUnitMapper INHERITED;
+};
+
+/** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
+    center of the sphere, and 1 maps to the edge.
+*/
+class SkCosineMapper : public SkUnitMapper {
+public:
+    SkCosineMapper() {}
+    // override from SkUnitMapper
+    virtual uint16_t mapUnit16(uint16_t x);
+
+protected:
+    SkCosineMapper(SkFlattenableReadBuffer&);
+    // overrides from SkFlattenable
+    virtual Factory getFactory();
+
+private:
+    static SkFlattenable* Create(SkFlattenableReadBuffer&);
+
+    typedef SkUnitMapper INHERITED;
+};
+
+#endif
+