grab from latest android

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

1 files changed, 50 insertions, 0 deletions

diff --git a/include/effects/SkPixelXorXfermode.h b/include/effects/SkPixelXorXfermode.h
new file mode 100644
index 0000000000..369e0e5444
--- /dev/null
+++ b/include/effects/SkPixelXorXfermode.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2007 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 SkPixelXorXfermode_DEFINED
+#define SkPixelXorXfermode_DEFINED
+
+#include "SkXfermode.h"
+
+/** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst).
+    This transformation does not follow premultiplied conventions, therefore
+    this proc *always* returns an opaque color (alpha == 255). Thus it is
+    not really usefull for operating on blended colors.
+*/
+class SkPixelXorXfermode : public SkXfermode {
+public:
+    SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
+
+    // override from SkFlattenable
+    virtual Factory getFactory();
+    virtual void flatten(SkFlattenableWriteBuffer&);
+
+protected:
+    // override from SkXfermode
+    virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst);
+
+private:
+    SkColor fOpColor;
+
+    SkPixelXorXfermode(SkFlattenableReadBuffer& rb);
+    // our private factory
+    static SkFlattenable* Create(SkFlattenableReadBuffer&);
+
+    typedef SkXfermode INHERITED;
+};
+
+#endif
+