1 files changed, 43 insertions, 0 deletions
diff --git a/include/core/SkEmptyShader.h b/include/core/SkEmptyShader.h
new file mode 100644
index 0000000..bf270bf
--- /dev/null
+++ b/include/core/SkEmptyShader.h
@@ -0,0 +1,43 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+
+#ifndef SkEmptyShader_DEFINED
+#define SkEmptyShader_DEFINED
+
+#include "SkShader.h"
+
+/**
+ *  \class SkEmptyShader
+ *  A Shader that always draws nothing. Its setContext always returns false,
+ *  so it never expects that its shadeSpan() methods will get called.
+ */
+class SK_API SkEmptyShader : public SkShader {
+public:
+    SkEmptyShader() {}
+
+    virtual uint32_t getFlags() SK_OVERRIDE;
+    virtual uint8_t getSpan16Alpha() const SK_OVERRIDE;
+    virtual bool setContext(const SkBitmap&, const SkPaint&,
+                            const SkMatrix&) SK_OVERRIDE;
+    virtual void shadeSpan(int x, int y, SkPMColor span[], int count) SK_OVERRIDE;
+    virtual void shadeSpan16(int x, int y, uint16_t span[], int count) SK_OVERRIDE;
+    virtual void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) SK_OVERRIDE;
+
+protected:
+    SkEmptyShader(SkFlattenableReadBuffer&);
+
+    virtual Factory getFactory() SK_OVERRIDE;
+    virtual void flatten(SkFlattenableWriteBuffer&) SK_OVERRIDE;
+
+private:
+    typedef SkShader INHERITED;
+};
+
+#endif