Index: include/effects/SkLumaXfermode.h |
diff --git a/include/effects/SkLumaXfermode.h b/include/effects/SkLumaXfermode.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b64c94d63fe1ba0d0b2f54f1195a971c54976021 |
--- /dev/null |
+++ b/include/effects/SkLumaXfermode.h |
@@ -0,0 +1,53 @@ |
+/* |
+ * Copyright 2013 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+ |
+#ifndef SkLumaXfermode_DEFINED |
+#define SkLumaXfermode_DEFINED |
+ |
+#include "SkXfermode.h" |
+ |
+/** |
+ * Luminance mask transfer, as defined in |
+ * http://www.w3.org/TR/SVG/masking.html#Masking |
+ * http://www.w3.org/TR/css-masking/#MaskValues |
+ * |
+ * The luminance-to-alpha function is applied before performing a standard |
+ * SrcIn or DstIn xfer: |
reed1
2013/08/22 18:35:51
Is this list (srcin, dstin) complete, or just e.g.
f(malita)
2013/08/22 19:25:52
It is complete with regard to SVG/CSS masking supp
|
+ * |
+ * luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a |
reed1
2013/08/22 18:35:51
Can you document what happens to the resulting r,g
f(malita)
2013/08/22 19:25:52
Will do.
|
+ * |
+ * The only supported submodes are SrcIn and DstIn. |
+ */ |
+class SK_API SkLumaMaskXfermode : public SkXfermode { |
+public: |
+ static SkXfermode* Create(SkXfermode::Mode); |
reed1
2013/08/22 18:35:51
Should you support another Create that takes SkXfe
f(malita)
2013/08/22 19:25:52
This ties into the decision to support arbitrary t
|
+ |
+ virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE; |
+ virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, |
+ const SkAlpha aa[]) const SK_OVERRIDE; |
+ |
+ SK_DEVELOPER_TO_STRING() |
+ SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode) |
+ |
+#if SK_SUPPORT_GPU |
+ virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*, |
+ GrTexture*) const SK_OVERRIDE; |
+#endif |
+ |
+protected: |
+ SkLumaMaskXfermode(SkFlattenableReadBuffer&); |
+ virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; |
+ |
+private: |
+ SkLumaMaskXfermode(SkXfermode::Mode); |
+ |
+ const SkXfermode::Mode fMode; |
+ |
+ typedef SkXfermode INHERITED; |
+}; |
+ |
+#endif |