Implement SSE2-based implementations of the morphology filters (dilate &

src/opts/SkMorphology_opts.h

Index: src/opts/SkMorphology_opts.h
diff --git a/src/opts/SkMorphology_opts.h b/src/opts/SkMorphology_opts.h
new file mode 100644
index 0000000000000000000000000000000000000000..62652836f69575ed58735661192d1c5f4487d595
--- /dev/null
+++ b/src/opts/SkMorphology_opts.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2013 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.
+ */
+
+#include <SkColor.h>
+
+typedef void (*SkMorphologyProc)(const SkPMColor* src, SkPMColor* dst, int radius,
+                                 int width, int height, int srcStride, int dstStride);

[reed1, 2013/10/30 15:15:04]

are these logically size_t? we use size_t for byte-offsets in general (e.g.
rowBytes)

[mtklein, 2013/10/30 15:44:47]

These strides are pixel counts, so I think it makes sense to leave as ints.

[reed1, 2013/10/30 15:49:52]

Ah, then lets rename/document them to make that clear.

[Stephen White, 2013/10/30 19:47:17]

Done.

+
+SkMorphologyProc SkDilateXGetPlatformProc();

[reed1, 2013/10/30 15:15:04]

"if" this list wants to grow in the future, I wonder if an enum would be easier
to remember...

enum SkMorphologyType {
    kDilateX_SkMorphologyType,
    ...
};

SkMorphologyProc SkGetMorphologyPlatformProc(SkMorphologyType);

[Stephen White, 2013/10/30 19:47:17]

I don't forsee the list growing, but I've turned it into an enum anyway.

+SkMorphologyProc SkDilateYGetPlatformProc();
+SkMorphologyProc SkErodeXGetPlatformProc();
+SkMorphologyProc SkErodeYGetPlatformProc();