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

src/opts/SkMorphology_opts.h

+/*
+ * 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>
+
+/**
+ * All morphology procs have the same signature: src is the source buffer, dst the
+ * destination buffer, radius is the morphology radius, width and height are the bounds
+ * of the destination buffer (in pixels), and srcStride and dstStride are the
+ * number of pixels per row in each buffer. All buffers are 8888.
+ */
+
+typedef void (*SkMorphologyProc)(const SkPMColor* src, SkPMColor* dst, int radius,
+                                 int width, int height, int srcStride, int dstStride);
+
+enum SkMorphologyProcType {
+    SkMorphologyDilateX_Type,

[reed1, 2013/10/30 20:14:28]

bike shed : skia likes to have everything after the _ be the enum type name
(modulo the s if the name is plural)

e.g.

enum SkMorphologyProcType {
    kDilateX_SkMorphologyProcType,
    ...
};

This way the _ suffix can act as the visual grouper, and the leading part is the
distinctive part.

See SkAlpha.h -- SkAlphaType for an example

[Stephen White, 2013/10/30 20:48:06]

Done.

+    SkMorphologyDilateY_Type,
+    SkMorphologyErodeX_Type,
+    SkMorphologyErodeY_Type
+};
+
+SkMorphologyProc SkMorphologyGetPlatformProc(SkMorphologyProcType type);