Publicly expose one accelerated swizzle.

tests/SwizzlerTest.cpp

Index: tests/SwizzlerTest.cpp
diff --git a/tests/SwizzlerTest.cpp b/tests/SwizzlerTest.cpp
index e1626d52f114d761c8ac3331d8d40205f8f955a7..1fe93587d83cc862c8f1d538c843801c047c57c0 100644
--- a/tests/SwizzlerTest.cpp
+++ b/tests/SwizzlerTest.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkSwizzle.h"
 #include "SkSwizzler.h"
 #include "Test.h"
 #include "SkOpts.h"
@@ -157,3 +158,27 @@ DEF_TEST(SwizzleOpts, r) {
     SkOpts::RGBA_to_bgrA(&dst, &src, 1);
     REPORTER_ASSERT(r, dst == 0xFA04ADCA);
 }
+
+DEF_TEST(PublicSwizzleOpts, r) {
+    uint32_t dst, src;
+
+    // forall c, c*255 == c, c*0 == 0
+    for (int c = 0; c <= 255; c++) {

[mtklein, 2016/03/23 17:35:13]

We making these public too?

[tomhudson, 2016/03/23 17:38:48]

My bad.
Done.

+        src = (255<<24) | c;
+        SkOpts::RGBA_to_rgbA(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == src);
+        SkOpts::RGBA_to_bgrA(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == (uint32_t)((255<<24) | (c<<16)));
+
+        src = (0<<24) | c;
+        SkOpts::RGBA_to_rgbA(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == 0);
+        SkOpts::RGBA_to_bgrA(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == 0);
+    }
+
+    // check a totally arbitrary color
+    src = 0xFACEB004;
+    SkSwapRB(&dst, &src, 1);
+    REPORTER_ASSERT(r, dst == 0xFA04B0CE);
+}