test+bench new swizzle SkOpts

tests/SwizzlerTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSwizzler.h"
 #include "Test.h"
+#include "SkOpts.h"
 
 // These are the values that we will look for to indicate that the fill was successful
 static const uint8_t kFillIndex = 0x11;
 static const uint8_t kFillGray = 0x22;
 static const uint16_t kFill565 = 0x3344;
 static const uint32_t kFillColor = 0x55667788;
 
 static void check_fill(skiatest::Reporter* r,
                        const SkImageInfo& imageInfo,
                        uint32_t startRow,
@@ skipping 97 matching lines @@
                                     kFillGray);
                             check_fill(r, color565Info, startRow, endRow, color565RowBytes, offset,
                                     kFill565);
                         }
                     }
                 }
             }
         }
     }
 }
+
+DEF_TEST(SwizzleOpts, r) {
+    uint32_t dst, src;
+
+    // forall c, c*255 == c, c*0 == 0
+    for (int c = 0; c <= 255; c++) {
+        src = (255<<24) | c;
+        SkOpts::premul_xxxa(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == src);
+        SkOpts::premul_swaprb_xxxa(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == (uint32_t)((255<<24) | (c<<16)));
+
+        src = (0<<24) | c;
+        SkOpts::premul_xxxa(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == 0);
+        SkOpts::premul_swaprb_xxxa(&dst, &src, 1);
+        REPORTER_ASSERT(r, dst == 0);
+    }
+
+    // check a totally arbitrary color
+    src = 0xFACEB004;
+    SkOpts::premul_xxxa(&dst, &src, 1);
+    REPORTER_ASSERT(r, dst == 0xFACAAD04);
+
+    // swap red and blue
+    SkOpts::swaprb_xxxa(&dst, &src, 1);
+    REPORTER_ASSERT(r, dst == 0xFA04B0CE);
+
+    // all together now
+    SkOpts::premul_swaprb_xxxa(&dst, &src, 1);
+    REPORTER_ASSERT(r, dst == 0xFA04ADCA);
+}