src/third_party/skia/tests/BitmapHasherTest.cpp

   1 /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkBitmapHasher.h"
   9
  10 #include "SkBitmap.h"
  11 #include "SkColor.h"
  12 #include "Test.h"
  13
  14 // Word size that is large enough to hold results of any checksum type.
  15 typedef uint64_t checksum_result;
  16
  17 // Fill in bitmap with test data.
  18 static void CreateTestBitmap(SkBitmap* bitmap, int width, int height,
  19                              SkColor color, skiatest::Reporter* reporter) {
  20     bitmap->allocN32Pixels(width, height, kOpaque_SkAlphaType);
  21     bitmap->eraseColor(color);
  22 }
  23
  24 DEF_TEST(BitmapHasher, reporter) {
  25     // Test SkBitmapHasher
  26     SkBitmap bitmap;
  27     uint64_t digest;
  28     // initial test case
  29     CreateTestBitmap(&bitmap, 333, 555, SK_ColorBLUE, reporter);
  30     REPORTER_ASSERT(reporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
  31     REPORTER_ASSERT(reporter, digest == 0xfb2903562766ef87ULL);
  32     // same pixel data but different dimensions should yield a different checksum
  33     CreateTestBitmap(&bitmap, 555, 333, SK_ColorBLUE, reporter);
  34     REPORTER_ASSERT(reporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
  35     REPORTER_ASSERT(reporter, digest == 0xfe04023fb97d0f61ULL);
  36     // same dimensions but different color should yield a different checksum
  37     CreateTestBitmap(&bitmap, 555, 333, SK_ColorGREEN, reporter);
  38     REPORTER_ASSERT(reporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
  39     REPORTER_ASSERT(reporter, digest == 0x2423c51cad6d1edcULL);
  40 }