rename SkBitmapChecksummer as SkBitmapHasher, and prepare for it to possibly use
some algorithm other than CityHash
Review URL: https://codereview.chromium.org/14170010
git-svn-id: http://skia.googlecode.com/svn/trunk@8639 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/BitmapHasherTest.cpp b/tests/BitmapHasherTest.cpp
new file mode 100644
index 0000000..6aa464d
--- /dev/null
+++ b/tests/BitmapHasherTest.cpp
@@ -0,0 +1,64 @@
+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "Test.h"
+
+#include "SkBitmap.h"
+#include "SkBitmapHasher.h"
+#include "SkColor.h"
+
+// Word size that is large enough to hold results of any checksum type.
+typedef uint64_t checksum_result;
+
+namespace skiatest {
+ class BitmapHasherTestClass : public Test {
+ public:
+ static Test* Factory(void*) {return SkNEW(BitmapHasherTestClass); }
+ protected:
+ virtual void onGetName(SkString* name) { name->set("BitmapHasher"); }
+ virtual void onRun(Reporter* reporter) {
+ this->fReporter = reporter;
+ RunTest();
+ }
+ private:
+
+ // Fill in bitmap with test data.
+ void CreateTestBitmap(SkBitmap &bitmap, SkBitmap::Config config, int width, int height,
+ SkColor color) {
+ bitmap.setConfig(config, width, height);
+ REPORTER_ASSERT(fReporter, bitmap.allocPixels());
+ bitmap.setIsOpaque(true);
+ bitmap.eraseColor(color);
+ }
+
+ void RunTest() {
+ // Test SkBitmapHasher
+ SkBitmap bitmap;
+ SkHashDigest digest;
+ // initial test case
+ CreateTestBitmap(bitmap, SkBitmap::kARGB_8888_Config, 333, 555, SK_ColorBLUE);
+ REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
+ REPORTER_ASSERT(fReporter, digest == 0x18f9df68b1b02f38ULL);
+ // same pixel data but different dimensions should yield a different checksum
+ CreateTestBitmap(bitmap, SkBitmap::kARGB_8888_Config, 555, 333, SK_ColorBLUE);
+ REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
+ REPORTER_ASSERT(fReporter, digest == 0x6b0298183f786c8eULL);
+ // same dimensions but different color should yield a different checksum
+ CreateTestBitmap(bitmap, SkBitmap::kARGB_8888_Config, 555, 333, SK_ColorGREEN);
+ REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
+ REPORTER_ASSERT(fReporter, digest == 0xc6b4b3f6fadaaf37ULL);
+ // same pixel colors in a different config should yield the same checksum
+ CreateTestBitmap(bitmap, SkBitmap::kARGB_4444_Config, 555, 333, SK_ColorGREEN);
+ REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
+ REPORTER_ASSERT(fReporter, digest == 0xc6b4b3f6fadaaf37ULL);
+ }
+
+ Reporter* fReporter;
+ };
+
+ static TestRegistry gReg(BitmapHasherTestClass::Factory);
+}