Back to hashing source content, not .png.

tests/UnpremultiplyTest.cpp

-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkColorPriv.h"
-#include "SkUnPreMultiply.h"
-#include "Test.h"
-
-DEF_TEST(Unpremultiply, reporter) {
-    // Here we test that unpremultiplication is injective:
-    // no two distinct premul colors map to the same unpremul color.
-
-    // DM exploits this fact to safely hash .pngs instead of the original bitmaps.
-
-    // It is sufficient to test red.  Green and blue follow the same rules.
-    // This means we have at most 256*256 possible colors to deal with.
-    int hits[256*256];
-    for (size_t i = 0; i < SK_ARRAY_COUNT(hits); i++) {
-        hits[i] = 0;
-    }
-
-    for (int a = 0; a < 256; a++) {
-        for (int r = 0; r <= a; r++) {
-            SkPMColor pm = SkPackARGB32(a, r, 0, 0);
-            SkColor upm = SkUnPreMultiply::PMColorToColor(pm);
-
-            // ARGB -> AR
-            hits[upm >> 16]++;
-        }
-    }
-
-    for (size_t i = 0; i < SK_ARRAY_COUNT(hits); i++) {
-        REPORTER_ASSERT(reporter, hits[i] < 2);
-    }
-}