Convert SkiaBitLocker to use PaintCanvas

third_party/WebKit/Source/platform/mac/GraphicsContextCanvasTest.mm

+// Copyright (c) 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "platform/mac/GraphicsContextCanvas.h"
+#include "skia/ext/skia_utils_mac.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+enum TestType {
+  TestIdentity = 0,
+  TestTranslate = 1,
+  TestClip = 2,
+  TestXClip = TestTranslate | TestClip,
+};
+
+void RunTest(TestType test) {
+  const unsigned width = 2;
+  const unsigned height = 2;
+  const unsigned storageSize = width * height;
+  const unsigned original[] = {0xFF333333, 0xFF666666, 0xFF999999, 0xFFCCCCCC};
+  EXPECT_EQ(storageSize, sizeof(original) / sizeof(original[0]));
+  unsigned bits[storageSize];
+  memcpy(bits, original, sizeof(original));
+  SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
+  SkBitmap bitmap;
+  bitmap.installPixels(info, bits, info.minRowBytes());
+
+  PaintCanvas canvas(bitmap);
+  if (test & TestTranslate)
+    canvas.translate(width / 2, 0);
+  if (test & TestClip) {
+    SkRect clipRect = {0, height / 2, width, height};
+    canvas.clipRect(clipRect);
+  }
+  {
+    SkIRect clip =
+        SkIRect::MakeSize(canvas.getBaseLayerSize())
+            .makeOffset(
+                (test & TestTranslate) ? -(static_cast<int>(width)) / 2 : 0, 0);
+    GraphicsContextCanvas bitLocker(&canvas, clip);
+    CGContextRef cgContext = bitLocker.cgContext();
+    CGColorRef testColor = CGColorGetConstantColor(kCGColorWhite);
+    CGContextSetFillColorWithColor(cgContext, testColor);
+    CGRect cgRect = {{0, 0}, {width, height}};
+    CGContextFillRect(cgContext, cgRect);
+  }
+  const unsigned results[][storageSize] = {
+      {0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF},  // identity
+      {0xFF333333, 0xFFFFFFFF, 0xFF999999, 0xFFFFFFFF},  // translate
+      {0xFF333333, 0xFF666666, 0xFFFFFFFF, 0xFFFFFFFF},  // clip
+      {0xFF333333, 0xFF666666, 0xFF999999, 0xFFFFFFFF}   // translate | clip
+  };
+  for (unsigned index = 0; index < storageSize; index++)
+    EXPECT_EQ(results[test][index], bits[index]);
+}
+
+TEST(GraphicsContextCanvasTest, Identity) {
+  RunTest(TestIdentity);
+}
+
+TEST(GraphicsContextCanvasTest, Translate) {
+  RunTest(TestTranslate);
+}
+
+TEST(GraphicsContextCanvasTest, Clip) {
+  RunTest(TestClip);
+}
+
+TEST(GraphicsContextCanvasTest, XClip) {
+  RunTest(TestXClip);
+}
+
+}  // namespace