Basic pixel tests for cc

ui/compositor/layer_unittest.cc

Index: ui/compositor/layer_unittest.cc
diff --git a/ui/compositor/layer_unittest.cc b/ui/compositor/layer_unittest.cc
index 80e9384d7348ccacc0a5e61ebfd084d543231982..7008763b88e69c3f222c4f623eb6340bf96dabc3 100644
--- a/ui/compositor/layer_unittest.cc
+++ b/ui/compositor/layer_unittest.cc
@@ -11,6 +11,7 @@
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "cc/layer.h"
+#include "cc/test/pixel_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_setup.h"
@@ -22,77 +23,12 @@
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gfx/skia_util.h"
 
+using cc::test::IsSameAsPNGFile;
+
 namespace ui {
 
 namespace {
 
-// Encodes a bitmap into a PNG and write to disk. Returns true on success. The
-// parent directory does not have to exist.
-bool WritePNGFile(const SkBitmap& bitmap, const FilePath& file_path) {
-  std::vector<unsigned char> png_data;
-  if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &png_data) &&
-      file_util::CreateDirectory(file_path.DirName())) {
-    char* data = reinterpret_cast<char*>(&png_data[0]);
-    int size = static_cast<int>(png_data.size());
-    return file_util::WriteFile(file_path, data, size) == size;
-  }
-  return false;
-}
-
-// Reads and decodes a PNG image to a bitmap. Returns true on success. The PNG
-// should have been encoded using |gfx::PNGCodec::Encode|.
-bool ReadPNGFile(const FilePath& file_path, SkBitmap* bitmap) {
-  DCHECK(bitmap);
-  std::string png_data;
-  return file_util::ReadFileToString(file_path, &png_data) &&
-         gfx::PNGCodec::Decode(reinterpret_cast<unsigned char*>(&png_data[0]),
-                               png_data.length(),
-                               bitmap);
-}
-
-// Compares with a PNG file on disk, and returns true if it is the same as
-// the given image. |ref_img_path| is absolute.
-bool IsSameAsPNGFile(const SkBitmap& gen_bmp, FilePath ref_img_path) {
-  SkBitmap ref_bmp;
-  if (!ReadPNGFile(ref_img_path, &ref_bmp)) {
-    LOG(ERROR) << "Cannot read reference image: " << ref_img_path.value();
-    return false;
-  }
-
-  if (ref_bmp.width() != gen_bmp.width() ||
-      ref_bmp.height() != gen_bmp.height()) {
-    LOG(ERROR)
-        << "Dimensions do not match (Expected) vs (Actual):"
-        << "(" << ref_bmp.width() << "x" << ref_bmp.height()
-            << ") vs. "
-        << "(" << gen_bmp.width() << "x" << gen_bmp.height() << ")";
-    return false;
-  }
-
-  // Compare pixels and create a simple diff image.
-  int diff_pixels_count = 0;
-  SkAutoLockPixels lock_bmp(gen_bmp);
-  SkAutoLockPixels lock_ref_bmp(ref_bmp);
-  // The reference images were saved with no alpha channel. Use the mask to
-  // set alpha to 0.
-  uint32_t kAlphaMask = 0x00FFFFFF;
-  for (int x = 0; x < gen_bmp.width(); ++x) {
-    for (int y = 0; y < gen_bmp.height(); ++y) {
-      if ((*gen_bmp.getAddr32(x, y) & kAlphaMask) !=
-          (*ref_bmp.getAddr32(x, y) & kAlphaMask)) {
-        ++diff_pixels_count;
-      }
-    }
-  }
-
-  if (diff_pixels_count != 0) {
-    LOG(ERROR) << "Images differ by pixel count: " << diff_pixels_count;
-    return false;
-  }
-
-  return true;
-}
-
 // Returns a comma-separated list of the names of |layer|'s children in
 // bottom-to-top stacking order.
 std::string GetLayerChildrenNames(const Layer& layer) {