Add chrome_pdf::MatchesPngFile() utility

Adds a MatchesPngFile() utility wrapper around cc::MatchesPNGFile() that
tests if an SkImage matches a PNG file within //pdf/test/data.

Bug: 1317832
Change-Id: I0ae8322e2530736378c3fb54e855b5d467fb196d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3597663
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/main@{#994456}

pdf/BUILD.gn

@@ -331,6 +331,7 @@ if (enable_pdf) {
       ":internal",
       ":ppapi_migration",
       "//base",
+      "//cc:test_support",
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/blink/public/common:headers",

pdf/pdfium/pdfium_page_unittest.cc

@@ -12,8 +12,6 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/scoped_feature_list.h"
-#include "cc/test/pixel_comparator.h"
-#include "cc/test/pixel_test_utils.h"
 #include "pdf/accessibility_structs.h"
 #include "pdf/pdfium/pdfium_engine.h"
 #include "pdf/pdfium/pdfium_test_base.h"
@@ -23,7 +21,10 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
 #include "third_party/pdfium/public/fpdf_formfill.h"
-#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkPixmap.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/accessibility/accessibility_features.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
@@ -776,17 +777,14 @@ class PDFiumPageThumbnailTest : public PDFiumTestBase {
     ASSERT_GT(stride, 0);
     ASSERT_EQ(image_info.minRowBytes(), static_cast<size_t>(stride));
     std::vector<uint8_t> data = thumbnail.TakeData();
-    SkBitmap bitmap;
-    EXPECT_TRUE(bitmap.installPixels(image_info, data.data(),
-                                     image_info.minRowBytes()));
+    sk_sp<SkImage> image = SkImage::MakeRasterCopy(
+        SkPixmap(image_info, data.data(), image_info.minRowBytes()));
+    ASSERT_TRUE(image);
 
     base::FilePath expectation_png_file_path = GetThumbnailTestData(
         expectation_file_prefix, page_index, device_pixel_ratio);
 
-    EXPECT_TRUE(cc::MatchesPNGFile(
-        bitmap, GetTestDataFilePath(expectation_png_file_path),
-        cc::ExactPixelComparator(/*discard_alpha=*/false)))
-        << "Reference: " << expectation_png_file_path;
+    EXPECT_TRUE(MatchesPngFile(image.get(), expectation_png_file_path));
   }
 };
 

pdf/pdfium/pdfium_print_unittest.cc

@@ -8,7 +8,6 @@
 
 #include "base/files/file_path.h"
 #include "base/strings/string_piece.h"
-#include "cc/test/pixel_test_utils.h"
 #include "pdf/pdfium/pdfium_engine.h"
 #include "pdf/pdfium/pdfium_engine_exports.h"
 #include "pdf/pdfium/pdfium_test_base.h"
@@ -20,7 +19,9 @@
 #include "third_party/abseil-cpp/absl/types/optional.h"
 #include "third_party/blink/public/web/web_print_params.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/skia_conversions.h"
@@ -39,8 +40,8 @@ constexpr gfx::Rect kPrintableAreaRect = {{18, 18}, {576, 733}};
 using ExpectedDimensions = std::vector<gfx::SizeF>;
 
 base::FilePath GetReferenceFilePath(base::StringPiece test_filename) {
-  return GetTestDataFilePath(base::FilePath(FILE_PATH_LITERAL("pdfium_print"))
-                                 .AppendASCII(test_filename));
+  return base::FilePath(FILE_PATH_LITERAL("pdfium_print"))
+      .AppendASCII(test_filename);
 }
 
 blink::WebPrintParams GetDefaultPrintParams() {
@@ -97,10 +98,8 @@ void CheckPdfRendering(const std::vector<uint8_t>& pdf_data,
   ASSERT_TRUE(exports.RenderPDFPageToBitmap(pdf_data, page_number, settings,
                                             page_bitmap.getPixels()));
 
-  EXPECT_TRUE(cc::MatchesPNGFile(
-      page_bitmap, GetReferenceFilePath(expected_png_filename),
-      cc::ExactPixelComparator(/*discard_alpha=*/false)))
-      << "Reference: " << expected_png_filename;
+  EXPECT_TRUE(MatchesPngFile(page_bitmap.asImage().get(),
+                             GetReferenceFilePath(expected_png_filename)));
 }
 
 }  // namespace

pdf/test/DEPS

@@ -0,0 +1,3 @@
+include_rules = [
+  "+cc/test",
+]

pdf/test/test_helpers.cc

@@ -7,9 +7,13 @@
 #include "base/base_paths.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
+#include "cc/test/pixel_comparator.h"
+#include "cc/test/pixel_test_utils.h"
 #include "pdf/ppapi_migration/bitmap.h"
+#include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "ui/gfx/geometry/skia_conversions.h"
 
 namespace chrome_pdf {
@@ -25,6 +29,21 @@ base::FilePath GetTestDataFilePath(const base::FilePath& path) {
       .Append(path);
 }
 
+testing::AssertionResult MatchesPngFile(
+    const SkImage* actual_image,
+    const base::FilePath& expected_png_file) {
+  SkBitmap actual_bitmap;
+  if (!actual_image->asLegacyBitmap(&actual_bitmap))
+    return testing::AssertionFailure() << "Reference: " << expected_png_file;
+
+  if (!cc::MatchesPNGFile(actual_bitmap, GetTestDataFilePath(expected_png_file),
+                          cc::ExactPixelComparator(/*discard_alpha=*/false))) {
+    return testing::AssertionFailure() << "Reference: " << expected_png_file;
+  }
+
+  return testing::AssertionSuccess();
+}
+
 SkBitmap CreateSkiaImageForTesting(const gfx::Size& size, SkColor color) {
   SkBitmap bitmap = CreateN32PremulSkBitmap(gfx::SizeToSkISize(size));
   bitmap.eraseColor(color);

pdf/test/test_helpers.h

@@ -6,9 +6,11 @@
 #define PDF_TEST_TEST_HELPERS_H_
 
 #include "base/files/file_path.h"
+#include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 class SkBitmap;
+class SkImage;
 
 namespace gfx {
 class Size;
@@ -20,6 +22,12 @@ namespace chrome_pdf {
 // the empty path if the source root can't be found.
 base::FilePath GetTestDataFilePath(const base::FilePath& path);
 
+// Matches `actual_image` against the PNG at the file path `expected_png_file`.
+// The path must be relative to //pdf/test/data.
+testing::AssertionResult MatchesPngFile(
+    const SkImage* actual_image,
+    const base::FilePath& expected_png_file);
+
 // Creates a Skia-format `Image` of a given size filled with a given color.
 SkBitmap CreateSkiaImageForTesting(const gfx::Size& size, SkColor color);