1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/extras/dec/pgx_test.cc b/third_party/jpeg-xl/lib/extras/dec/pgx_test.cc
new file mode 100644
index 0000000000..78ed689d07
--- /dev/null
+++ b/third_party/jpeg-xl/lib/extras/dec/pgx_test.cc
@@ -0,0 +1,79 @@
+// Copyright (c) the JPEG XL Project 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 "lib/extras/dec/pgx.h"
+
+#include "lib/extras/packed_image_convert.h"
+#include "lib/jxl/image_bundle.h"
+#include "lib/jxl/testing.h"
+
+namespace jxl {
+namespace extras {
+namespace {
+
+Span<const uint8_t> MakeSpan(const char* str) {
+  return Span<const uint8_t>(reinterpret_cast<const uint8_t*>(str),
+                             strlen(str));
+}
+
+TEST(CodecPGXTest, Test8bits) {
+  std::string pgx = "PG ML + 8 2 3\npixels";
+
+  PackedPixelFile ppf;
+  ThreadPool* pool = nullptr;
+
+  EXPECT_TRUE(DecodeImagePGX(MakeSpan(pgx.c_str()), ColorHints(), &ppf));
+  CodecInOut io;
+  EXPECT_TRUE(ConvertPackedPixelFileToCodecInOut(ppf, pool, &io));
+
+  ScaleImage(255.f, io.Main().color());
+
+  EXPECT_FALSE(io.metadata.m.bit_depth.floating_point_sample);
+  EXPECT_EQ(8u, io.metadata.m.bit_depth.bits_per_sample);
+  EXPECT_TRUE(io.metadata.m.color_encoding.IsGray());
+  EXPECT_EQ(2u, io.xsize());
+  EXPECT_EQ(3u, io.ysize());
+
+  float eps = 1e-5;
+  EXPECT_NEAR('p', io.Main().color()->Plane(0).Row(0)[0], eps);
+  EXPECT_NEAR('i', io.Main().color()->Plane(0).Row(0)[1], eps);
+  EXPECT_NEAR('x', io.Main().color()->Plane(0).Row(1)[0], eps);
+  EXPECT_NEAR('e', io.Main().color()->Plane(0).Row(1)[1], eps);
+  EXPECT_NEAR('l', io.Main().color()->Plane(0).Row(2)[0], eps);
+  EXPECT_NEAR('s', io.Main().color()->Plane(0).Row(2)[1], eps);
+}
+
+TEST(CodecPGXTest, Test16bits) {
+  std::string pgx = "PG ML + 16 2 3\np_i_x_e_l_s_";
+
+  PackedPixelFile ppf;
+  ThreadPool* pool = nullptr;
+
+  EXPECT_TRUE(DecodeImagePGX(MakeSpan(pgx.c_str()), ColorHints(), &ppf));
+  CodecInOut io;
+  EXPECT_TRUE(ConvertPackedPixelFileToCodecInOut(ppf, pool, &io));
+
+  ScaleImage(255.f, io.Main().color());
+
+  EXPECT_FALSE(io.metadata.m.bit_depth.floating_point_sample);
+  EXPECT_EQ(16u, io.metadata.m.bit_depth.bits_per_sample);
+  EXPECT_TRUE(io.metadata.m.color_encoding.IsGray());
+  EXPECT_EQ(2u, io.xsize());
+  EXPECT_EQ(3u, io.ysize());
+
+  // Comparing ~16-bit numbers in floats, only ~7 bits left.
+  float eps = 1e-3;
+  const auto& plane = io.Main().color()->Plane(0);
+  EXPECT_NEAR(256.0f * 'p' + '_', plane.Row(0)[0] * 257, eps);
+  EXPECT_NEAR(256.0f * 'i' + '_', plane.Row(0)[1] * 257, eps);
+  EXPECT_NEAR(256.0f * 'x' + '_', plane.Row(1)[0] * 257, eps);
+  EXPECT_NEAR(256.0f * 'e' + '_', plane.Row(1)[1] * 257, eps);
+  EXPECT_NEAR(256.0f * 'l' + '_', plane.Row(2)[0] * 257, eps);
+  EXPECT_NEAR(256.0f * 's' + '_', plane.Row(2)[1] * 257, eps);
+}
+
+}  // namespace
+}  // namespace extras
+}  // namespace jxl