1 // Copyright (c) the JPEG XL Project Authors. All rights reserved.
2 //
3 // Use of this source code is governed by a BSD-style
4 // license that can be found in the LICENSE file.
5
6 #include "lib/jxl/blending.h"
7
8 #include "gmock/gmock.h"
9 #include "gtest/gtest.h"
10 #include "lib/extras/codec.h"
11 #include "lib/jxl/dec_file.h"
12 #include "lib/jxl/image_test_utils.h"
13 #include "lib/jxl/testdata.h"
14
15 namespace jxl {
16 namespace {
17
18 using ::testing::SizeIs;
19
TEST(BlendingTest,Crops)20 TEST(BlendingTest, Crops) {
21 ThreadPool* pool = nullptr;
22
23 const PaddedBytes compressed =
24 ReadTestData("jxl/blending/cropped_traffic_light.jxl");
25 DecompressParams dparams;
26 CodecInOut decoded;
27 ASSERT_TRUE(DecodeFile(dparams, compressed, &decoded, pool));
28 ASSERT_THAT(decoded.frames, SizeIs(4));
29
30 int i = 0;
31 for (const ImageBundle& ib : decoded.frames) {
32 std::ostringstream filename;
33 filename << "jxl/blending/cropped_traffic_light_frame-" << i << ".png";
34 const PaddedBytes compressed_frame = ReadTestData(filename.str());
35 CodecInOut frame;
36 ASSERT_TRUE(SetFromBytes(Span<const uint8_t>(compressed_frame), &frame));
37 EXPECT_TRUE(SamePixels(ib.color(), *frame.Main().color()));
38 ++i;
39 }
40 }
41
TEST(BlendingTest,Offset)42 TEST(BlendingTest, Offset) {
43 const PaddedBytes background_bytes = ReadTestData("jxl/splines.png");
44 CodecInOut background;
45 ASSERT_TRUE(SetFromBytes(Span<const uint8_t>(background_bytes), &background));
46 const PaddedBytes foreground_bytes =
47 ReadTestData("jxl/grayscale_patches.png");
48 CodecInOut foreground;
49 ASSERT_TRUE(SetFromBytes(Span<const uint8_t>(foreground_bytes), &foreground));
50
51 ImageBlender blender;
52 ImageBundle output;
53 CodecMetadata nonserialized_metadata;
54 ASSERT_TRUE(
55 nonserialized_metadata.size.Set(background.xsize(), background.ysize()));
56 PassesSharedState state;
57 state.frame_header.blending_info.mode = BlendMode::kReplace;
58 state.frame_header.blending_info.source = 0;
59 state.frame_header.nonserialized_metadata = &nonserialized_metadata;
60 state.metadata = &background.metadata;
61 state.reference_frames[0].frame = &background.Main();
62 PassesDecoderState dec_state;
63 dec_state.shared = &state;
64 const FrameOrigin foreground_origin = {-50, -50};
65 ASSERT_TRUE(blender.PrepareBlending(&dec_state, foreground_origin,
66 foreground.xsize(), foreground.ysize(),
67 background.Main().c_current(), &output));
68
69 static constexpr int kStep = 20;
70 for (size_t x0 = 0; x0 < foreground.xsize(); x0 += kStep) {
71 for (size_t y0 = 0; y0 < foreground.ysize(); y0 += kStep) {
72 const Rect rect =
73 Rect(x0, y0, kStep, kStep).Intersection(Rect(foreground.Main()));
74 Image3F foreground_crop(rect.xsize(), rect.ysize());
75 CopyImageTo(rect, *foreground.Main().color(), Rect(foreground_crop),
76 &foreground_crop);
77 auto rect_blender =
78 blender.PrepareRect(rect, foreground_crop, {}, Rect(foreground_crop));
79 for (size_t y = 0; y < rect.ysize(); ++y) {
80 ASSERT_TRUE(rect_blender.DoBlending(y));
81 }
82 }
83 }
84
85 const PaddedBytes expected_bytes =
86 ReadTestData("jxl/blending/grayscale_patches_on_splines.png");
87 CodecInOut expected;
88 ASSERT_TRUE(SetFromBytes(Span<const uint8_t>(expected_bytes), &expected));
89 VerifyRelativeError(*expected.Main().color(), *output.color(), 1. / (2 * 255),
90 0);
91 }
92
93 } // namespace
94 } // namespace jxl
95
