chore: import upstream snapshot with attribution

2026-07-13 12:06:04 +08:00
commit 86c9b1c39f
7743 changed files with 3316339 additions and 0 deletions
@@ -0,0 +1,90 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html
+
+#include "perf_precomp.hpp"
+
+namespace opencv_test
+{
+
+#if defined(HAVE_PNG) || defined(HAVE_SPNG)
+
+using namespace perf;
+
+CV_ENUM(PNGStrategy, IMWRITE_PNG_STRATEGY_DEFAULT, IMWRITE_PNG_STRATEGY_FILTERED, IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY, IMWRITE_PNG_STRATEGY_RLE, IMWRITE_PNG_STRATEGY_FIXED);
+CV_ENUM(PNGFilters, IMWRITE_PNG_FILTER_NONE, IMWRITE_PNG_FILTER_SUB, IMWRITE_PNG_FILTER_UP, IMWRITE_PNG_FILTER_AVG, IMWRITE_PNG_FILTER_PAETH, IMWRITE_PNG_FAST_FILTERS, IMWRITE_PNG_ALL_FILTERS);
+
+typedef perf::TestBaseWithParam<testing::tuple<PNGStrategy, PNGFilters, int>> PNG;
+
+PERF_TEST(PNG, decode)
+{
+    String filename = getDataPath("perf/2560x1600.png");
+
+    FILE *f = fopen(filename.c_str(), "rb");
+    fseek(f, 0, SEEK_END);
+    long len = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    vector<uchar> file_buf((size_t)len);
+    EXPECT_EQ(len, (long)fread(&file_buf[0], 1, (size_t)len, f));
+    fclose(f); f = NULL;
+
+    TEST_CYCLE() imdecode(file_buf, IMREAD_UNCHANGED);
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST(PNG, decode_rgb)
+{
+    String filename = getDataPath("perf/2560x1600.png");
+
+    FILE *f = fopen(filename.c_str(), "rb");
+    fseek(f, 0, SEEK_END);
+    long len = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    vector<uchar> file_buf((size_t)len);
+    EXPECT_EQ(len, (long)fread(&file_buf[0], 1, (size_t)len, f));
+    fclose(f); f = NULL;
+
+    TEST_CYCLE() imdecode(file_buf, IMREAD_COLOR_RGB);
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST(PNG, encode)
+{
+    String filename = getDataPath("perf/2560x1600.png");
+    cv::Mat src = imread(filename);
+
+    vector<uchar> buf;
+    TEST_CYCLE() imencode(".png", src, buf);
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(PNG, params,
+    testing::Combine(
+        testing::Values(IMWRITE_PNG_STRATEGY_DEFAULT, IMWRITE_PNG_STRATEGY_FILTERED, IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY, IMWRITE_PNG_STRATEGY_RLE, IMWRITE_PNG_STRATEGY_FIXED),
+        testing::Values(IMWRITE_PNG_FILTER_NONE, IMWRITE_PNG_FILTER_SUB, IMWRITE_PNG_FILTER_UP, IMWRITE_PNG_FILTER_AVG, IMWRITE_PNG_FILTER_PAETH, IMWRITE_PNG_FAST_FILTERS, IMWRITE_PNG_ALL_FILTERS),
+        testing::Values(1, 6)))
+{
+    String filename = getDataPath("perf/1920x1080.png");
+    const int strategy = get<0>(GetParam());
+    const int filter = get<1>(GetParam());
+    const int level = get<2>(GetParam());
+
+    Mat src = imread(filename);
+    EXPECT_FALSE(src.empty()) << "Cannot open test image perf/1920x1080.png";
+    vector<uchar> buf;
+
+    TEST_CYCLE() imencode(".png", src, buf, { IMWRITE_PNG_COMPRESSION, level, IMWRITE_PNG_STRATEGY, strategy, IMWRITE_PNG_FILTER, filter });
+
+    std::cout << "  Encoded buffer size: " << buf.size()
+        << " bytes, Compression ratio: " << std::fixed << std::setprecision(2)
+        << (static_cast<double>(buf.size()) / (src.total() * src.channels())) * 100.0 << "%" << std::endl;
+
+    SANITY_CHECK_NOTHING();
+}
+
+#endif // HAVE_PNG
+
+} // namespace