added tests for WebP

modules/highgui/test/test_grfmt.cpp

@@ -332,3 +332,94 @@ TEST(Highgui_Tiff, decode_tile16384x16384)
     remove(file4.c_str());
 }
 #endif
+
+#ifdef HAVE_WEBP
+
+TEST(Highgui_WebP, encode_decode_lossless_webp)
+{
+    cvtest::TS& ts = *cvtest::TS::ptr();
+    std::string input = std::string(ts.get_data_path()) + "../cv/shared/lena.png";
+    cv::Mat img = cv::imread(input);
+    ASSERT_FALSE(img.empty());
+
+    std::string output = cv::tempfile(".webp");
+    EXPECT_NO_THROW(cv::imwrite(output, img)); // lossless
+
+    cv::Mat img_webp = cv::imread(output);
+
+    std::vector<unsigned char> buf;
+
+    FILE * wfile = NULL;
+
+    wfile = fopen(output.c_str(), "rb");
+    if (wfile != NULL)
+    {
+        fseek(wfile, 0, SEEK_END);
+        size_t wfile_size = ftell(wfile);
+        fseek(wfile, 0, SEEK_SET);
+
+        buf.resize(wfile_size);
+
+        size_t data_size = fread(&buf[0], 1, wfile_size, wfile);
+
+        if(wfile)
+        {
+            fclose(wfile);
+        }
+
+        if (data_size != wfile_size)
+        {
+            EXPECT_TRUE(false);
+        }
+    }
+
+    cv::Mat decode = cv::imdecode(buf, CV_LOAD_IMAGE_COLOR);
+    ASSERT_FALSE(decode.empty());
+    EXPECT_TRUE(cv::norm(decode, img_webp, NORM_INF) == 0);
+
+    ASSERT_FALSE(img_webp.empty());
+
+    EXPECT_TRUE(cv::norm(img, img_webp, NORM_INF) == 0);
+}
+
+TEST(Highgui_WebP, encode_decode_lossy_webp)
+{
+    cvtest::TS& ts = *cvtest::TS::ptr();
+    std::string input = std::string(ts.get_data_path()) + "/../cv/shared/lena.png";
+    cv::Mat img = cv::imread(input);
+    ASSERT_FALSE(img.empty());
+
+    for(int q = 100; q>=0; q-=5)
+    {
+        std::vector<int> params;
+        params.push_back(CV_IMWRITE_WEBP_QUALITY);
+        params.push_back(q);
+        string output = cv::tempfile(".webp");
+
+        EXPECT_NO_THROW(cv::imwrite(output, img, params));
+        cv::Mat img_webp = cv::imread(output);
+        EXPECT_FALSE(img_webp.empty());
+    }
+}
+
+TEST(Highgui_WebP, encode_big_image_webp)
+{
+    cvtest::TS& ts = *cvtest::TS::ptr();
+    std::string input = std::string(ts.get_data_path()) + "/../cv/shared/lena.png";
+    cv::Mat img = cv::imread(input);
+    cv::resize(img, img, cv::Size(8192, 8192));
+
+    std::vector<int> params;
+    params.push_back(CV_IMWRITE_WEBP_QUALITY);
+    params.push_back(95);
+
+    std::string output = cv::tempfile(".webp");
+    EXPECT_NO_THROW(cv::imwrite(output, img, params));
+
+    img.create(10000, 10000, CV_8UC3);
+    cv::randu(img, 0, 256);
+    output = cv::tempfile(".webp");
+    EXPECT_NO_THROW(cv::imwrite(output, img));
+}
+
+#endif