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99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html
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#include "test_precomp.hpp"
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namespace opencv_test { namespace {
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#ifdef HAVE_PNG
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TEST(Imgcodecs_Png, write_big)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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const string filename = root + "readwrite/read.png";
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const string dst_file = cv::tempfile(".png");
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Mat img;
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ASSERT_NO_THROW(img = imread(filename));
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ASSERT_FALSE(img.empty());
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EXPECT_EQ(13043, img.cols);
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EXPECT_EQ(13917, img.rows);
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ASSERT_NO_THROW(imwrite(dst_file, img));
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EXPECT_EQ(0, remove(dst_file.c_str()));
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}
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TEST(Imgcodecs_Png, encode)
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{
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vector<uchar> buff;
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Mat img_gt = Mat::zeros(1000, 1000, CV_8U);
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vector<int> param;
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param.push_back(IMWRITE_PNG_COMPRESSION);
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param.push_back(3); //default(3) 0-9.
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EXPECT_NO_THROW(imencode(".png", img_gt, buff, param));
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Mat img;
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EXPECT_NO_THROW(img = imdecode(buff, IMREAD_ANYDEPTH)); // hang
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EXPECT_FALSE(img.empty());
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EXPECT_PRED_FORMAT2(cvtest::MatComparator(0, 0), img, img_gt);
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}
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TEST(Imgcodecs_Png, regression_ImreadVSCvtColor)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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const string imgName = root + "../cv/shared/lena.png";
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Mat original_image = imread(imgName);
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Mat gray_by_codec = imread(imgName, IMREAD_GRAYSCALE);
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Mat gray_by_cvt;
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cvtColor(original_image, gray_by_cvt, COLOR_BGR2GRAY);
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Mat diff;
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absdiff(gray_by_codec, gray_by_cvt, diff);
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EXPECT_LT(cvtest::mean(diff)[0], 1.);
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EXPECT_PRED_FORMAT2(cvtest::MatComparator(10, 0), gray_by_codec, gray_by_cvt);
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}
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// Test OpenCV issue 3075 is solved
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TEST(Imgcodecs_Png, read_color_palette_with_alpha)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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Mat img;
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// First Test : Read PNG with alpha, imread flag -1
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img = imread(root + "readwrite/color_palette_alpha.png", IMREAD_UNCHANGED);
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ASSERT_FALSE(img.empty());
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ASSERT_TRUE(img.channels() == 4);
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// pixel is red in BGRA
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EXPECT_EQ(img.at<Vec4b>(0, 0), Vec4b(0, 0, 255, 255));
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EXPECT_EQ(img.at<Vec4b>(0, 1), Vec4b(0, 0, 255, 255));
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// Second Test : Read PNG without alpha, imread flag -1
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img = imread(root + "readwrite/color_palette_no_alpha.png", IMREAD_UNCHANGED);
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ASSERT_FALSE(img.empty());
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ASSERT_TRUE(img.channels() == 3);
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// pixel is red in BGR
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EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
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EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
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// Third Test : Read PNG with alpha, imread flag 1
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img = imread(root + "readwrite/color_palette_alpha.png", IMREAD_COLOR);
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ASSERT_FALSE(img.empty());
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ASSERT_TRUE(img.channels() == 3);
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// pixel is red in BGR
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EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
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EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
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// Fourth Test : Read PNG without alpha, imread flag 1
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img = imread(root + "readwrite/color_palette_no_alpha.png", IMREAD_COLOR);
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ASSERT_FALSE(img.empty());
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ASSERT_TRUE(img.channels() == 3);
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// pixel is red in BGR
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EXPECT_EQ(img.at<Vec3b>(0, 0), Vec3b(0, 0, 255));
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EXPECT_EQ(img.at<Vec3b>(0, 1), Vec3b(0, 0, 255));
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}
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#endif // HAVE_PNG
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}} // namespace
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