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d9a139f9e8
Animated WebP Support #25608 related issues #24855 #22569 ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake
347 lines
14 KiB
C++
347 lines
14 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_WEBP
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static void readFileBytes(const std::string& fname, std::vector<unsigned char>& buf)
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{
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FILE * wfile = fopen(fname.c_str(), "rb");
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if (wfile != NULL)
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{
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fseek(wfile, 0, SEEK_END);
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size_t wfile_size = ftell(wfile);
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fseek(wfile, 0, SEEK_SET);
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buf.resize(wfile_size);
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size_t data_size = fread(&buf[0], 1, wfile_size, wfile);
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if(wfile)
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{
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fclose(wfile);
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}
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EXPECT_EQ(data_size, wfile_size);
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}
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}
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TEST(Imgcodecs_WebP, encode_decode_lossless_webp)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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string filename = root + "../cv/shared/lena.png";
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cv::Mat img = cv::imread(filename);
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ASSERT_FALSE(img.empty());
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string output = cv::tempfile(".webp");
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EXPECT_NO_THROW(cv::imwrite(output, img)); // lossless
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cv::Mat img_webp = cv::imread(output);
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std::vector<unsigned char> buf;
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readFileBytes(output, buf);
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EXPECT_EQ(0, remove(output.c_str()));
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cv::Mat decode = cv::imdecode(buf, IMREAD_COLOR);
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ASSERT_FALSE(decode.empty());
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EXPECT_TRUE(cvtest::norm(decode, img_webp, NORM_INF) == 0);
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cv::Mat decode_rgb = cv::imdecode(buf, IMREAD_COLOR_RGB);
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ASSERT_FALSE(decode_rgb.empty());
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cvtColor(decode_rgb, decode_rgb, COLOR_RGB2BGR);
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EXPECT_TRUE(cvtest::norm(decode_rgb, img_webp, NORM_INF) == 0);
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ASSERT_FALSE(img_webp.empty());
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EXPECT_TRUE(cvtest::norm(img, img_webp, NORM_INF) == 0);
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}
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TEST(Imgcodecs_WebP, encode_decode_lossy_webp)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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std::string input = root + "../cv/shared/lena.png";
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cv::Mat img = cv::imread(input);
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ASSERT_FALSE(img.empty());
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for(int q = 100; q>=0; q-=20)
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{
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std::vector<int> params;
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params.push_back(IMWRITE_WEBP_QUALITY);
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params.push_back(q);
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string output = cv::tempfile(".webp");
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EXPECT_NO_THROW(cv::imwrite(output, img, params));
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cv::Mat img_webp = cv::imread(output);
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EXPECT_EQ(0, remove(output.c_str()));
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EXPECT_FALSE(img_webp.empty());
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EXPECT_EQ(3, img_webp.channels());
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EXPECT_EQ(512, img_webp.cols);
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EXPECT_EQ(512, img_webp.rows);
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}
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}
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TEST(Imgcodecs_WebP, encode_decode_with_alpha_webp)
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{
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const string root = cvtest::TS::ptr()->get_data_path();
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std::string input = root + "../cv/shared/lena.png";
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cv::Mat img = cv::imread(input);
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ASSERT_FALSE(img.empty());
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std::vector<cv::Mat> imgs;
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cv::split(img, imgs);
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imgs.push_back(cv::Mat(imgs[0]));
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imgs[imgs.size() - 1] = cv::Scalar::all(128);
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cv::merge(imgs, img);
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string output = cv::tempfile(".webp");
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EXPECT_NO_THROW(cv::imwrite(output, img));
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cv::Mat img_webp = cv::imread(output, IMREAD_UNCHANGED);
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cv::Mat img_webp_bgr = cv::imread(output); // IMREAD_COLOR by default
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EXPECT_EQ(0, remove(output.c_str()));
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EXPECT_FALSE(img_webp.empty());
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EXPECT_EQ(4, img_webp.channels());
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EXPECT_EQ(512, img_webp.cols);
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EXPECT_EQ(512, img_webp.rows);
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EXPECT_FALSE(img_webp_bgr.empty());
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EXPECT_EQ(3, img_webp_bgr.channels());
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EXPECT_EQ(512, img_webp_bgr.cols);
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EXPECT_EQ(512, img_webp_bgr.rows);
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}
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TEST(Imgcodecs_WebP, load_save_animation_rgba)
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{
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RNG rng = theRNG();
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// Set the path to the test image directory and filename for loading.
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const string root = cvtest::TS::ptr()->get_data_path();
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const string filename = root + "pngsuite/tp1n3p08.png";
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// Create an Animation object using the default constructor.
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// This initializes the loop count to 0 (infinite looping), background color to 0 (transparent)
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Animation l_animation;
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// Create an Animation object with custom parameters.
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int loop_count = 0xffff; // 0xffff is the maximum value to set.
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Scalar bgcolor(125, 126, 127, 128); // different values for test purpose.
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Animation s_animation(loop_count, bgcolor);
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// Load the image file with alpha channel (IMREAD_UNCHANGED).
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Mat image = imread(filename, IMREAD_UNCHANGED);
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ASSERT_FALSE(image.empty()) << "Failed to load image: " << filename;
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// Add the first frame with a duration value of 500 milliseconds.
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int duration = 100;
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s_animation.durations.push_back(duration * 5);
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s_animation.frames.push_back(image.clone()); // Store the first frame.
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putText(s_animation.frames[0], "0", Point(5, 28), FONT_HERSHEY_SIMPLEX, .5, Scalar(100, 255, 0, 255), 2);
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// Define a region of interest (ROI) in the loaded image for manipulation.
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Mat roi = image(Rect(0, 16, 32, 16)); // Select a subregion of the image.
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// Modify the ROI in 13 iterations to simulate slight changes in animation frames.
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for (int i = 1; i < 14; i++)
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{
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for (int x = 0; x < roi.rows; x++)
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for (int y = 0; y < roi.cols; y++)
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{
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// Apply random changes to pixel values to create animation variations.
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Vec4b& pixel = roi.at<Vec4b>(x, y);
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if (pixel[3] > 0)
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{
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if (pixel[0] > 10) pixel[0] -= (uchar)rng.uniform(3, 10); // Reduce blue channel.
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if (pixel[1] > 10) pixel[1] -= (uchar)rng.uniform(3, 10); // Reduce green channel.
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if (pixel[2] > 10) pixel[2] -= (uchar)rng.uniform(3, 10); // Reduce red channel.
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pixel[3] -= (uchar)rng.uniform(2, 5); // Reduce alpha channel.
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}
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}
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// Update the duration and add the modified frame to the animation.
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duration += rng.uniform(2, 10); // Increase duration with random value (to be sure different duration values saved correctly).
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s_animation.frames.push_back(image.clone());
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putText(s_animation.frames[i], format("%d", i), Point(5, 28), FONT_HERSHEY_SIMPLEX, .5, Scalar(100, 255, 0, 255), 2);
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s_animation.durations.push_back(duration);
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}
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// Add two identical frames with the same duration.
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s_animation.durations.push_back(duration);
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s_animation.frames.push_back(s_animation.frames[13].clone());
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s_animation.durations.push_back(duration);
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s_animation.frames.push_back(s_animation.frames[13].clone());
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// Create a temporary output filename for saving the animation.
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string output = cv::tempfile(".webp");
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// Write the animation to a .webp file and verify success.
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EXPECT_TRUE(imwriteanimation(output, s_animation));
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imwriteanimation("output.webp", s_animation);
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// Read the animation back and compare with the original.
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EXPECT_TRUE(imreadanimation(output, l_animation));
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// Since the last frames are identical, WebP optimizes by storing only one of them,
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// and the duration value for the last frame is handled by libwebp.
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size_t expected_frame_count = s_animation.frames.size() - 2;
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// Verify that the number of frames matches the expected count.
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EXPECT_EQ(imcount(output), expected_frame_count);
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EXPECT_EQ(l_animation.frames.size(), expected_frame_count);
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// Check that the background color and loop count match between saved and loaded animations.
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EXPECT_EQ(l_animation.bgcolor, s_animation.bgcolor); // written as BGRA order
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EXPECT_EQ(l_animation.loop_count, s_animation.loop_count);
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// Verify that the durations of frames match.
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for (size_t i = 0; i < l_animation.frames.size() - 1; i++)
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EXPECT_EQ(s_animation.durations[i], l_animation.durations[i]);
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EXPECT_TRUE(imreadanimation(output, l_animation, 5, 3));
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EXPECT_EQ(l_animation.frames.size(), expected_frame_count + 3);
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EXPECT_EQ(l_animation.frames.size(), l_animation.durations.size());
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[5], l_animation.frames[14], NORM_INF));
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[6], l_animation.frames[15], NORM_INF));
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[7], l_animation.frames[16], NORM_INF));
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// Verify whether the imread function successfully loads the first frame
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Mat frame = imread(output, IMREAD_UNCHANGED);
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[0], frame, NORM_INF));
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std::vector<uchar> buf;
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readFileBytes(output, buf);
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vector<Mat> webp_frames;
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, webp_frames));
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EXPECT_EQ(expected_frame_count, webp_frames.size());
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webp_frames.clear();
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// Test saving the animation frames as individual still images.
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EXPECT_TRUE(imwrite(output, s_animation.frames));
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// Read back the still images into a vector of Mats.
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EXPECT_TRUE(imreadmulti(output, webp_frames));
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// Expect all frames written as multi-page image
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expected_frame_count = 14;
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EXPECT_EQ(expected_frame_count, webp_frames.size());
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// Test encoding and decoding the images in memory (without saving to disk).
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webp_frames.clear();
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EXPECT_TRUE(imencode(".webp", s_animation.frames, buf));
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, webp_frames));
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EXPECT_EQ(expected_frame_count, webp_frames.size());
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// Clean up by removing the temporary file.
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EXPECT_EQ(0, remove(output.c_str()));
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}
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TEST(Imgcodecs_WebP, load_save_animation_rgb)
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{
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RNG rng = theRNG();
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// Set the path to the test image directory and filename for loading.
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const string root = cvtest::TS::ptr()->get_data_path();
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const string filename = root + "pngsuite/tp1n3p08.png";
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// Create an Animation object using the default constructor.
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// This initializes the loop count to 0 (infinite looping), background color to 0 (transparent)
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Animation l_animation;
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// Create an Animation object with custom parameters.
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int loop_count = 0xffff; // 0xffff is the maximum value to set.
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Scalar bgcolor(125, 126, 127, 128); // different values for test purpose.
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Animation s_animation(loop_count, bgcolor);
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// Load the image file without alpha channel
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Mat image = imread(filename);
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ASSERT_FALSE(image.empty()) << "Failed to load image: " << filename;
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// Add the first frame with a duration value of 500 milliseconds.
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int duration = 100;
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s_animation.durations.push_back(duration * 5);
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s_animation.frames.push_back(image.clone()); // Store the first frame.
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putText(s_animation.frames[0], "0", Point(5, 28), FONT_HERSHEY_SIMPLEX, .5, Scalar(100, 255, 0, 255), 2);
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// Define a region of interest (ROI) in the loaded image for manipulation.
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Mat roi = image(Rect(0, 16, 32, 16)); // Select a subregion of the image.
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// Modify the ROI in 13 iterations to simulate slight changes in animation frames.
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for (int i = 1; i < 14; i++)
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{
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for (int x = 0; x < roi.rows; x++)
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for (int y = 0; y < roi.cols; y++)
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{
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// Apply random changes to pixel values to create animation variations.
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Vec3b& pixel = roi.at<Vec3b>(x, y);
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if (pixel[0] > 50) pixel[0] -= (uchar)rng.uniform(3, 10); // Reduce blue channel.
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if (pixel[1] > 50) pixel[1] -= (uchar)rng.uniform(3, 10); // Reduce green channel.
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if (pixel[2] > 50) pixel[2] -= (uchar)rng.uniform(3, 10); // Reduce red channel.
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}
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// Update the duration and add the modified frame to the animation.
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duration += rng.uniform(2, 10); // Increase duration with random value (to be sure different duration values saved correctly).
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s_animation.frames.push_back(image.clone());
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putText(s_animation.frames[i], format("%d", i), Point(5, 28), FONT_HERSHEY_SIMPLEX, .5, Scalar(100, 255, 0, 255), 2);
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s_animation.durations.push_back(duration);
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}
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// Add two identical frames with the same duration.
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s_animation.durations.push_back(duration);
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s_animation.frames.push_back(s_animation.frames[13].clone());
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s_animation.durations.push_back(duration);
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s_animation.frames.push_back(s_animation.frames[13].clone());
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// Create a temporary output filename for saving the animation.
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string output = cv::tempfile(".webp");
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// Write the animation to a .webp file and verify success.
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EXPECT_EQ(true, imwriteanimation(output, s_animation));
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// Read the animation back and compare with the original.
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EXPECT_EQ(true, imreadanimation(output, l_animation));
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// Since the last frames are identical, WebP optimizes by storing only one of them,
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// and the duration value for the last frame is handled by libwebp.
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size_t expected_frame_count = s_animation.frames.size() - 2;
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// Verify that the number of frames matches the expected count.
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EXPECT_EQ(imcount(output), expected_frame_count);
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EXPECT_EQ(l_animation.frames.size(), expected_frame_count);
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// Check that the background color and loop count match between saved and loaded animations.
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EXPECT_EQ(l_animation.bgcolor, s_animation.bgcolor); // written as BGRA order
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EXPECT_EQ(l_animation.loop_count, s_animation.loop_count);
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// Verify that the durations of frames match.
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for (size_t i = 0; i < l_animation.frames.size() - 1; i++)
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EXPECT_EQ(s_animation.durations[i], l_animation.durations[i]);
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EXPECT_EQ(true, imreadanimation(output, l_animation, 5, 3));
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EXPECT_EQ(l_animation.frames.size(), expected_frame_count + 3);
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EXPECT_EQ(l_animation.frames.size(), l_animation.durations.size());
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EXPECT_TRUE(cvtest::norm(l_animation.frames[5], l_animation.frames[14], NORM_INF) == 0);
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EXPECT_TRUE(cvtest::norm(l_animation.frames[6], l_animation.frames[15], NORM_INF) == 0);
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EXPECT_TRUE(cvtest::norm(l_animation.frames[7], l_animation.frames[16], NORM_INF) == 0);
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// Verify whether the imread function successfully loads the first frame
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Mat frame = imread(output, IMREAD_COLOR);
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EXPECT_TRUE(cvtest::norm(l_animation.frames[0], frame, NORM_INF) == 0);
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std::vector<uchar> buf;
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readFileBytes(output, buf);
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vector<Mat> webp_frames;
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, webp_frames));
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EXPECT_EQ(webp_frames.size(), expected_frame_count);
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// Clean up by removing the temporary file.
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EXPECT_EQ(0, remove(output.c_str()));
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}
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#endif // HAVE_WEBP
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}} // namespace
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