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d4eed1c5aa
Corrections on bKGD chunk writing and reading in PNG #26835 ### 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 - [ ] 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
570 lines
21 KiB
C++
570 lines
21 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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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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static bool fillFrames(Animation& animation, bool hasAlpha, int n = 14)
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{
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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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EXPECT_TRUE(imreadanimation(filename, animation));
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EXPECT_EQ(1000, animation.durations.back());
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if (!hasAlpha)
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cvtColor(animation.frames[0], animation.frames[0], COLOR_BGRA2BGR);
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animation.loop_count = 0xffff; // 0xffff is the maximum value to set.
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// Add the first frame with a duration value of 400 milliseconds.
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int duration = 80;
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animation.durations[0] = duration * 5;
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Mat image = animation.frames[0].clone();
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putText(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)
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Rect roi(2, 16, 26, 16);
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// Modify the ROI in n iterations to simulate slight changes in animation frames.
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for (int i = 1; i < n; i++)
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{
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roi.x++;
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roi.width -= 2;
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RNG rng = theRNG();
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for (int x = roi.x; x < roi.x + roi.width; x++)
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for (int y = roi.y; y < roi.y + roi.height; y++)
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{
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if (hasAlpha)
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{
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Vec4b& pixel = image.at<Vec4b>(y, x);
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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(2, 5);
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if (pixel[1] > 10) pixel[1] -= (uchar)rng.uniform(2, 5);
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if (pixel[2] > 10) pixel[2] -= (uchar)rng.uniform(2, 5);
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pixel[3] -= (uchar)rng.uniform(2, 5);
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}
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}
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else
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{
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Vec3b& pixel = image.at<Vec3b>(y, x);
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if (pixel[0] > 50) pixel[0] -= (uchar)rng.uniform(2, 5);
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if (pixel[1] > 50) pixel[1] -= (uchar)rng.uniform(2, 5);
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if (pixel[2] > 50) pixel[2] -= (uchar)rng.uniform(2, 5);
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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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animation.frames.push_back(image.clone());
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putText(animation.frames[i], format("%d", i), Point(5, 28), FONT_HERSHEY_SIMPLEX, .5, Scalar(100, 255, 0, 255), 2);
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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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if (animation.frames.size() > 1 && animation.frames.size() < 20)
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{
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animation.durations.push_back(++duration);
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animation.frames.push_back(animation.frames.back());
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animation.durations.push_back(++duration);
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animation.frames.push_back(animation.frames.back());
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}
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return true;
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}
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#ifdef HAVE_IMGCODEC_GIF
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TEST(Imgcodecs_Gif, imwriteanimation_rgba)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, true));
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s_animation.bgcolor = Scalar(0, 0, 0, 0); // TO DO not implemented yet.
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// Create a temporary output filename for saving the animation.
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string output = cv::tempfile(".gif");
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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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// Read the animation back and compare with the original.
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EXPECT_TRUE(imreadanimation(output, l_animation));
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size_t expected_frame_count = s_animation.frames.size();
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// Verify that the number of frames matches the expected count.
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EXPECT_EQ(expected_frame_count, imcount(output));
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EXPECT_EQ(expected_frame_count, l_animation.frames.size());
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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(cvRound(s_animation.durations[i] / 10), cvRound(l_animation.durations[i] / 10));
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EXPECT_TRUE(imreadanimation(output, l_animation, 5, 3));
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EXPECT_EQ(expected_frame_count + 3, l_animation.frames.size());
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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[16], NORM_INF));
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[6], l_animation.frames[17], NORM_INF));
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EXPECT_EQ(0, cvtest::norm(l_animation.frames[7], l_animation.frames[18], 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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// 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_IMGCODEC_GIF
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#ifdef HAVE_WEBP
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TEST(Imgcodecs_WebP, imwriteanimation_rgba)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, true));
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s_animation.bgcolor = Scalar(50, 100, 150, 128); // different values for test purpose.
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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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// 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(expected_frame_count, imcount(output));
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EXPECT_EQ(expected_frame_count, l_animation.frames.size());
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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(expected_frame_count + 3, l_animation.frames.size());
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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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// 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, imwriteanimation_rgb)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, false));
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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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// 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(expected_frame_count, imcount(output));
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EXPECT_EQ(expected_frame_count, l_animation.frames.size());
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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(expected_frame_count + 3, l_animation.frames.size());
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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(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, imwritemulti_rgba)
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{
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Animation s_animation;
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EXPECT_TRUE(fillFrames(s_animation, true));
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string output = cv::tempfile(".webp");
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ASSERT_TRUE(imwrite(output, s_animation.frames));
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vector<Mat> read_frames;
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ASSERT_TRUE(imreadmulti(output, read_frames, IMREAD_UNCHANGED));
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EXPECT_EQ(s_animation.frames.size() - 2, read_frames.size());
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EXPECT_EQ(4, s_animation.frames[0].channels());
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EXPECT_EQ(0, remove(output.c_str()));
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}
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TEST(Imgcodecs_WebP, imwritemulti_rgb)
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{
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Animation s_animation;
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EXPECT_TRUE(fillFrames(s_animation, false));
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string output = cv::tempfile(".webp");
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ASSERT_TRUE(imwrite(output, s_animation.frames));
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vector<Mat> read_frames;
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ASSERT_TRUE(imreadmulti(output, read_frames));
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EXPECT_EQ(s_animation.frames.size() - 2, read_frames.size());
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EXPECT_EQ(0, remove(output.c_str()));
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}
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TEST(Imgcodecs_WebP, imencode_rgba)
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{
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Animation s_animation;
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EXPECT_TRUE(fillFrames(s_animation, true, 3));
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std::vector<uchar> buf;
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vector<Mat> apng_frames;
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// Test encoding and decoding the images in memory (without saving to disk).
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EXPECT_TRUE(imencode(".webp", s_animation.frames, buf));
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, apng_frames));
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EXPECT_EQ(s_animation.frames.size() - 2, apng_frames.size());
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}
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#endif // HAVE_WEBP
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#ifdef HAVE_PNG
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TEST(Imgcodecs_APNG, imwriteanimation_rgba)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, true));
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// Create a temporary output filename for saving the animation.
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string output = cv::tempfile(".png");
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// Write the animation to a .png file and verify success.
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EXPECT_TRUE(imwriteanimation(output, 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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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(expected_frame_count, imcount(output));
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EXPECT_EQ(expected_frame_count, l_animation.frames.size());
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for (size_t i = 0; i < l_animation.frames.size() - 1; i++)
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{
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EXPECT_EQ(s_animation.durations[i], l_animation.durations[i]);
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EXPECT_EQ(0, cvtest::norm(s_animation.frames[i], l_animation.frames[i], NORM_INF));
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}
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EXPECT_TRUE(imreadanimation(output, l_animation, 5, 3));
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EXPECT_EQ(expected_frame_count + 3, l_animation.frames.size());
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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> apng_frames;
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, apng_frames));
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EXPECT_EQ(expected_frame_count, apng_frames.size());
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apng_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, apng_frames));
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// Expect all frames written as multi-page image
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EXPECT_EQ(expected_frame_count, apng_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_APNG, imwriteanimation_rgba16u)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, true));
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for (size_t i = 0; i < s_animation.frames.size(); i++)
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{
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s_animation.frames[i].convertTo(s_animation.frames[i], CV_16U, 255);
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}
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// Create a temporary output filename for saving the animation.
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string output = cv::tempfile(".png");
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// Write the animation to a .png file and verify success.
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EXPECT_TRUE(imwriteanimation(output, 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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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(expected_frame_count, imcount(output));
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EXPECT_EQ(expected_frame_count, l_animation.frames.size());
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std::vector<uchar> buf;
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readFileBytes(output, buf);
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vector<Mat> apng_frames;
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EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, apng_frames));
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EXPECT_EQ(expected_frame_count, apng_frames.size());
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apng_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, apng_frames));
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// Expect all frames written as multi-page image
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EXPECT_EQ(expected_frame_count, apng_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_APNG, imwriteanimation_rgb)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, false));
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string output = cv::tempfile(".png");
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// Write the animation to a .png file and verify success.
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EXPECT_TRUE(imwriteanimation(output, 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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EXPECT_EQ(l_animation.frames.size(), s_animation.frames.size() - 2);
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for (size_t i = 0; i < l_animation.frames.size() - 1; i++)
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{
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EXPECT_EQ(0, cvtest::norm(s_animation.frames[i], l_animation.frames[i], NORM_INF));
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}
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EXPECT_EQ(0, remove(output.c_str()));
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}
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TEST(Imgcodecs_APNG, imwriteanimation_gray)
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{
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Animation s_animation, l_animation;
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EXPECT_TRUE(fillFrames(s_animation, false));
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|
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for (size_t i = 0; i < s_animation.frames.size(); i++)
|
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{
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|
cvtColor(s_animation.frames[i], s_animation.frames[i], COLOR_BGR2GRAY);
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}
|
|
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s_animation.bgcolor = Scalar(50, 100, 150);
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string output = cv::tempfile(".png");
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// Write the animation to a .png file and verify success.
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EXPECT_TRUE(imwriteanimation(output, s_animation));
|
|
|
|
// Read the animation back and compare with the original.
|
|
EXPECT_TRUE(imreadanimation(output, l_animation));
|
|
|
|
EXPECT_EQ(Scalar(), l_animation.bgcolor);
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size_t expected_frame_count = s_animation.frames.size() - 2;
|
|
|
|
// Verify that the number of frames matches the expected count.
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|
EXPECT_EQ(expected_frame_count, imcount(output));
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|
EXPECT_EQ(expected_frame_count, l_animation.frames.size());
|
|
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
|
|
for (size_t i = 0; i < l_animation.frames.size(); i++)
|
|
{
|
|
EXPECT_EQ(0, cvtest::norm(s_animation.frames[i], l_animation.frames[i], NORM_INF));
|
|
}
|
|
}
|
|
|
|
TEST(Imgcodecs_APNG, imwritemulti_rgba)
|
|
{
|
|
Animation s_animation;
|
|
EXPECT_TRUE(fillFrames(s_animation, true));
|
|
|
|
string output = cv::tempfile(".png");
|
|
EXPECT_EQ(true, imwrite(output, s_animation.frames));
|
|
vector<Mat> read_frames;
|
|
EXPECT_EQ(true, imreadmulti(output, read_frames, IMREAD_UNCHANGED));
|
|
EXPECT_EQ(read_frames.size(), s_animation.frames.size() - 2);
|
|
EXPECT_EQ(imcount(output), read_frames.size());
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
}
|
|
|
|
TEST(Imgcodecs_APNG, imwritemulti_rgb)
|
|
{
|
|
Animation s_animation;
|
|
EXPECT_TRUE(fillFrames(s_animation, false));
|
|
|
|
string output = cv::tempfile(".png");
|
|
ASSERT_TRUE(imwrite(output, s_animation.frames));
|
|
vector<Mat> read_frames;
|
|
ASSERT_TRUE(imreadmulti(output, read_frames));
|
|
EXPECT_EQ(read_frames.size(), s_animation.frames.size() - 2);
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
|
|
for (size_t i = 0; i < read_frames.size(); i++)
|
|
{
|
|
EXPECT_EQ(0, cvtest::norm(s_animation.frames[i], read_frames[i], NORM_INF));
|
|
}
|
|
}
|
|
|
|
TEST(Imgcodecs_APNG, imwritemulti_gray)
|
|
{
|
|
Animation s_animation;
|
|
EXPECT_TRUE(fillFrames(s_animation, false));
|
|
|
|
for (size_t i = 0; i < s_animation.frames.size(); i++)
|
|
{
|
|
cvtColor(s_animation.frames[i], s_animation.frames[i], COLOR_BGR2GRAY);
|
|
}
|
|
|
|
string output = cv::tempfile(".png");
|
|
EXPECT_TRUE(imwrite(output, s_animation.frames));
|
|
vector<Mat> read_frames;
|
|
EXPECT_TRUE(imreadmulti(output, read_frames));
|
|
EXPECT_EQ(1, read_frames[0].channels());
|
|
read_frames.clear();
|
|
EXPECT_TRUE(imreadmulti(output, read_frames, IMREAD_UNCHANGED));
|
|
EXPECT_EQ(1, read_frames[0].channels());
|
|
read_frames.clear();
|
|
EXPECT_TRUE(imreadmulti(output, read_frames, IMREAD_COLOR));
|
|
EXPECT_EQ(3, read_frames[0].channels());
|
|
read_frames.clear();
|
|
EXPECT_TRUE(imreadmulti(output, read_frames, IMREAD_GRAYSCALE));
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
|
|
for (size_t i = 0; i < read_frames.size(); i++)
|
|
{
|
|
EXPECT_EQ(0, cvtest::norm(s_animation.frames[i], read_frames[i], NORM_INF));
|
|
}
|
|
}
|
|
|
|
TEST(Imgcodecs_APNG, imwriteanimation_bgcolor)
|
|
{
|
|
Animation s_animation, l_animation;
|
|
EXPECT_TRUE(fillFrames(s_animation, true, 2));
|
|
s_animation.bgcolor = Scalar(50, 100, 150); // will be written in bKGD chunk as RGB.
|
|
|
|
// Create a temporary output filename for saving the animation.
|
|
string output = cv::tempfile(".png");
|
|
|
|
// Write the animation to a .png file and verify success.
|
|
EXPECT_TRUE(imwriteanimation(output, s_animation));
|
|
|
|
// Read the animation back and compare with the original.
|
|
EXPECT_TRUE(imreadanimation(output, l_animation));
|
|
|
|
// Check that the background color match between saved and loaded animations.
|
|
EXPECT_EQ(l_animation.bgcolor, s_animation.bgcolor);
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
|
|
EXPECT_TRUE(fillFrames(s_animation, true, 2));
|
|
s_animation.bgcolor = Scalar();
|
|
|
|
output = cv::tempfile(".png");
|
|
EXPECT_TRUE(imwriteanimation(output, s_animation));
|
|
EXPECT_TRUE(imreadanimation(output, l_animation));
|
|
EXPECT_EQ(l_animation.bgcolor, s_animation.bgcolor);
|
|
|
|
EXPECT_EQ(0, remove(output.c_str()));
|
|
}
|
|
|
|
TEST(Imgcodecs_APNG, imencode_rgba)
|
|
{
|
|
Animation s_animation;
|
|
EXPECT_TRUE(fillFrames(s_animation, true, 3));
|
|
|
|
std::vector<uchar> buf;
|
|
vector<Mat> read_frames;
|
|
// Test encoding and decoding the images in memory (without saving to disk).
|
|
EXPECT_TRUE(imencode(".png", s_animation.frames, buf));
|
|
EXPECT_TRUE(imdecodemulti(buf, IMREAD_UNCHANGED, read_frames));
|
|
EXPECT_EQ(read_frames.size(), s_animation.frames.size() - 2);
|
|
}
|
|
|
|
#endif // HAVE_PNG
|
|
|
|
}} // namespace
|