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Merge pull request #26835 from sturkmen72:patch-4

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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
This commit is contained in:
Suleyman TURKMEN
2025-01-25 09:31:00 +03:00
committed by GitHub
parent a2dd4ddbb2
commit d4eed1c5aa
2 changed files with 46 additions and 15 deletions
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modules/imgcodecs/test/test_animation.cpp
+34 -1
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@@ -425,6 +425,39 @@ TEST(Imgcodecs_APNG, imwriteanimation_rgb)
EXPECT_EQ(0, remove(output.c_str()));
}
TEST(Imgcodecs_APNG, imwriteanimation_gray)
{
Animation s_animation, l_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);
}
s_animation.bgcolor = Scalar(50, 100, 150);
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));
EXPECT_EQ(Scalar(), l_animation.bgcolor);
size_t expected_frame_count = s_animation.frames.size() - 2;
// Verify that the number of frames matches the expected count.
EXPECT_EQ(expected_frame_count, imcount(output));
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;
@@ -492,7 +525,7 @@ TEST(Imgcodecs_APNG, imwriteanimation_bgcolor)
{
Animation s_animation, l_animation;
EXPECT_TRUE(fillFrames(s_animation, true, 2));
s_animation.bgcolor = Scalar(50, 100, 150, 128); // different values for test purpose.
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");