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Merge pull request #26849 from sturkmen72:apng-writeanimation

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APNG encoding optimization #26849

related #26840

### 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
This commit is contained in:
Suleyman TURKMEN
2025-03-05 10:42:43 +03:00
committed by GitHub
parent 97abffbdac
commit dbd4e4549d
10 changed files with 155 additions and 72 deletions
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modules/imgcodecs/include/opencv2/imgcodecs.hpp
+12
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@@ -96,6 +96,7 @@ enum ImwriteFlags {
IMWRITE_PNG_COMPRESSION = 16, //!< For PNG, it can be the compression level from 0 to 9. A higher value means a smaller size and longer compression time. If specified, strategy is changed to IMWRITE_PNG_STRATEGY_DEFAULT (Z_DEFAULT_STRATEGY). Default value is 1 (best speed setting).
IMWRITE_PNG_STRATEGY = 17, //!< One of cv::ImwritePNGFlags, default is IMWRITE_PNG_STRATEGY_RLE.
IMWRITE_PNG_BILEVEL = 18, //!< Binary level PNG, 0 or 1, default is 0.
IMWRITE_PNG_FILTER = 19, //!< One of cv::ImwritePNGFilterFlags, default is IMWRITE_PNG_FILTER_SUB.
IMWRITE_PXM_BINARY = 32, //!< For PPM, PGM, or PBM, it can be a binary format flag, 0 or 1. Default value is 1.
IMWRITE_EXR_TYPE = (3 << 4) + 0 /* 48 */, //!< override EXR storage type (FLOAT (FP32) is default)
IMWRITE_EXR_COMPRESSION = (3 << 4) + 1 /* 49 */, //!< override EXR compression type (ZIP_COMPRESSION = 3 is default)
@@ -211,6 +212,17 @@ enum ImwritePNGFlags {
IMWRITE_PNG_STRATEGY_FIXED = 4 //!< Using this value prevents the use of dynamic Huffman codes, allowing for a simpler decoder for special applications.
};
//! Imwrite PNG specific values for IMWRITE_PNG_FILTER parameter key
enum ImwritePNGFilterFlags {
IMWRITE_PNG_FILTER_NONE = 8, //!< Applies no filter to the PNG image (useful when you want to save the raw pixel data without any compression filter).
IMWRITE_PNG_FILTER_SUB = 16, //!< Applies the "sub" filter, which calculates the difference between the current byte and the previous byte in the row.
IMWRITE_PNG_FILTER_UP = 32, //!< applies the "up" filter, which calculates the difference between the current byte and the corresponding byte directly above it.
IMWRITE_PNG_FILTER_AVG = 64, //!< applies the "average" filter, which calculates the average of the byte to the left and the byte above.
IMWRITE_PNG_FILTER_PAETH = 128, //!< applies the "Paeth" filter, a more complex filter that predicts the next pixel value based on neighboring pixels.
IMWRITE_PNG_FAST_FILTERS = (IMWRITE_PNG_FILTER_NONE | IMWRITE_PNG_FILTER_SUB | IMWRITE_PNG_FILTER_UP), //!< This is a combination of IMWRITE_PNG_FILTER_NONE, IMWRITE_PNG_FILTER_SUB, and IMWRITE_PNG_FILTER_UP, typically used for faster compression.
IMWRITE_PNG_ALL_FILTERS = (IMWRITE_PNG_FAST_FILTERS | IMWRITE_PNG_FILTER_AVG | IMWRITE_PNG_FILTER_PAETH) //!< This combines all available filters (NONE, SUB, UP, AVG, and PAETH), which will attempt to apply all of them for the best possible compression.
};
//! Imwrite PAM specific tupletype flags used to define the 'TUPLETYPE' field of a PAM file.
enum ImwritePAMFlags {
IMWRITE_PAM_FORMAT_NULL = 0,