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Merge pull request #25691 from redhecker:gifSupport

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[GSoC] Add GIF decode and encode for imgcodecs #25691

this is related to #24855 

we add  gif support for `imread`, `imreadmulti`, `imwrite` and `imwritemulti`

opencv_extra: https://github.com/opencv/opencv_extra/pull/1203

### 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
- [x] 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:
Super
2024-12-07 15:17:41 +08:00
committed by GitHub
parent 7fbf3c1fec
commit 082cd7a74e
9 changed files with 1729 additions and 5 deletions
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modules/imgcodecs/include/opencv2/imgcodecs.hpp
+20 -1
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@@ -111,7 +111,13 @@ enum ImwriteFlags {
IMWRITE_JPEG2000_COMPRESSION_X1000 = 272,//!< For JPEG2000, use to specify the target compression rate (multiplied by 1000). The value can be from 0 to 1000. Default is 1000.
IMWRITE_AVIF_QUALITY = 512,//!< For AVIF, it can be a quality between 0 and 100 (the higher the better). Default is 95.
IMWRITE_AVIF_DEPTH = 513,//!< For AVIF, it can be 8, 10 or 12. If >8, it is stored/read as CV_32F. Default is 8.
IMWRITE_AVIF_SPEED = 514 //!< For AVIF, it is between 0 (slowest) and (fastest). Default is 9.
IMWRITE_AVIF_SPEED = 514,//!< For AVIF, it is between 0 (slowest) and (fastest). Default is 9.
IMWRITE_GIF_LOOP = 1024,//!< For GIF, it can be a loop flag from 0 to 65535. Default is 0 - loop forever.
IMWRITE_GIF_SPEED = 1025,//!< For GIF, it is between 1 (slowest) and 100 (fastest). Default is 96.
IMWRITE_GIF_QUALITY = 1026, //!< For GIF, it can be a quality from 1 to 8. Default is 2. See cv::ImwriteGifCompressionFlags.
IMWRITE_GIF_DITHER = 1027, //!< For GIF, it can be a quality from -1(most dither) to 3(no dither). Default is 0.
IMWRITE_GIF_TRANSPARENCY = 1028, //!< For GIF, the alpha channel lower than this will be set to transparent. Default is 1.
IMWRITE_GIF_COLORTABLE = 1029 //!< For GIF, 0 means global color table is used, 1 means local color table is used. Default is 0.
};
enum ImwriteJPEGSamplingFactorParams {
@@ -216,6 +222,18 @@ enum ImwriteHDRCompressionFlags {
IMWRITE_HDR_COMPRESSION_RLE = 1
};
//! Imwrite GIF specific values for IMWRITE_GIF_QUALITY parameter key, if larger than 3, then its related to the size of the color table.
enum ImwriteGIFCompressionFlags {
IMWRITE_GIF_FAST_NO_DITHER = 1,
IMWRITE_GIF_FAST_FLOYD_DITHER = 2,
IMWRITE_GIF_COLORTABLE_SIZE_8 = 3,
IMWRITE_GIF_COLORTABLE_SIZE_16 = 4,
IMWRITE_GIF_COLORTABLE_SIZE_32 = 5,
IMWRITE_GIF_COLORTABLE_SIZE_64 = 6,
IMWRITE_GIF_COLORTABLE_SIZE_128 = 7,
IMWRITE_GIF_COLORTABLE_SIZE_256 = 8
};
//! @} imgcodecs_flags
/** @brief Loads an image from a file.
@@ -229,6 +247,7 @@ returns an empty matrix.
Currently, the following file formats are supported:
- Windows bitmaps - \*.bmp, \*.dib (always supported)
- GIF files - \*.gif (always supported)
- JPEG files - \*.jpeg, \*.jpg, \*.jpe (see the *Note* section)
- JPEG 2000 files - \*.jp2 (see the *Note* section)
- Portable Network Graphics - \*.png (see the *Note* section)