Imgcodec: gif: remove unnecessary warning #27169
Close https://github.com/opencv/opencv/issues/27168
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Fix heap buffer overflow and use after free in imgcodecs #27138
This fixes:
- https://g-issues.oss-fuzz.com/issues/405243132
- https://g-issues.oss-fuzz.com/issues/405456349
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GIF: Make sure to resize lzwExtraTable before each block #27081
This fixes https://g-issues.oss-fuzz.com/issues/403364362
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imgcodecs: gif: support animated gif without loop #26971Close#26970
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Make sure there are enough channels to check for opacity #27040
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Test for in-memory animation encoding and decoding #27013
Tests for https://github.com/opencv/opencv/pull/26964
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APNG encoding optimization #26849
related #26840
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Imgcodecs: gif: support Disposal Method #26930
Close https://github.com/opencv/opencv/issues/26924
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Add a test related IMWRITE_PNG_COMPRESSION parameter #26973
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imgcodecs:gif: support IMREAD_UNCHANGED and IMREAD_GRAYSCALE #26859Close#26858
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Performance tests for image encoders and decoders and code cleanup #26872
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Fix oss-fuzz bugs 391934081 and 392318892 #26854
- fix a potential overflow in x0+w0
- use the proper function to deal with background color to deal with all cases of the spec
- use BGR layout for APNG background color
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imgcodecs: jpegxl: imdecode() directly read from memory #26844Close#26843
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Corrections on bKGD chunk writing and reading in PNG #26835
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Fix potential READ memory access #26782
This fixes https://oss-fuzz.com/testcase-detail/4923671881252864 and https://oss-fuzz.com/testcase-detail/5048650127966208
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jpegxl: support cv::IMREAD_UNCHANGED and other ImreadFlags #26788
Close https://github.com/opencv/opencv/issues/26767
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Added CV_WRAP to Animation struct #26813closes#26808
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Fix bugs in GIF decoding #26738
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this is related to #25691
i solved two bugs here:
1. the decoding setting:
according to [https://www.w3.org/Graphics/GIF/spec-gif89a.txt](https://www.w3.org/Graphics/GIF/spec-gif89a.txt)
```
DEFERRED CLEAR CODE IN LZW COMPRESSION
There has been confusion about where clear codes can be found in the
data stream. As the specification says, they may appear at anytime. There
is not a requirement to send a clear code when the string table is full.
It is the encoder's decision as to when the table should be cleared. When
the table is full, the encoder can chose to use the table as is, making no
changes to it until the encoder chooses to clear it. The encoder during
this time sends out codes that are of the maximum Code Size.
As we can see from the above, when the decoder's table is full, it must
not change the table until a clear code is received. The Code Size is that
of the maximum Code Size. Processing other than this is done normally.
Because of a large base of decoders that do not handle the decompression in
this manner, we ask developers of GIF encoding software to NOT implement
this feature until at least January 1991 and later if they see that their
particular market is not ready for it. This will give developers of GIF
decoding software time to implement this feature and to get it into the
hands of their clients before the decoders start "breaking" on the new
GIF's. It is not required that encoders change their software to take
advantage of the deferred clear code, but it is for decoders.
```
at first i didn't consider this case, thus leads to a bug discussed in #25691. the changes made in function lzwDecode() is aiming at solving this.
2. the fetch method of loopCount:
in the codes at https://github.com/opencv/opencv/blob/4.x/modules/imgcodecs/src/grfmt_gif.cpp#L410, if the branch is taken, 3 more bytes will be taken, leading to unpredictable behavior.
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Add more boundary checks. #26739
Also fix a bug in read_chunk where we could end up with png_get_uint_32(len) + 12 < 4
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Fix for png durations and memory leak #26714
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Fix leaks in cv::PngDecoder #26701
Bug: oss-fuzz:386688709
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