Peanuts iconset for mac8/28/2023 Compressed ARGB data is not interpreted correctly.But setting il32+icl8 ignores the transparency mask and displays an icon without transparency. Setting is32+ics8 or ih32+ich8 will display a proper icon.Output the next byte (N - 0x80 + 3) timesĮxample: 02 01 02 02 80 03 81 04 82 05 should decompress to 01 02 02 03 03 03 04 04 04 04 05 05 05 05 05 Known issues Īs of macOS 11, there are certain issues / bugs with the file format: The following pseudocode decompresses the data: However, manually crafting icns files with uncompressed 24-bit RGB or ARGB images will not display properly – at least on newer macOS releases (tested on macOS 11). Some sources mention that the OS supports both compressed or uncompressed data chunks. The 24-bit RGB ( is32, il32, ih32, it32, icp4, icp5) and ARGB ( ic04, ic05, icsb) pixel data are compressed (per channel) with a format similar to PackBits. Over time the format has been improved and there is support for compression of some parts of the pixel data. So, if you want to save the data to a file you have to prepend the icns header. The data for all nested icns files does not contain the icns file-header.The table of contents is a list of all contained types (4 byte type-name + 4 byte length).To disk, the icns file header and file size are still required to see the full dark mode icon. Note: The contents of this record is a full. Allows automatic icon switching in Dark mode. Usage unknown (only name field seems to be used). Usage unknown (all tested files use either "icon" or "template" ). The data isn't included in this phase.Ĥ-byte big endian float - equal to the bundle version number of Icon Composer.app that created the icon Each subsequent record (8 bytes each) maps "Table of Contents" a list of all image types in the file, and their sizes (added in Mac OS X 10.7).Ī TOC is written out as an identifier (4 bytes) and size (4 bytes). Therefore, the supported OS version may not be accurate or adjusted based on file format. The support for newer image types seems to be introduced later than the key field (see previous two points).
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