mirror of
https://github.com/WerWolv/ImHex-Patterns.git
synced 2026-03-28 07:47:02 -05:00
97ccc8c418
* starting to flesh out a pattern for PNG * using defines to improve readability * data type changes to wip png pattern * read png chunks until end of file * iccp chunk and commenting * Move IHDR out of array * Function and pointer fixes Co-authored-by: Foster Brereton <fbrereto@adobe.com>
87 lines
2.3 KiB
Rust
87 lines
2.3 KiB
Rust
#pragma MIME image/png
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#pragma endian big
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struct header_t
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{
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u8 highBitByte;
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char signature[3];
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char dosLineEnding[2];
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char dosEOF;
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char unixLineEnding;
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};
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struct ihdr_t
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{
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u32 width [[comment("Image width")]];
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u32 height [[comment("Image height")]];
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u8 bit_depth;
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u8 color_type [[comment("PNG Image Type\n0: greyscale\n2: truecolour\n3: indexed-color\n4: greyscale with alpha\n6: truecolour with alpha")]];
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u8 compression_method;
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u8 filter_method;
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u8 interlace_method [[comment("values 0 \"no interlace\" or 1 \"Adam7 interlace\"")]];
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};
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struct palette_entry_t {
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u8 r;
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u8 g;
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u8 b;
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};
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struct phys_t {
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u32 ppu_x [[comment("Pixels per unit, X axis")]];
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u32 ppu_y [[comment("Pixels per unit, Y axis")]];
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u8 unit [[comment("Unit Specifier\n0: unit is unknown\n1: unit is the metre")]];
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};
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struct itxt_t {
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char keyword[];
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u8 compression_flag;
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u8 compression_method;
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char language_tag[];
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char translated_keyword[];
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char text[parent.length - ($ - addressof(keyword))];
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};
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struct iccp_t {
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char profile [];
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u8 compression_method;
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u8 compressed_profile[parent.length - ($ - addressof(profile))];
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};
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struct chunk_t {
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u32 length [[color("17BECF")]];
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char type[4];
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#define IHDR_k "IHDR"
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#define PLTE_k "PLTE"
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#define pHYs_k "pHYs"
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#define iTXt_k "iTXt"
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#define IDAT_k "IDAT"
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#define IEND_k "IEND"
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#define gAMA_k "gAMA"
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#define iCCP_k "iCCP"
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if (type == IHDR_k) {
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ihdr_t ihdr [[comment("Image Header chunk"), name("IHDR")]];
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} else if (type == PLTE_k) {
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palette_entry_t entries[length / 3];
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} else if (type == pHYs_k) {
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phys_t phys;
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} else if (type == iTXt_k) {
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itxt_t text;
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} else if (type == gAMA_k) {
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u32 gamma [[name("image gamma"), comment("4 byte unsigned integer representing gamma times 100000")]];
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} else if (type == iCCP_k) {
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iccp_t iccp;
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} else {
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u8 data[length];
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}
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u32 crc;
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};
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header_t header @ 0x00 [[comment("PNG file signature"), name("Signature")]];
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chunk_t ihdr_chunk @ 0x08 [[comment("PNG Header chunk"), name("IHDR")]];
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chunk_t chunk_set[while(builtin::std::mem::read_string($ + 4, 4) != "IEND")] @ $ [[comment("PNG file chunks"), name("Chunks"), inline]];
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chunk_t iend_chunk @ $ [[name("IEND"), comment("Image End Chunk")]];
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