144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/*
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* gifp.h
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*
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* Created from parts of old gifin.h
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* John Kilburg (john@cs.unlv.edu)
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*
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* gifin.h
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* kirk johnson
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* november 1989
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* external interface to gifin.c
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*
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* Copyright 1989 Kirk L. Johnson
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* See the file COPYRIGHT for details
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*/
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/*
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* the old gif.h file
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*
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* Copyright (C) 1995, John Kilburg (john@isri.unlv.edu)
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*/
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#define STAB_SIZE 4096 /* string table size */
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#define PSTK_SIZE 4096 /* pixel stack size */
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/*
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* gifState
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*/
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typedef struct _gif_state
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{
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int state; /* state of GIF reader */
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FormatLineProc lineProc; /* line callback */
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void *closure; /* closure for callback */
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Image *image;
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int root_size; /* root code size */
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int clr_code; /* clear code */
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int eoi_code; /* end of information code */
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int code_size; /* current code size */
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int code_mask; /* current code mask */
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int prev_code; /* previous code */
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int first; /* */
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unsigned work_data; /* working bit buffer */
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int work_bits; /* working bit count */
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byte *buf; /* byte buffer */
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int buf_cnt; /* byte count */
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int buf_idx; /* buffer index */
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int table_size; /* string table size */
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int prefix[STAB_SIZE]; /* string table : prefixes */
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int extnsn[STAB_SIZE]; /* string table : extensions */
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byte pstk[PSTK_SIZE]; /* pixel stack */
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int pstk_idx; /* pixel stack pointer */
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int pos; /* current read position */
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byte *data; /* pointer to data */
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int datalen; /* length of data */
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int rast_width; /* raster width */
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int rast_height; /* raster height */
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byte g_cmap_flag; /* global colormap flag */
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int g_pixel_bits; /* bits per pixel, global colormap */
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int g_ncolors; /* number of colors, global colormap */
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int g_ncolors_pos; /* number of colors processed, global colormap */
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Intensity g_cmap[3][256]; /* global colormap */
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int bg_color; /* background color index */
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int color_bits; /* bits of color resolution */
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int transparent; /* transparent color index */
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int img_left; /* image position on raster */
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int img_top; /* image position on raster */
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int img_width; /* image width */
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int img_height; /* image height */
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byte have_dimensions; /* 1 when dimensions known */
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byte l_cmap_flag; /* local colormap flag */
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int l_pixel_bits; /* bits per pixel, local colormap */
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int l_ncolors; /* number of colors, local colormap */
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int l_ncolors_pos; /* number of colors processed, local colormap */
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Intensity l_cmap[3][256]; /* local colormap */
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byte interlace_flag; /* interlace image format flag */
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} gifState;
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/*
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* end of old gif.h file
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*/
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/*
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* gifin return codes
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*/
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#define GS_SUCCESS 0 /* success */
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#define GS_DONE 1 /* no more images */
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#define GS_NEED_DATA 2 /* needs more data */
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#define GS_NEED_DATA_NOR 3 /* needs more data, no rewind */
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#define GS_ERR_BAD_SD -1 /* bad screen descriptor */
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#define GS_ERR_BAD_SEP -2 /* bad image separator */
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#define GS_ERR_BAD_SIG -3 /* bad signature */
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#define GS_ERR_EOD -4 /* unexpected end of raster data */
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#define GS_ERR_EOF -5 /* unexpected end of input stream */
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#define GS_ERR_FAO -6 /* file already open */
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#define GS_ERR_IAO -7 /* image already open */
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#define GS_ERR_NFO -8 /* no file open */
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#define GS_ERR_NIO -9 /* no image open */
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#define GS_ERR_BAD_STATE -10 /* bad state */
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#define GS_ERR_NOMEM -11 /* allocation failure */
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/*
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* colormap indices
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*/
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#define GIF_RED 0
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#define GIF_GRN 1
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#define GIF_BLU 2
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/*
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* #defines, typedefs, and such
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*/
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#define GIF_SIG "GIF87a"
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#define GIF_SIG_89 "GIF89a"
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#define GIF_SIG_LEN 6 /* GIF signature length */
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#define GIF_SD_SIZE 7 /* GIF screen descriptor size */
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#define GIF_ID_SIZE 9 /* GIF image descriptor size */
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#define GIF_SEPARATOR ',' /* GIF image separator */
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#define GIF_EXTENSION '!' /* GIF extension block marker */
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#define GIF_TERMINATOR ';' /* GIF terminator */
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#define NULL_CODE -1 /* string table null code */
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/*
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* GIF states
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*/
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#define GS_OPEN_FILE 0
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#define GS_OPEN_IMAGE 1
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#define GS_LOAD_G_CMAP 2
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#define GS_LOAD_L_CMAP 4
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#define GS_DECODE_DATA 5
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#define GS_MAKE_IMAGE 6
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#define GS_INIT_DECODER 8
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#define GS_READ_SIG 9
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#define GS_READ_IMAGE_HEADER 10
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