9 /* used for palette indices in some internal code (which might be
12 typedef unsigned char i_palidx;
14 /* We handle 2 types of sample, this is hopefully the most common, and the
15 smaller of the ones we support */
16 typedef unsigned char i_sample_t;
18 typedef struct { i_sample_t gray_color; } gray_color;
19 typedef struct { i_sample_t r,g,b; } rgb_color;
20 typedef struct { i_sample_t r,g,b,a; } rgba_color;
21 typedef struct { i_sample_t c,m,y,k; } cmyk_color;
23 typedef int undef_int; /* special value to put in typemaps to retun undef on 0 and 1 on 1 */
30 i_sample_t channel[MAXCHANNELS];
34 /* this is the larger sample type, it should be able to accurately represent
35 any sample size we use */
36 typedef double i_fsample_t;
38 typedef struct { i_fsample_t gray_color; } i_fgray_color_t;
39 typedef struct { i_fsample_t r, g, b; } i_frgb_color_t;
40 typedef struct { i_fsample_t r, g, b, a; } i_frgba_color_t;
41 typedef struct { i_fsample_t c, m, y, k; } i_fcmyk_color_t;
48 i_fsample_t channel[MAXCHANNELS];
52 i_direct_type, /* direct colour, keeps RGB values per pixel */
53 i_palette_type /* keeps a palette index per pixel */
57 /* bits per sample, not per pixel */
58 /* a paletted image might have one bit per sample */
61 i_double_bits = sizeof(double) * 8
65 char *name; /* name of a given tag, might be NULL */
66 int code; /* number of a given tag, -1 if it has no meaning */
67 char *data; /* value of a given tag if it's not an int, may be NULL */
68 int size; /* size of the data */
69 int idata; /* value of a given tag if data is NULL */
73 int count; /* how many tags have been set */
74 int alloc; /* how many tags have been allocated for */
78 typedef struct i_img_ i_img;
79 typedef int (*i_f_ppix_t)(i_img *im, int x, int y, const i_color *pix);
80 typedef int (*i_f_ppixf_t)(i_img *im, int x, int y, const i_fcolor *pix);
81 typedef int (*i_f_plin_t)(i_img *im, int x, int r, int y, const i_color *vals);
82 typedef int (*i_f_plinf_t)(i_img *im, int x, int r, int y, const i_fcolor *vals);
83 typedef int (*i_f_gpix_t)(i_img *im, int x, int y, i_color *pix);
84 typedef int (*i_f_gpixf_t)(i_img *im, int x, int y, i_fcolor *pix);
85 typedef int (*i_f_glin_t)(i_img *im, int x, int r, int y, i_color *vals);
86 typedef int (*i_f_glinf_t)(i_img *im, int x, int r, int y, i_fcolor *vals);
88 typedef int (*i_f_gsamp_t)(i_img *im, int x, int r, int y, i_sample_t *samp,
89 const int *chans, int chan_count);
90 typedef int (*i_f_gsampf_t)(i_img *im, int x, int r, int y, i_fsample_t *samp,
91 const int *chan, int chan_count);
93 typedef int (*i_f_gpal_t)(i_img *im, int x, int r, int y, i_palidx *vals);
94 typedef int (*i_f_ppal_t)(i_img *im, int x, int r, int y, const i_palidx *vals);
95 typedef int (*i_f_addcolors_t)(i_img *im, const i_color *colors, int count);
96 typedef int (*i_f_getcolors_t)(i_img *im, int i, i_color *, int count);
97 typedef int (*i_f_colorcount_t)(i_img *im);
98 typedef int (*i_f_maxcolors_t)(i_img *im);
99 typedef int (*i_f_findcolor_t)(i_img *im, const i_color *color, i_palidx *entry);
100 typedef int (*i_f_setcolors_t)(i_img *im, int index, const i_color *colors,
103 typedef void (*i_f_destroy_t)(i_img *im);
107 int xsize,ysize,bytes;
108 unsigned int ch_mask;
111 int virtual; /* image might not keep any data, must use functions */
112 unsigned char *idata; /* renamed to force inspection of existing code */
113 /* can be NULL if virtual is non-zero */
118 /* interface functions */
120 i_f_ppixf_t i_f_ppixf;
122 i_f_plinf_t i_f_plinf;
124 i_f_gpixf_t i_f_gpixf;
126 i_f_glinf_t i_f_glinf;
127 i_f_gsamp_t i_f_gsamp;
128 i_f_gsampf_t i_f_gsampf;
130 /* only valid for type == i_palette_type */
133 i_f_addcolors_t i_f_addcolors;
134 i_f_getcolors_t i_f_getcolors;
135 i_f_colorcount_t i_f_colorcount;
136 i_f_maxcolors_t i_f_maxcolors;
137 i_f_findcolor_t i_f_findcolor;
138 i_f_setcolors_t i_f_setcolors;
140 i_f_destroy_t i_f_destroy;
143 /* ext_data for paletted images
146 int count; /* amount of space used in palette (in entries) */
147 int alloc; /* amount of space allocated for palette (in entries) */
153 The types in here so far are:
155 doubly linked bucket list - pretty efficient
156 octtree - no idea about goodness
173 struct i_bitmap* btm_new(int xsize,int ysize);
174 void btm_destroy(struct i_bitmap *btm);
175 int btm_test(struct i_bitmap *btm,int x,int y);
176 void btm_set(struct i_bitmap *btm,int x,int y);
185 /* Stack/Linked list */
190 int fill; /* Number used in this link */
195 int multip; /* # of copies in a single chain */
196 int ssize; /* size of each small element */
197 int count; /* number of elements on the list */
203 struct llink *llink_new( struct llink* p,int size );
204 int llist_llink_push( struct llist *lst, struct llink *lnk, void *data );
208 struct llist *llist_new( int multip, int ssize );
209 void llist_destroy( struct llist *l );
210 void llist_push( struct llist *l, void *data );
211 void llist_dump( struct llist *l );
212 int llist_pop( struct llist *l,void *data );
224 struct octt *octt_new(void);
225 int octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b);
226 void octt_dump(struct octt *ct);
227 void octt_count(struct octt *ct,int *tot,int max,int *overflow);
228 void octt_delete(struct octt *ct);
230 /* font bounding box results */
231 enum bounding_box_index_t {
246 typedef void (*i_fill_with_color_f)
247 (struct i_fill_tag *fill, int x, int y, int width, int channels,
249 typedef void (*i_fill_with_fcolor_f)
250 (struct i_fill_tag *fill, int x, int y, int width, int channels,
252 typedef void (*i_fill_destroy_f)(struct i_fill_tag *fill);
253 typedef void (*i_fill_combine_f)(i_color *out, i_color *in, int channels,
255 typedef void (*i_fill_combinef_f)(i_fcolor *out, i_fcolor *in, int channels,
258 /* fountain fill types */
266 } i_fountain_seg_type;
274 double start, middle, end;
276 i_fountain_seg_type type;
277 i_fountain_color color;
303 typedef struct i_fill_tag
305 /* called for 8-bit/sample image (and maybe lower) */
306 /* this may be NULL, if so call fill_with_fcolor */
307 i_fill_with_color_f fill_with_color;
309 /* called for other sample sizes */
310 /* this must be non-NULL */
311 i_fill_with_fcolor_f fill_with_fcolor;
313 /* called if non-NULL to release any extra resources */
314 i_fill_destroy_f destroy;
316 /* if non-zero the caller will fill data with the original data
318 i_fill_combine_f combine;
319 i_fill_combinef_f combinef;
339 describes an axis of a MM font.
340 Modelled on FT2's FT_MM_Axis.
341 It would be nice to have a default entry too, but FT2
344 typedef struct i_font_mm_axis_tag {
350 #define IM_FONT_MM_MAX_AXES 4
353 multiple master information for a font, if any
354 modelled on FT2's FT_Multi_Master.
356 typedef struct i_font_mm_tag {
358 int num_designs; /* provided but not necessarily useful */
359 i_font_mm_axis axis[IM_FONT_MM_MAX_AXES];
364 struct TT_Fonthandle_;
366 typedef struct TT_Fonthandle_ TT_Fonthandle;
372 typedef struct FT2_Fonthandle FT2_Fonthandle;
376 /* transparency handling for quantized output */
377 typedef enum i_transp_tag {
378 tr_none, /* ignore any alpha channel */
379 tr_threshold, /* threshold the transparency - uses tr_threshold */
380 tr_errdiff, /* error diffusion */
381 tr_ordered /* an ordered dither */
384 /* controls how we build the colour map */
385 typedef enum i_make_colors_tag {
386 mc_none, /* user supplied colour map only */
387 mc_web_map, /* Use the 216 colour web colour map */
388 mc_addi, /* Addi's algorithm */
389 mc_median_cut, /* median cut - similar to giflib, hopefully */
390 mc_mono, /* fixed mono color map */
391 mc_mask = 0xFF /* (mask for generator) */
394 /* controls how we translate the colours */
395 typedef enum i_translate_tag {
396 pt_giflib, /* get gif lib to do it (ignores make_colours) */
397 pt_closest, /* just use the closest match within the hashbox */
398 pt_perturb, /* randomly perturb the data - uses perturb_size*/
399 pt_errdiff /* error diffusion dither - uses errdiff */
402 /* Which error diffusion map to use */
403 typedef enum i_errdiff_tag {
404 ed_floyd, /* floyd-steinberg */
405 ed_jarvis, /* Jarvis, Judice and Ninke */
406 ed_stucki, /* Stucki */
407 ed_custom, /* the map found in ed_map|width|height|orig */
408 ed_mask = 0xFF, /* mask to get the map */
409 ed_bidir = 0x100 /* change direction for each row */
412 /* which ordered dither map to use
413 currently only available for transparency
414 I don't know of a way to do ordered dither of an image against some
417 typedef enum i_ord_dith_tag
419 od_random, /* sort of random */
420 od_dot8, /* large dot */
424 od_slashline, /* / line dither */
425 od_backline, /* \ line dither */
426 od_tiny, /* small checkerbox */
427 od_custom /* custom 8x8 map */
430 typedef struct i_gif_pos_tag {
434 /* passed into i_writegif_gen() to control quantization */
435 typedef struct i_quantize_tag {
436 /* how to handle transparency */
438 /* the threshold at which to make pixels opaque */
440 i_errdiff tr_errdiff;
441 i_ord_dith tr_orddith;
442 unsigned char tr_custom[64];
444 /* how to make the colour map */
445 i_make_colors make_colors;
447 /* any existing colours
448 mc_existing is an existing colour table
449 mc_count is the number of existing colours
450 mc_size is the total size of the array that mc_existing points
451 at - this must be at least 256
457 /* how we translate the colours */
458 i_translate translate;
460 /* the error diffusion map to use if translate is mc_errdiff */
462 /* the following define the error diffusion values to use if
463 errdiff is ed_custom. ed_orig is the column on the top row that
464 represents the current
467 int ed_width, ed_height, ed_orig;
469 /* the amount of perturbation to use for translate is mc_perturb */
473 typedef struct i_gif_opts {
474 /* each image has a local color map */
477 /* images are interlaced */
480 /* time for which image is displayed
490 int user_input_count;
491 char *user_input_flags;
498 /* this is added to the color table when we make an image transparent */
501 /* image positions */
503 i_gif_pos *positions;
505 /* Netscape loop extension - number of loops */
508 /* should be eliminate unused colors? */
509 int eliminate_unused;
512 /* distance measures used by some filters */
514 i_dmeasure_euclidean = 0,
515 i_dmeasure_euclidean_squared = 1,
516 i_dmeasure_manhatten = 2,
517 i_dmeasure_limit = 2,
520 #include "iolayert.h"