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);
105 typedef int (*i_f_gsamp_bits_t)(i_img *im, int x, int r, int y, unsigned *samp,
106 const int *chans, int chan_count, int bits);
107 typedef int (*i_f_psamp_bits_t)(i_img *im, int x, int r, int y, unsigned const *samp,
108 const int *chans, int chan_count, int bits);
110 typedef int i_img_dim;
115 =synopsis i_img *img;
117 This is Imager's image type.
119 It contains the following members:
125 channels - the number of channels in the image
129 xsize, ysize - the width and height of the image in pixels
133 bytes - the number of bytes used to store the image data. Undefined
134 where virtual is non-zero.
138 ch_mask - a mask of writable channels. eg. if this is 6 then only
139 channels 1 and 2 are writable. There may be bits set for which there
140 are no channels in the image.
144 bits - the number of bits stored per sample. Should be one of
145 i_8_bits, i_16_bits, i_double_bits.
149 type - either i_direct_type for direct color images, or i_palette_type
154 virtual - if zero then this image is-self contained. If non-zero then
155 this image could be an interface to some other implementation.
159 idata - the image data. This should not be directly accessed. A new
160 image implementation can use this to store its image data.
161 i_img_destroy() will myfree() this pointer if it's non-null.
165 tags - a structure storing the image's tags. This should only be
166 accessed via the i_tags_*() functions.
170 ext_data - a pointer for use internal to an image implementation.
171 This should be freed by the image's destroy handler.
175 im_data - data internal to Imager. This is initialized by
180 i_f_ppix, i_f_ppixf, i_f_plin, i_f_plinf, i_f_gpix, i_f_gpixf,
181 i_f_glin, i_f_glinf, i_f_gsamp, i_f_gampf - implementations for each
182 of the required image functions. An image implementation should
183 initialize these between calling i_img_alloc() and i_img_init().
187 i_f_gpal, i_f_ppal, i_f_addcolors, i_f_getcolors, i_f_colorcount,
188 i_f_maxcolors, i_f_findcolor, i_f_setcolors - implementations for each
189 paletted image function.
193 i_f_destroy - custom image destruction function. This should be used
194 to release memory if necessary.
198 i_f_gsamp_bits - implements i_gsamp_bits() for this image.
202 i_f_psamp_bits - implements i_psamp_bits() for this image.
211 i_img_dim xsize,ysize;
213 unsigned int ch_mask;
216 int virtual; /* image might not keep any data, must use functions */
217 unsigned char *idata; /* renamed to force inspection of existing code */
218 /* can be NULL if virtual is non-zero */
223 /* interface functions */
225 i_f_ppixf_t i_f_ppixf;
227 i_f_plinf_t i_f_plinf;
229 i_f_gpixf_t i_f_gpixf;
231 i_f_glinf_t i_f_glinf;
232 i_f_gsamp_t i_f_gsamp;
233 i_f_gsampf_t i_f_gsampf;
235 /* only valid for type == i_palette_type */
238 i_f_addcolors_t i_f_addcolors;
239 i_f_getcolors_t i_f_getcolors;
240 i_f_colorcount_t i_f_colorcount;
241 i_f_maxcolors_t i_f_maxcolors;
242 i_f_findcolor_t i_f_findcolor;
243 i_f_setcolors_t i_f_setcolors;
245 i_f_destroy_t i_f_destroy;
248 i_f_gsamp_bits_t i_f_gsamp_bits;
249 i_f_psamp_bits_t i_f_psamp_bits;
254 /* ext_data for paletted images
257 int count; /* amount of space used in palette (in entries) */
258 int alloc; /* amount of space allocated for palette (in entries) */
264 The types in here so far are:
266 doubly linked bucket list - pretty efficient
267 octtree - no idea about goodness
284 struct i_bitmap* btm_new(int xsize,int ysize);
285 void btm_destroy(struct i_bitmap *btm);
286 int btm_test(struct i_bitmap *btm,int x,int y);
287 void btm_set(struct i_bitmap *btm,int x,int y);
296 /* Stack/Linked list */
301 int fill; /* Number used in this link */
306 int multip; /* # of copies in a single chain */
307 int ssize; /* size of each small element */
308 int count; /* number of elements on the list */
314 struct llink *llink_new( struct llink* p,int size );
315 int llist_llink_push( struct llist *lst, struct llink *lnk, void *data );
319 struct llist *llist_new( int multip, int ssize );
320 void llist_destroy( struct llist *l );
321 void llist_push( struct llist *l, void *data );
322 void llist_dump( struct llist *l );
323 int llist_pop( struct llist *l,void *data );
335 struct octt *octt_new(void);
336 int octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b);
337 void octt_dump(struct octt *ct);
338 void octt_count(struct octt *ct,int *tot,int max,int *overflow);
339 void octt_delete(struct octt *ct);
340 void octt_histo(struct octt *ct, unsigned int **col_usage_it_adr);
342 /* font bounding box results */
343 enum bounding_box_index_t {
358 typedef void (*i_fill_with_color_f)
359 (struct i_fill_tag *fill, int x, int y, int width, int channels,
361 typedef void (*i_fill_with_fcolor_f)
362 (struct i_fill_tag *fill, int x, int y, int width, int channels,
364 typedef void (*i_fill_destroy_f)(struct i_fill_tag *fill);
366 /* combine functions modify their target and are permitted to modify
367 the source to prevent having to perform extra copying/memory
369 The out array has I<channels> channels.
371 The in array has I<channels> channels + an alpha channel if one
372 isn't included in I<channels>.
375 typedef void (*i_fill_combine_f)(i_color *out, i_color *in, int channels,
377 typedef void (*i_fill_combinef_f)(i_fcolor *out, i_fcolor *in, int channels,
380 /* fountain fill types */
388 } i_fountain_seg_type;
396 double start, middle, end;
398 i_fountain_seg_type type;
399 i_fountain_color color;
425 typedef struct i_fill_tag
427 /* called for 8-bit/sample image (and maybe lower) */
428 /* this may be NULL, if so call fill_with_fcolor */
429 i_fill_with_color_f f_fill_with_color;
431 /* called for other sample sizes */
432 /* this must be non-NULL */
433 i_fill_with_fcolor_f f_fill_with_fcolor;
435 /* called if non-NULL to release any extra resources */
436 i_fill_destroy_f destroy;
438 /* if non-zero the caller will fill data with the original data
440 i_fill_combine_f combine;
441 i_fill_combinef_f combinef;
461 describes an axis of a MM font.
462 Modelled on FT2's FT_MM_Axis.
463 It would be nice to have a default entry too, but FT2
466 typedef struct i_font_mm_axis_tag {
472 #define IM_FONT_MM_MAX_AXES 4
475 multiple master information for a font, if any
476 modelled on FT2's FT_Multi_Master.
478 typedef struct i_font_mm_tag {
480 int num_designs; /* provided but not necessarily useful */
481 i_font_mm_axis axis[IM_FONT_MM_MAX_AXES];
486 struct TT_Fonthandle_;
488 typedef struct TT_Fonthandle_ TT_Fonthandle;
494 typedef struct FT2_Fonthandle FT2_Fonthandle;
498 /* transparency handling for quantized output */
499 typedef enum i_transp_tag {
500 tr_none, /* ignore any alpha channel */
501 tr_threshold, /* threshold the transparency - uses tr_threshold */
502 tr_errdiff, /* error diffusion */
503 tr_ordered /* an ordered dither */
506 /* controls how we build the colour map */
507 typedef enum i_make_colors_tag {
508 mc_none, /* user supplied colour map only */
509 mc_web_map, /* Use the 216 colour web colour map */
510 mc_addi, /* Addi's algorithm */
511 mc_median_cut, /* median cut - similar to giflib, hopefully */
512 mc_mono, /* fixed mono color map */
513 mc_mask = 0xFF /* (mask for generator) */
516 /* controls how we translate the colours */
517 typedef enum i_translate_tag {
518 pt_giflib, /* get gif lib to do it (ignores make_colours) */
519 pt_closest, /* just use the closest match within the hashbox */
520 pt_perturb, /* randomly perturb the data - uses perturb_size*/
521 pt_errdiff /* error diffusion dither - uses errdiff */
524 /* Which error diffusion map to use */
525 typedef enum i_errdiff_tag {
526 ed_floyd, /* floyd-steinberg */
527 ed_jarvis, /* Jarvis, Judice and Ninke */
528 ed_stucki, /* Stucki */
529 ed_custom, /* the map found in ed_map|width|height|orig */
530 ed_mask = 0xFF, /* mask to get the map */
531 ed_bidir = 0x100 /* change direction for each row */
534 /* which ordered dither map to use
535 currently only available for transparency
536 I don't know of a way to do ordered dither of an image against some
539 typedef enum i_ord_dith_tag
541 od_random, /* sort of random */
542 od_dot8, /* large dot */
546 od_slashline, /* / line dither */
547 od_backline, /* \ line dither */
548 od_tiny, /* small checkerbox */
549 od_custom /* custom 8x8 map */
552 typedef struct i_gif_pos_tag {
556 /* passed into i_writegif_gen() to control quantization */
557 typedef struct i_quantize_tag {
558 /* how to handle transparency */
560 /* the threshold at which to make pixels opaque */
562 i_errdiff tr_errdiff;
563 i_ord_dith tr_orddith;
564 unsigned char tr_custom[64];
566 /* how to make the colour map */
567 i_make_colors make_colors;
569 /* any existing colours
570 mc_existing is an existing colour table
571 mc_count is the number of existing colours
572 mc_size is the total size of the array that mc_existing points
573 at - this must be at least 256
579 /* how we translate the colours */
580 i_translate translate;
582 /* the error diffusion map to use if translate is mc_errdiff */
584 /* the following define the error diffusion values to use if
585 errdiff is ed_custom. ed_orig is the column on the top row that
586 represents the current
589 int ed_width, ed_height, ed_orig;
591 /* the amount of perturbation to use for translate is mc_perturb */
595 typedef struct i_gif_opts {
596 /* each image has a local color map */
599 /* images are interlaced */
602 /* time for which image is displayed
612 int user_input_count;
613 char *user_input_flags;
620 /* this is added to the color table when we make an image transparent */
623 /* image positions */
625 i_gif_pos *positions;
627 /* Netscape loop extension - number of loops */
630 /* should be eliminate unused colors? */
631 int eliminate_unused;
634 /* distance measures used by some filters */
636 i_dmeasure_euclidean = 0,
637 i_dmeasure_euclidean_squared = 1,
638 i_dmeasure_manhatten = 2,
639 i_dmeasure_limit = 2,
642 #include "iolayert.h"