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 */
28 =synopsis i_color black;
29 =synopsis black.rgba.r = black.rgba.g = black.rgba.b = black.rgba.a = 0;
31 Type for 8-bit/sample color.
37 i_color is a union of:
43 gray - contains a single element gray_color, eg. c.gray.gray_color
47 rgb - contains three elements r, g, b, eg. c.rgb.r
51 rgba - contains four elements r, g, b, a, eg. c.rgba.a
55 cmyk - contains four elements c, m, y, k, eg. C<c.cmyk.y>. Note that
56 Imager never uses CMYK colors except when reading/writing files.
60 channels - an array of four channels, eg C<c.channels[2]>.
72 i_sample_t channel[MAXCHANNELS];
76 /* this is the larger sample type, it should be able to accurately represent
77 any sample size we use */
78 typedef double i_fsample_t;
80 typedef struct { i_fsample_t gray_color; } i_fgray_color_t;
81 typedef struct { i_fsample_t r, g, b; } i_frgb_color_t;
82 typedef struct { i_fsample_t r, g, b, a; } i_frgba_color_t;
83 typedef struct { i_fsample_t c, m, y, k; } i_fcmyk_color_t;
89 This is the double/sample color type.
91 Its layout exactly corresponds to i_color.
100 i_fcmyk_color_t cmyk;
101 i_fsample_t channel[MAXCHANNELS];
105 i_direct_type, /* direct colour, keeps RGB values per pixel */
106 i_palette_type /* keeps a palette index per pixel */
110 /* bits per sample, not per pixel */
111 /* a paletted image might have one bit per sample */
114 i_double_bits = sizeof(double) * 8
118 char *name; /* name of a given tag, might be NULL */
119 int code; /* number of a given tag, -1 if it has no meaning */
120 char *data; /* value of a given tag if it's not an int, may be NULL */
121 int size; /* size of the data */
122 int idata; /* value of a given tag if data is NULL */
126 int count; /* how many tags have been set */
127 int alloc; /* how many tags have been allocated for */
131 typedef struct i_img_ i_img;
132 typedef int (*i_f_ppix_t)(i_img *im, int x, int y, const i_color *pix);
133 typedef int (*i_f_ppixf_t)(i_img *im, int x, int y, const i_fcolor *pix);
134 typedef int (*i_f_plin_t)(i_img *im, int x, int r, int y, const i_color *vals);
135 typedef int (*i_f_plinf_t)(i_img *im, int x, int r, int y, const i_fcolor *vals);
136 typedef int (*i_f_gpix_t)(i_img *im, int x, int y, i_color *pix);
137 typedef int (*i_f_gpixf_t)(i_img *im, int x, int y, i_fcolor *pix);
138 typedef int (*i_f_glin_t)(i_img *im, int x, int r, int y, i_color *vals);
139 typedef int (*i_f_glinf_t)(i_img *im, int x, int r, int y, i_fcolor *vals);
141 typedef int (*i_f_gsamp_t)(i_img *im, int x, int r, int y, i_sample_t *samp,
142 const int *chans, int chan_count);
143 typedef int (*i_f_gsampf_t)(i_img *im, int x, int r, int y, i_fsample_t *samp,
144 const int *chan, int chan_count);
146 typedef int (*i_f_gpal_t)(i_img *im, int x, int r, int y, i_palidx *vals);
147 typedef int (*i_f_ppal_t)(i_img *im, int x, int r, int y, const i_palidx *vals);
148 typedef int (*i_f_addcolors_t)(i_img *im, const i_color *colors, int count);
149 typedef int (*i_f_getcolors_t)(i_img *im, int i, i_color *, int count);
150 typedef int (*i_f_colorcount_t)(i_img *im);
151 typedef int (*i_f_maxcolors_t)(i_img *im);
152 typedef int (*i_f_findcolor_t)(i_img *im, const i_color *color, i_palidx *entry);
153 typedef int (*i_f_setcolors_t)(i_img *im, int index, const i_color *colors,
156 typedef void (*i_f_destroy_t)(i_img *im);
158 typedef int (*i_f_gsamp_bits_t)(i_img *im, int x, int r, int y, unsigned *samp,
159 const int *chans, int chan_count, int bits);
160 typedef int (*i_f_psamp_bits_t)(i_img *im, int x, int r, int y, unsigned const *samp,
161 const int *chans, int chan_count, int bits);
166 =synopsis i_img_dim x;
169 A signed integer type that represents an image dimension or ordinate.
171 May be larger than int on some platforms.
175 typedef int i_img_dim;
180 =synopsis i_img *img;
183 This is Imager's image type.
185 It contains the following members:
191 channels - the number of channels in the image
195 xsize, ysize - the width and height of the image in pixels
199 bytes - the number of bytes used to store the image data. Undefined
200 where virtual is non-zero.
204 ch_mask - a mask of writable channels. eg. if this is 6 then only
205 channels 1 and 2 are writable. There may be bits set for which there
206 are no channels in the image.
210 bits - the number of bits stored per sample. Should be one of
211 i_8_bits, i_16_bits, i_double_bits.
215 type - either i_direct_type for direct color images, or i_palette_type
220 virtual - if zero then this image is-self contained. If non-zero then
221 this image could be an interface to some other implementation.
225 idata - the image data. This should not be directly accessed. A new
226 image implementation can use this to store its image data.
227 i_img_destroy() will myfree() this pointer if it's non-null.
231 tags - a structure storing the image's tags. This should only be
232 accessed via the i_tags_*() functions.
236 ext_data - a pointer for use internal to an image implementation.
237 This should be freed by the image's destroy handler.
241 im_data - data internal to Imager. This is initialized by
246 i_f_ppix, i_f_ppixf, i_f_plin, i_f_plinf, i_f_gpix, i_f_gpixf,
247 i_f_glin, i_f_glinf, i_f_gsamp, i_f_gampf - implementations for each
248 of the required image functions. An image implementation should
249 initialize these between calling i_img_alloc() and i_img_init().
253 i_f_gpal, i_f_ppal, i_f_addcolors, i_f_getcolors, i_f_colorcount,
254 i_f_maxcolors, i_f_findcolor, i_f_setcolors - implementations for each
255 paletted image function.
259 i_f_destroy - custom image destruction function. This should be used
260 to release memory if necessary.
264 i_f_gsamp_bits - implements i_gsamp_bits() for this image.
268 i_f_psamp_bits - implements i_psamp_bits() for this image.
277 i_img_dim xsize,ysize;
279 unsigned int ch_mask;
282 int virtual; /* image might not keep any data, must use functions */
283 unsigned char *idata; /* renamed to force inspection of existing code */
284 /* can be NULL if virtual is non-zero */
289 /* interface functions */
291 i_f_ppixf_t i_f_ppixf;
293 i_f_plinf_t i_f_plinf;
295 i_f_gpixf_t i_f_gpixf;
297 i_f_glinf_t i_f_glinf;
298 i_f_gsamp_t i_f_gsamp;
299 i_f_gsampf_t i_f_gsampf;
301 /* only valid for type == i_palette_type */
304 i_f_addcolors_t i_f_addcolors;
305 i_f_getcolors_t i_f_getcolors;
306 i_f_colorcount_t i_f_colorcount;
307 i_f_maxcolors_t i_f_maxcolors;
308 i_f_findcolor_t i_f_findcolor;
309 i_f_setcolors_t i_f_setcolors;
311 i_f_destroy_t i_f_destroy;
314 i_f_gsamp_bits_t i_f_gsamp_bits;
315 i_f_psamp_bits_t i_f_psamp_bits;
320 /* ext_data for paletted images
323 int count; /* amount of space used in palette (in entries) */
324 int alloc; /* amount of space allocated for palette (in entries) */
330 The types in here so far are:
332 doubly linked bucket list - pretty efficient
333 octtree - no idea about goodness
346 struct i_bitmap* btm_new(int xsize,int ysize);
347 void btm_destroy(struct i_bitmap *btm);
348 int btm_test(struct i_bitmap *btm,int x,int y);
349 void btm_set(struct i_bitmap *btm,int x,int y);
352 /* Stack/Linked list */
357 int fill; /* Number used in this link */
362 int multip; /* # of copies in a single chain */
363 int ssize; /* size of each small element */
364 int count; /* number of elements on the list */
370 struct llink *llink_new( struct llink* p,int size );
371 int llist_llink_push( struct llist *lst, struct llink *lnk, void *data );
375 struct llist *llist_new( int multip, int ssize );
376 void llist_destroy( struct llist *l );
377 void llist_push( struct llist *l, void *data );
378 void llist_dump( struct llist *l );
379 int llist_pop( struct llist *l,void *data );
391 struct octt *octt_new(void);
392 int octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b);
393 void octt_dump(struct octt *ct);
394 void octt_count(struct octt *ct,int *tot,int max,int *overflow);
395 void octt_delete(struct octt *ct);
396 void octt_histo(struct octt *ct, unsigned int **col_usage_it_adr);
398 /* font bounding box results */
399 enum bounding_box_index_t {
414 typedef void (*i_fill_with_color_f)
415 (struct i_fill_tag *fill, int x, int y, int width, int channels,
417 typedef void (*i_fill_with_fcolor_f)
418 (struct i_fill_tag *fill, int x, int y, int width, int channels,
420 typedef void (*i_fill_destroy_f)(struct i_fill_tag *fill);
422 /* combine functions modify their target and are permitted to modify
423 the source to prevent having to perform extra copying/memory
425 The out array has I<channels> channels.
427 The in array has I<channels> channels + an alpha channel if one
428 isn't included in I<channels>.
431 typedef void (*i_fill_combine_f)(i_color *out, i_color *in, int channels,
433 typedef void (*i_fill_combinef_f)(i_fcolor *out, i_fcolor *in, int channels,
436 /* fountain fill types */
444 } i_fountain_seg_type;
452 double start, middle, end;
454 i_fountain_seg_type type;
455 i_fountain_color color;
483 =synopsis i_fill_t *fill;
485 This is the "abstract" base type for Imager's fill types.
487 Unless you're implementing a new fill type you'll typically treat this
493 typedef struct i_fill_tag
495 /* called for 8-bit/sample image (and maybe lower) */
496 /* this may be NULL, if so call fill_with_fcolor */
497 i_fill_with_color_f f_fill_with_color;
499 /* called for other sample sizes */
500 /* this must be non-NULL */
501 i_fill_with_fcolor_f f_fill_with_fcolor;
503 /* called if non-NULL to release any extra resources */
504 i_fill_destroy_f destroy;
506 /* if non-zero the caller will fill data with the original data
508 i_fill_combine_f combine;
509 i_fill_combinef_f combinef;
529 describes an axis of a MM font.
530 Modelled on FT2's FT_MM_Axis.
531 It would be nice to have a default entry too, but FT2
534 typedef struct i_font_mm_axis_tag {
540 #define IM_FONT_MM_MAX_AXES 4
543 multiple master information for a font, if any
544 modelled on FT2's FT_Multi_Master.
546 typedef struct i_font_mm_tag {
548 int num_designs; /* provided but not necessarily useful */
549 i_font_mm_axis axis[IM_FONT_MM_MAX_AXES];
554 struct TT_Fonthandle_;
556 typedef struct TT_Fonthandle_ TT_Fonthandle;
562 typedef struct FT2_Fonthandle FT2_Fonthandle;
566 /* transparency handling for quantized output */
567 typedef enum i_transp_tag {
568 tr_none, /* ignore any alpha channel */
569 tr_threshold, /* threshold the transparency - uses tr_threshold */
570 tr_errdiff, /* error diffusion */
571 tr_ordered /* an ordered dither */
574 /* controls how we build the colour map */
575 typedef enum i_make_colors_tag {
576 mc_none, /* user supplied colour map only */
577 mc_web_map, /* Use the 216 colour web colour map */
578 mc_addi, /* Addi's algorithm */
579 mc_median_cut, /* median cut - similar to giflib, hopefully */
580 mc_mono, /* fixed mono color map */
581 mc_mask = 0xFF /* (mask for generator) */
584 /* controls how we translate the colours */
585 typedef enum i_translate_tag {
586 pt_giflib, /* get gif lib to do it (ignores make_colours) */
587 pt_closest, /* just use the closest match within the hashbox */
588 pt_perturb, /* randomly perturb the data - uses perturb_size*/
589 pt_errdiff /* error diffusion dither - uses errdiff */
592 /* Which error diffusion map to use */
593 typedef enum i_errdiff_tag {
594 ed_floyd, /* floyd-steinberg */
595 ed_jarvis, /* Jarvis, Judice and Ninke */
596 ed_stucki, /* Stucki */
597 ed_custom, /* the map found in ed_map|width|height|orig */
598 ed_mask = 0xFF, /* mask to get the map */
599 ed_bidir = 0x100 /* change direction for each row */
602 /* which ordered dither map to use
603 currently only available for transparency
604 I don't know of a way to do ordered dither of an image against some
607 typedef enum i_ord_dith_tag
609 od_random, /* sort of random */
610 od_dot8, /* large dot */
614 od_slashline, /* / line dither */
615 od_backline, /* \ line dither */
616 od_tiny, /* small checkerbox */
617 od_custom /* custom 8x8 map */
620 typedef struct i_gif_pos_tag {
624 /* passed into i_writegif_gen() to control quantization */
625 typedef struct i_quantize_tag {
626 /* how to handle transparency */
628 /* the threshold at which to make pixels opaque */
630 i_errdiff tr_errdiff;
631 i_ord_dith tr_orddith;
632 unsigned char tr_custom[64];
634 /* how to make the colour map */
635 i_make_colors make_colors;
637 /* any existing colours
638 mc_existing is an existing colour table
639 mc_count is the number of existing colours
640 mc_size is the total size of the array that mc_existing points
641 at - this must be at least 256
647 /* how we translate the colours */
648 i_translate translate;
650 /* the error diffusion map to use if translate is mc_errdiff */
652 /* the following define the error diffusion values to use if
653 errdiff is ed_custom. ed_orig is the column on the top row that
654 represents the current
657 int ed_width, ed_height, ed_orig;
659 /* the amount of perturbation to use for translate is mc_perturb */
663 typedef struct i_gif_opts {
664 /* each image has a local color map */
667 /* images are interlaced */
670 /* time for which image is displayed
680 int user_input_count;
681 char *user_input_flags;
688 /* this is added to the color table when we make an image transparent */
691 /* image positions */
693 i_gif_pos *positions;
695 /* Netscape loop extension - number of loops */
698 /* should be eliminate unused colors? */
699 int eliminate_unused;
702 /* distance measures used by some filters */
704 i_dmeasure_euclidean = 0,
705 i_dmeasure_euclidean_squared = 1,
706 i_dmeasure_manhatten = 2,
707 i_dmeasure_limit = 2,
710 #include "iolayert.h"