10 /* used for palette indices in some internal code (which might be
13 typedef unsigned char i_palidx;
15 /* We handle 2 types of sample, this is hopefully the most common, and the
16 smaller of the ones we support */
17 typedef unsigned char i_sample_t;
19 typedef struct { i_sample_t gray_color; } gray_color;
20 typedef struct { i_sample_t r,g,b; } rgb_color;
21 typedef struct { i_sample_t r,g,b,a; } rgba_color;
22 typedef struct { i_sample_t c,m,y,k; } cmyk_color;
24 typedef int undef_int; /* special value to put in typemaps to retun undef on 0 and 1 on 1 */
29 =synopsis i_color black;
30 =synopsis black.rgba.r = black.rgba.g = black.rgba.b = black.rgba.a = 0;
32 Type for 8-bit/sample color.
38 i_color is a union of:
44 gray - contains a single element gray_color, eg. C<c.gray.gray_color>
48 C<rgb> - contains three elements C<r>, C<g>, C<b>, eg. C<c.rgb.r>
52 C<rgba> - contains four elements C<r>, C<g>, C<b>, C<a>, eg. C<c.rgba.a>
56 C<cmyk> - contains four elements C<c>, C<m>, C<y>, C<k>,
57 eg. C<c.cmyk.y>. Note that Imager never uses CMYK colors except when
58 reading/writing files.
62 channels - an array of four channels, eg C<c.channels[2]>.
74 i_sample_t channel[MAXCHANNELS];
78 /* this is the larger sample type, it should be able to accurately represent
79 any sample size we use */
80 typedef double i_fsample_t;
82 typedef struct { i_fsample_t gray_color; } i_fgray_color_t;
83 typedef struct { i_fsample_t r, g, b; } i_frgb_color_t;
84 typedef struct { i_fsample_t r, g, b, a; } i_frgba_color_t;
85 typedef struct { i_fsample_t c, m, y, k; } i_fcmyk_color_t;
91 This is the double/sample color type.
93 Its layout exactly corresponds to i_color.
101 i_frgba_color_t rgba;
102 i_fcmyk_color_t cmyk;
103 i_fsample_t channel[MAXCHANNELS];
107 i_direct_type, /* direct colour, keeps RGB values per pixel */
108 i_palette_type /* keeps a palette index per pixel */
112 /* bits per sample, not per pixel */
113 /* a paletted image might have one bit per sample */
116 i_double_bits = sizeof(double) * 8
120 char *name; /* name of a given tag, might be NULL */
121 int code; /* number of a given tag, -1 if it has no meaning */
122 char *data; /* value of a given tag if it's not an int, may be NULL */
123 int size; /* size of the data */
124 int idata; /* value of a given tag if data is NULL */
128 int count; /* how many tags have been set */
129 int alloc; /* how many tags have been allocated for */
133 typedef struct i_img_ i_img;
134 typedef int (*i_f_ppix_t)(i_img *im, int x, int y, const i_color *pix);
135 typedef int (*i_f_ppixf_t)(i_img *im, int x, int y, const i_fcolor *pix);
136 typedef int (*i_f_plin_t)(i_img *im, int x, int r, int y, const i_color *vals);
137 typedef int (*i_f_plinf_t)(i_img *im, int x, int r, int y, const i_fcolor *vals);
138 typedef int (*i_f_gpix_t)(i_img *im, int x, int y, i_color *pix);
139 typedef int (*i_f_gpixf_t)(i_img *im, int x, int y, i_fcolor *pix);
140 typedef int (*i_f_glin_t)(i_img *im, int x, int r, int y, i_color *vals);
141 typedef int (*i_f_glinf_t)(i_img *im, int x, int r, int y, i_fcolor *vals);
143 typedef int (*i_f_gsamp_t)(i_img *im, int x, int r, int y, i_sample_t *samp,
144 const int *chans, int chan_count);
145 typedef int (*i_f_gsampf_t)(i_img *im, int x, int r, int y, i_fsample_t *samp,
146 const int *chan, int chan_count);
148 typedef int (*i_f_gpal_t)(i_img *im, int x, int r, int y, i_palidx *vals);
149 typedef int (*i_f_ppal_t)(i_img *im, int x, int r, int y, const i_palidx *vals);
150 typedef int (*i_f_addcolors_t)(i_img *im, const i_color *colors, int count);
151 typedef int (*i_f_getcolors_t)(i_img *im, int i, i_color *, int count);
152 typedef int (*i_f_colorcount_t)(i_img *im);
153 typedef int (*i_f_maxcolors_t)(i_img *im);
154 typedef int (*i_f_findcolor_t)(i_img *im, const i_color *color, i_palidx *entry);
155 typedef int (*i_f_setcolors_t)(i_img *im, int index, const i_color *colors,
158 typedef void (*i_f_destroy_t)(i_img *im);
160 typedef int (*i_f_gsamp_bits_t)(i_img *im, int x, int r, int y, unsigned *samp,
161 const int *chans, int chan_count, int bits);
162 typedef int (*i_f_psamp_bits_t)(i_img *im, int x, int r, int y, unsigned const *samp,
163 const int *chans, int chan_count, int bits);
168 =synopsis i_img_dim x;
171 A signed integer type that represents an image dimension or ordinate.
173 May be larger than int on some platforms.
178 typedef int i_img_dim;
183 =synopsis i_img *img;
186 This is Imager's image type.
188 It contains the following members:
194 C<channels> - the number of channels in the image
198 C<xsize>, C<ysize> - the width and height of the image in pixels
202 C<bytes> - the number of bytes used to store the image data. Undefined
203 where virtual is non-zero.
207 C<ch_mask> - a mask of writable channels. eg. if this is 6 then only
208 channels 1 and 2 are writable. There may be bits set for which there
209 are no channels in the image.
213 C<bits> - the number of bits stored per sample. Should be one of
214 i_8_bits, i_16_bits, i_double_bits.
218 C<type> - either i_direct_type for direct color images, or i_palette_type
223 C<virtual> - if zero then this image is-self contained. If non-zero
224 then this image could be an interface to some other implementation.
228 C<idata> - the image data. This should not be directly accessed. A new
229 image implementation can use this to store its image data.
230 i_img_destroy() will myfree() this pointer if it's non-null.
234 C<tags> - a structure storing the image's tags. This should only be
235 accessed via the i_tags_*() functions.
239 C<ext_data> - a pointer for use internal to an image implementation.
240 This should be freed by the image's destroy handler.
244 C<im_data> - data internal to Imager. This is initialized by
249 i_f_ppix, i_f_ppixf, i_f_plin, i_f_plinf, i_f_gpix, i_f_gpixf,
250 i_f_glin, i_f_glinf, i_f_gsamp, i_f_gampf - implementations for each
251 of the required image functions. An image implementation should
252 initialize these between calling i_img_alloc() and i_img_init().
256 i_f_gpal, i_f_ppal, i_f_addcolors, i_f_getcolors, i_f_colorcount,
257 i_f_maxcolors, i_f_findcolor, i_f_setcolors - implementations for each
258 paletted image function.
262 i_f_destroy - custom image destruction function. This should be used
263 to release memory if necessary.
267 i_f_gsamp_bits - implements i_gsamp_bits() for this image.
271 i_f_psamp_bits - implements i_psamp_bits() for this image.
280 i_img_dim xsize,ysize;
282 unsigned int ch_mask;
285 int virtual; /* image might not keep any data, must use functions */
286 unsigned char *idata; /* renamed to force inspection of existing code */
287 /* can be NULL if virtual is non-zero */
292 /* interface functions */
294 i_f_ppixf_t i_f_ppixf;
296 i_f_plinf_t i_f_plinf;
298 i_f_gpixf_t i_f_gpixf;
300 i_f_glinf_t i_f_glinf;
301 i_f_gsamp_t i_f_gsamp;
302 i_f_gsampf_t i_f_gsampf;
304 /* only valid for type == i_palette_type */
307 i_f_addcolors_t i_f_addcolors;
308 i_f_getcolors_t i_f_getcolors;
309 i_f_colorcount_t i_f_colorcount;
310 i_f_maxcolors_t i_f_maxcolors;
311 i_f_findcolor_t i_f_findcolor;
312 i_f_setcolors_t i_f_setcolors;
314 i_f_destroy_t i_f_destroy;
317 i_f_gsamp_bits_t i_f_gsamp_bits;
318 i_f_psamp_bits_t i_f_psamp_bits;
323 /* ext_data for paletted images
326 int count; /* amount of space used in palette (in entries) */
327 int alloc; /* amount of space allocated for palette (in entries) */
333 The types in here so far are:
335 doubly linked bucket list - pretty efficient
336 octtree - no idea about goodness
349 struct i_bitmap* btm_new(int xsize,int ysize);
350 void btm_destroy(struct i_bitmap *btm);
351 int btm_test(struct i_bitmap *btm,int x,int y);
352 void btm_set(struct i_bitmap *btm,int x,int y);
355 /* Stack/Linked list */
360 int fill; /* Number used in this link */
365 int multip; /* # of copies in a single chain */
366 int ssize; /* size of each small element */
367 int count; /* number of elements on the list */
373 struct llink *llink_new( struct llink* p,int size );
374 int llist_llink_push( struct llist *lst, struct llink *lnk, void *data );
378 struct llist *llist_new( int multip, int ssize );
379 void llist_destroy( struct llist *l );
380 void llist_push( struct llist *l, void *data );
381 void llist_dump( struct llist *l );
382 int llist_pop( struct llist *l,void *data );
394 struct octt *octt_new(void);
395 int octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b);
396 void octt_dump(struct octt *ct);
397 void octt_count(struct octt *ct,int *tot,int max,int *overflow);
398 void octt_delete(struct octt *ct);
399 void octt_histo(struct octt *ct, unsigned int **col_usage_it_adr);
401 /* font bounding box results */
402 enum bounding_box_index_t {
417 typedef void (*i_fill_with_color_f)
418 (struct i_fill_tag *fill, i_img_dim x, i_img_dim y, i_img_dim width, int channels,
420 typedef void (*i_fill_with_fcolor_f)
421 (struct i_fill_tag *fill, i_img_dim x, i_img_dim y, i_img_dim width, int channels,
423 typedef void (*i_fill_destroy_f)(struct i_fill_tag *fill);
425 /* combine functions modify their target and are permitted to modify
426 the source to prevent having to perform extra copying/memory
428 The out array has I<channels> channels.
430 The in array has I<channels> channels + an alpha channel if one
431 isn't included in I<channels>.
434 typedef void (*i_fill_combine_f)(i_color *out, i_color *in, int channels,
436 typedef void (*i_fill_combinef_f)(i_fcolor *out, i_fcolor *in, int channels,
439 /* fountain fill types */
447 } i_fountain_seg_type;
455 double start, middle, end;
457 i_fountain_seg_type type;
458 i_fountain_color color;
486 =synopsis i_fill_t *fill;
488 This is the "abstract" base type for Imager's fill types.
490 Unless you're implementing a new fill type you'll typically treat this
496 typedef struct i_fill_tag
498 /* called for 8-bit/sample image (and maybe lower) */
499 /* this may be NULL, if so call fill_with_fcolor */
500 i_fill_with_color_f f_fill_with_color;
502 /* called for other sample sizes */
503 /* this must be non-NULL */
504 i_fill_with_fcolor_f f_fill_with_fcolor;
506 /* called if non-NULL to release any extra resources */
507 i_fill_destroy_f destroy;
509 /* if non-zero the caller will fill data with the original data
511 i_fill_combine_f combine;
512 i_fill_combinef_f combinef;
532 describes an axis of a MM font.
533 Modelled on FT2's FT_MM_Axis.
534 It would be nice to have a default entry too, but FT2
537 typedef struct i_font_mm_axis_tag {
543 #define IM_FONT_MM_MAX_AXES 4
546 multiple master information for a font, if any
547 modelled on FT2's FT_Multi_Master.
549 typedef struct i_font_mm_tag {
551 int num_designs; /* provided but not necessarily useful */
552 i_font_mm_axis axis[IM_FONT_MM_MAX_AXES];
557 struct TT_Fonthandle_;
559 typedef struct TT_Fonthandle_ TT_Fonthandle;
563 /* transparency handling for quantized output */
564 typedef enum i_transp_tag {
565 tr_none, /* ignore any alpha channel */
566 tr_threshold, /* threshold the transparency - uses tr_threshold */
567 tr_errdiff, /* error diffusion */
568 tr_ordered /* an ordered dither */
571 /* controls how we build the colour map */
572 typedef enum i_make_colors_tag {
573 mc_none, /* user supplied colour map only */
574 mc_web_map, /* Use the 216 colour web colour map */
575 mc_addi, /* Addi's algorithm */
576 mc_median_cut, /* median cut - similar to giflib, hopefully */
577 mc_mono, /* fixed mono color map */
578 mc_mask = 0xFF /* (mask for generator) */
581 /* controls how we translate the colours */
582 typedef enum i_translate_tag {
583 pt_giflib, /* get gif lib to do it (ignores make_colours) */
584 pt_closest, /* just use the closest match within the hashbox */
585 pt_perturb, /* randomly perturb the data - uses perturb_size*/
586 pt_errdiff /* error diffusion dither - uses errdiff */
589 /* Which error diffusion map to use */
590 typedef enum i_errdiff_tag {
591 ed_floyd, /* floyd-steinberg */
592 ed_jarvis, /* Jarvis, Judice and Ninke */
593 ed_stucki, /* Stucki */
594 ed_custom, /* the map found in ed_map|width|height|orig */
595 ed_mask = 0xFF, /* mask to get the map */
596 ed_bidir = 0x100 /* change direction for each row */
599 /* which ordered dither map to use
600 currently only available for transparency
601 I don't know of a way to do ordered dither of an image against some
604 typedef enum i_ord_dith_tag
606 od_random, /* sort of random */
607 od_dot8, /* large dot */
611 od_slashline, /* / line dither */
612 od_backline, /* \ line dither */
613 od_tiny, /* small checkerbox */
614 od_custom /* custom 8x8 map */
617 typedef struct i_gif_pos_tag {
621 /* passed into i_writegif_gen() to control quantization */
622 typedef struct i_quantize_tag {
625 /* how to handle transparency */
627 /* the threshold at which to make pixels opaque */
629 i_errdiff tr_errdiff;
630 i_ord_dith tr_orddith;
631 unsigned char tr_custom[64];
633 /* how to make the colour map */
634 i_make_colors make_colors;
636 /* any existing colours
637 mc_existing is an existing colour table
638 mc_count is the number of existing colours
639 mc_size is the total size of the array that mc_existing points
640 at - this must be at least 256
646 /* how we translate the colours */
647 i_translate translate;
649 /* the error diffusion map to use if translate is mc_errdiff */
651 /* the following define the error diffusion values to use if
652 errdiff is ed_custom. ed_orig is the column on the top row that
653 represents the current
656 int ed_width, ed_height, ed_orig;
658 /* the amount of perturbation to use for translate is mc_perturb */
660 /* version 2 members after here */
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"
712 typedef struct i_render_tag i_render;