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#ifndef _DATATYPES_H_
#define _DATATYPES_H_
#include <stddef.h>
#include "imconfig.h"
=item im_context_t
=category Data Types
Imager's per-thread context.
typedef struct im_context_tag *im_context_t;
=item im_slot_t
=category Data Types
Represents a slot in the context object.
typedef ptrdiff_t im_slot_t;
typedef void (*im_slot_destroy_t)(void *);
/* used for palette indices in some internal code (which might be
exposed at some point
typedef unsigned char i_palidx;
/* We handle 2 types of sample, this is hopefully the most common, and the
smaller of the ones we support */
typedef unsigned char i_sample_t;
typedef struct { i_sample_t gray_color; } gray_color;
typedef struct { i_sample_t r,g,b; } rgb_color;
typedef struct { i_sample_t r,g,b,a; } rgba_color;
typedef struct { i_sample_t c,m,y,k; } cmyk_color;
typedef int undef_int; /* special value to put in typemaps to retun undef on 0 and 1 on 1 */
=item i_img_dim
=category Data Types
=synopsis i_img_dim x, y;
=order 90
A signed integer type that represents an image dimension or ordinate.
May be larger than int on some platforms.
typedef ptrdiff_t i_img_dim;
=item i_img_dim_u
=category Data Types
=synopsis i_img_dim_u limit;
=order 90
An unsigned variant of L</i_img_dim>.
typedef size_t i_img_dim_u;
#define i_img_dim_MAX ((i_img_dim)(~(i_img_dim_u)0 >> 1))
=item i_color
=category Data Types
=synopsis i_color black;
=synopsis black.rgba.r = black.rgba.g = black.rgba.b = black.rgba.a = 0;
Type for 8-bit/sample color.
Samples as per;
i_color c;
i_color is a union of:
=item *
gray - contains a single element gray_color, eg. C<c.gray.gray_color>
=item *
C<rgb> - contains three elements C<r>, C<g>, C<b>, eg. C<c.rgb.r>
=item *
C<rgba> - contains four elements C<r>, C<g>, C<b>, C<a>, eg. C<c.rgba.a>
=item *
C<cmyk> - contains four elements C<c>, C<m>, C<y>, C<k>,
eg. C<c.cmyk.y>. Note that Imager never uses CMYK colors except when
reading/writing files.
=item *
channels - an array of four channels, eg C<c.channels[2]>.
typedef union {
gray_color gray;
rgb_color rgb;
rgba_color rgba;
cmyk_color cmyk;
i_sample_t channel[MAXCHANNELS];
unsigned int ui;
} i_color;
/* this is the larger sample type, it should be able to accurately represent
any sample size we use */
typedef double i_fsample_t;
typedef struct { i_fsample_t gray_color; } i_fgray_color_t;
typedef struct { i_fsample_t r, g, b; } i_frgb_color_t;
typedef struct { i_fsample_t r, g, b, a; } i_frgba_color_t;
typedef struct { i_fsample_t c, m, y, k; } i_fcmyk_color_t;
=item i_fcolor
=category Data Types
This is the double/sample color type.
Its layout exactly corresponds to i_color.
typedef union {
i_fgray_color_t gray;
i_frgb_color_t rgb;
i_frgba_color_t rgba;
i_fcmyk_color_t cmyk;
i_fsample_t channel[MAXCHANNELS];
} i_fcolor;
typedef enum {
i_direct_type, /* direct colour, keeps RGB values per pixel */
i_palette_type /* keeps a palette index per pixel */
} i_img_type_t;
typedef enum {
/* bits per sample, not per pixel */
/* a paletted image might have one bit per sample */
i_8_bits = 8,
i_16_bits = 16,
i_double_bits = sizeof(double) * 8
} i_img_bits_t;
typedef struct {
char *name; /* name of a given tag, might be NULL */
int code; /* number of a given tag, -1 if it has no meaning */
char *data; /* value of a given tag if it's not an int, may be NULL */
int size; /* size of the data */
int idata; /* value of a given tag if data is NULL */
} i_img_tag;
typedef struct {
int count; /* how many tags have been set */
int alloc; /* how many tags have been allocated for */
i_img_tag *tags;
} i_img_tags;
typedef struct i_img_ i_img;
typedef int (*i_f_ppix_t)(i_img *im, i_img_dim x, i_img_dim y, const i_color *pix);
typedef int (*i_f_ppixf_t)(i_img *im, i_img_dim x, i_img_dim y, const i_fcolor *pix);
typedef i_img_dim (*i_f_plin_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, const i_color *vals);
typedef i_img_dim (*i_f_plinf_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, const i_fcolor *vals);
typedef int (*i_f_gpix_t)(i_img *im, i_img_dim x, i_img_dim y, i_color *pix);
typedef int (*i_f_gpixf_t)(i_img *im, i_img_dim x, i_img_dim y, i_fcolor *pix);
typedef i_img_dim (*i_f_glin_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, i_color *vals);
typedef i_img_dim (*i_f_glinf_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, i_fcolor *vals);
typedef i_img_dim (*i_f_gsamp_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, i_sample_t *samp,
const int *chans, int chan_count);
typedef i_img_dim (*i_f_gsampf_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, i_fsample_t *samp,
const int *chan, int chan_count);
typedef i_img_dim (*i_f_gpal_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, i_palidx *vals);
typedef i_img_dim (*i_f_ppal_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, const i_palidx *vals);
typedef int (*i_f_addcolors_t)(i_img *im, const i_color *colors, int count);
typedef int (*i_f_getcolors_t)(i_img *im, int i, i_color *, int count);
typedef int (*i_f_colorcount_t)(i_img *im);
typedef int (*i_f_maxcolors_t)(i_img *im);
typedef int (*i_f_findcolor_t)(i_img *im, const i_color *color, i_palidx *entry);
typedef int (*i_f_setcolors_t)(i_img *im, int index, const i_color *colors,
int count);
typedef void (*i_f_destroy_t)(i_img *im);
typedef i_img_dim (*i_f_gsamp_bits_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, unsigned *samp,
const int *chans, int chan_count, int bits);
typedef i_img_dim (*i_f_psamp_bits_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y, unsigned const *samp,
const int *chans, int chan_count, int bits);
typedef i_img_dim
(*i_f_psamp_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y,
const i_sample_t *samp, const int *chan, int chan_count);
typedef i_img_dim
(*i_f_psampf_t)(i_img *im, i_img_dim x, i_img_dim r, i_img_dim y,
const i_fsample_t *samp, const int *chan, int chan_count);
=item i_img
=category Data Types
=synopsis i_img *img;
=order 10
This is Imager's image type.
It contains the following members:
=item *
C<channels> - the number of channels in the image
=item *
C<xsize>, C<ysize> - the width and height of the image in pixels
=item *
C<bytes> - the number of bytes used to store the image data. Undefined
where virtual is non-zero.
=item *
C<ch_mask> - a mask of writable channels. eg. if this is 6 then only
channels 1 and 2 are writable. There may be bits set for which there
are no channels in the image.
=item *
C<bits> - the number of bits stored per sample. Should be one of
i_8_bits, i_16_bits, i_double_bits.
=item *
C<type> - either i_direct_type for direct color images, or i_palette_type
for paletted images.
=item *
C<virtual> - if zero then this image is-self contained. If non-zero
then this image could be an interface to some other implementation.
=item *
C<idata> - the image data. This should not be directly accessed. A new
image implementation can use this to store its image data.
i_img_destroy() will myfree() this pointer if it's non-null.
=item *
C<tags> - a structure storing the image's tags. This should only be
accessed via the i_tags_*() functions.
=item *
C<ext_data> - a pointer for use internal to an image implementation.
This should be freed by the image's destroy handler.
=item *
C<im_data> - data internal to Imager. This is initialized by
=item *
i_f_ppix, i_f_ppixf, i_f_plin, i_f_plinf, i_f_gpix, i_f_gpixf,
i_f_glin, i_f_glinf, i_f_gsamp, i_f_gampf - implementations for each
of the required image functions. An image implementation should
initialize these between calling i_img_alloc() and i_img_init().
=item *
i_f_gpal, i_f_ppal, i_f_addcolors, i_f_getcolors, i_f_colorcount,
i_f_maxcolors, i_f_findcolor, i_f_setcolors - implementations for each
paletted image function.
=item *
i_f_destroy - custom image destruction function. This should be used
to release memory if necessary.
=item *
i_f_gsamp_bits - implements i_gsamp_bits() for this image.
=item *
i_f_psamp_bits - implements i_psamp_bits() for this image.
=item *
i_f_psamp - implements psamp() for this image.
=item *
i_f_psampf - implements psamp() for this image.
=item *
C<im_data> - image specific data internal to Imager.
=item *
C<context> - the Imager API context this image belongs to.
struct i_img_ {
int channels;
i_img_dim xsize,ysize;
size_t bytes;
unsigned int ch_mask;
i_img_bits_t bits;
i_img_type_t type;
int virtual; /* image might not keep any data, must use functions */
unsigned char *idata; /* renamed to force inspection of existing code */
/* can be NULL if virtual is non-zero */
i_img_tags tags;
void *ext_data;
/* interface functions */
i_f_ppix_t i_f_ppix;
i_f_ppixf_t i_f_ppixf;
i_f_plin_t i_f_plin;
i_f_plinf_t i_f_plinf;
i_f_gpix_t i_f_gpix;
i_f_gpixf_t i_f_gpixf;
i_f_glin_t i_f_glin;
i_f_glinf_t i_f_glinf;
i_f_gsamp_t i_f_gsamp;
i_f_gsampf_t i_f_gsampf;
/* only valid for type == i_palette_type */
i_f_gpal_t i_f_gpal;
i_f_ppal_t i_f_ppal;
i_f_addcolors_t i_f_addcolors;
i_f_getcolors_t i_f_getcolors;
i_f_colorcount_t i_f_colorcount;
i_f_maxcolors_t i_f_maxcolors;
i_f_findcolor_t i_f_findcolor;
i_f_setcolors_t i_f_setcolors;
i_f_destroy_t i_f_destroy;
/* as of 0.61 */
i_f_gsamp_bits_t i_f_gsamp_bits;
i_f_psamp_bits_t i_f_psamp_bits;
/* as of 0.88 */
i_f_psamp_t i_f_psamp;
i_f_psampf_t i_f_psampf;
void *im_data;
/* 0.91 */
im_context_t context;
/* ext_data for paletted images
typedef struct {
int count; /* amount of space used in palette (in entries) */
int alloc; /* amount of space allocated for palette (in entries) */
i_color *pal;
int last_found;
} i_img_pal_ext;
/* Helper datatypes
The types in here so far are:
doubly linked bucket list - pretty efficient
octtree - no idea about goodness
needed: hashes.
/* bitmap mask */
struct i_bitmap {
i_img_dim xsize,ysize;
char *data;
struct i_bitmap* btm_new(i_img_dim xsize,i_img_dim ysize);
void btm_destroy(struct i_bitmap *btm);
int btm_test(struct i_bitmap *btm,i_img_dim x,i_img_dim y);
void btm_set(struct i_bitmap *btm,i_img_dim x,i_img_dim y);
/* Stack/Linked list */
struct llink {
struct llink *p,*n;
void *data;
int fill; /* Number used in this link */
struct llist {
struct llink *h,*t;
int multip; /* # of copies in a single chain */
size_t ssize; /* size of each small element */
int count; /* number of elements on the list */
/* Lists */
struct llist *llist_new( int multip, size_t ssize );
void llist_destroy( struct llist *l );
void llist_push( struct llist *l, const void *data );
void llist_dump( struct llist *l );
int llist_pop( struct llist *l,void *data );
/* Octtree */
struct octt {
struct octt *t[8];
int cnt;
struct octt *octt_new(void);
int octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b);
void octt_dump(struct octt *ct);
void octt_count(struct octt *ct,int *tot,int max,int *overflow);
void octt_delete(struct octt *ct);
void octt_histo(struct octt *ct, unsigned int **col_usage_it_adr);
/* font bounding box results */
enum bounding_box_index_t {
=item i_polygon_t
=category Data Types
Represents a polygon. Has the following members:
=item *
C<x>, C<y> - arrays of x and y locations of vertices.
=item *
C<count> - the number of entries in the C<x> and C<y> arrays.
typedef struct i_polygon_tag {
const double *x;
const double *y;
size_t count;
} i_polygon_t;
=item i_poly_fill_mode_t
=category Data Types
Control how polygons are filled. Has the following values:
=item *
C<i_pfm_evenodd> - simple even-odd fills.
=item *
C<i_pfm_nonzero> - non-zero winding rule fills.
typedef enum i_poly_fill_mode_tag {
} i_poly_fill_mode_t;
/* Generic fills */
struct i_fill_tag;
typedef void (*i_fill_with_color_f)
(struct i_fill_tag *fill, i_img_dim x, i_img_dim y, i_img_dim width, int channels,
i_color *data);
typedef void (*i_fill_with_fcolor_f)
(struct i_fill_tag *fill, i_img_dim x, i_img_dim y, i_img_dim width, int channels,
i_fcolor *data);
typedef void (*i_fill_destroy_f)(struct i_fill_tag *fill);
/* combine functions modify their target and are permitted to modify
the source to prevent having to perform extra copying/memory
allocations, etc
The out array has I<channels> channels.
The in array has I<channels> channels + an alpha channel if one
isn't included in I<channels>.
typedef void (*i_fill_combine_f)(i_color *out, i_color *in, int channels,
i_img_dim count);
typedef void (*i_fill_combinef_f)(i_fcolor *out, i_fcolor *in, int channels,
i_img_dim count);
/* fountain fill types */
typedef enum {
} i_fountain_seg_type;
typedef enum {
} i_fountain_color;
typedef struct {
double start, middle, end;
i_fcolor c[2];
i_fountain_seg_type type;
i_fountain_color color;
} i_fountain_seg;
typedef enum {
} i_fountain_repeat;
typedef enum {
} i_fountain_type;
typedef enum {
} i_ft_supersample;
=item i_fill_t
=category Data Types
=synopsis i_fill_t *fill;
This is the "abstract" base type for Imager's fill types.
Unless you're implementing a new fill type you'll typically treat this
as an opaque type.
typedef struct i_fill_tag
/* called for 8-bit/sample image (and maybe lower) */
/* this may be NULL, if so call fill_with_fcolor */
i_fill_with_color_f f_fill_with_color;
/* called for other sample sizes */
/* this must be non-NULL */
i_fill_with_fcolor_f f_fill_with_fcolor;
/* called if non-NULL to release any extra resources */
i_fill_destroy_f destroy;
/* if non-zero the caller will fill data with the original data
from the image */
i_fill_combine_f combine;
i_fill_combinef_f combinef;
} i_fill_t;
typedef enum {
} i_combine_t;
=item i_mutex_t
=category mutex
=synopsis i_mutex_t mutex;
Opaque type for Imager's mutex API.
typedef struct i_mutex_tag *i_mutex_t;
describes an axis of a MM font.
Modelled on FT2's FT_MM_Axis.
It would be nice to have a default entry too, but FT2
doesn't support it.
typedef struct i_font_mm_axis_tag {
char const *name;
int minimum;
int maximum;
} i_font_mm_axis;
multiple master information for a font, if any
modelled on FT2's FT_Multi_Master.
typedef struct i_font_mm_tag {
int num_axis;
int num_designs; /* provided but not necessarily useful */
i_font_mm_axis axis[IM_FONT_MM_MAX_AXES];
} i_font_mm;
struct TT_Fonthandle_;
typedef struct TT_Fonthandle_ TT_Fonthandle;
=item i_transp
=category Data Types
An enumerated type for controlling how transparency is handled during
This has the following possible values:
=item *
C<tr_none> - ignore the alpha channel
=item *
C<tr_threshold> - simple transparency thresholding.
=item *
C<tr_errdiff> - use error diffusion to control which pixels are
=item *
C<tr_ordered> - use ordered dithering to control which pixels are
/* transparency handling for quantized output */
typedef enum i_transp_tag {
tr_none, /* ignore any alpha channel */
tr_threshold, /* threshold the transparency - uses tr_threshold */
tr_errdiff, /* error diffusion */
tr_ordered /* an ordered dither */
} i_transp;
=item i_make_colors
=category Data Types
An enumerated type used to control the method used for produce the
color map:
=item *
C<mc_none> - the user supplied map is used.
=item *
C<mc_web_map> - use the classic web map. Any existing fixed colors
are ignored.
=item *
C<mc_median_cut> - use median cut
=item *
C<mono> - use a fixed black and white map.
=item *
C<gray> - 256 step gray map.
=item *
C<gray4> - 4 step gray map.
=item *
C<gray16> - 16 step gray map.
typedef enum i_make_colors_tag {
mc_none, /* user supplied colour map only */
mc_web_map, /* Use the 216 colour web colour map */
mc_addi, /* Addi's algorithm */
mc_median_cut, /* median cut - similar to giflib, hopefully */
mc_mono, /* fixed mono color map */
mc_gray, /* 256 gray map */
mc_gray4, /* four step gray map */
mc_gray16, /* sixteen step gray map */
mc_mask = 0xFF /* (mask for generator) */
} i_make_colors;
=item i_translate
=category Data Types
An enumerated type that controls how colors are translated:
=item *
C<pt_giflib> - obsolete, forces C<make_colors> to use median cut and
acts like C<pt_closest>.
=item *
C<pt_closest> - always use the closest color.
=item *
C<pt_perturb> - add random values to each sample and find the closest
=item *
C<pt_errdiff> - error diffusion dither.
/* controls how we translate the colours */
typedef enum i_translate_tag {
pt_giflib, /* get gif lib to do it (ignores make_colours) */
pt_closest, /* just use the closest match within the hashbox */
pt_perturb, /* randomly perturb the data - uses perturb_size*/
pt_errdiff /* error diffusion dither - uses errdiff */
} i_translate;
=item i_errdiff
=category Data Types
Controls the type of error diffusion to use:
=item *
C<ed_floyd> - floyd-steinberg
=item *
C<ed_jarvis> - Jarvis, Judice and Ninke
=item *
C<ed_stucki> - Stucki
=item *
C<ed_custom> - not usable for transparency dithering, allows a custom
error diffusion map to be used.
=item *
C<ed_bidir> - or with the error diffusion type to use alternate
directions on each line of the dither.
/* Which error diffusion map to use */
typedef enum i_errdiff_tag {
ed_floyd, /* floyd-steinberg */
ed_jarvis, /* Jarvis, Judice and Ninke */
ed_stucki, /* Stucki */
ed_custom, /* the map found in ed_map|width|height|orig */
ed_mask = 0xFF, /* mask to get the map */
ed_bidir = 0x100 /* change direction for each row */
} i_errdiff;
=item i_ord_dith
=category Data Types
Which ordered dither map to use, currently only available for
transparency. Values are:
=item *
C<od_random> - a pre-generated random map.
=item *
C<od_dot8> - large dot dither.
=item *
C<od_dot4> - smaller dot dither
=item *
C<od_hline> - horizontal line dither.
=item *
C<od_vline> - vertical line dither.
=item *
C<od_slashline> - C</> line dither.
=item *
C<od_backline> - C<\> line dither.
=item *
C<od_tiny> - small checkbox dither
=item *
C<od_custom> - custom dither map.
I don't know of a way to do ordered dither of an image against some
general palette
typedef enum i_ord_dith_tag
od_random, /* sort of random */
od_dot8, /* large dot */
od_slashline, /* / line dither */
od_backline, /* \ line dither */
od_tiny, /* small checkerbox */
od_custom /* custom 8x8 map */
} i_ord_dith;
=item i_quantize
=category Data Types
A structure type used to supply image quantization, ie. when
converting a direct color image to a paletted image.
This has the following members:
=item *
C<transp> - how to handle transparency, see L</i_transp>.
=item *
C<threshold> - when C<transp> is C<tr_threshold>, this is the alpha
level at which pixels become transparent.
=item *
C<tr_errdiff> - when C<transp> is C<tr_errdiff> this controls the type
of error diffusion to be done. This may not be C<ed_custom> for this
=item *
C<tr_orddith> - when C<transp> is C<tr_ordered> this controls the
patten used for dithering transparency.
=item *
C<tr_custom> - when C<tr_orddith> is C<tr_custom> this is the ordered
dither mask.
=item *
C<make_colors> - the method used to generate the color palette, see
=item *
C<mc_colors> - an array of C<mc_size> L</i_color> entries used to
define the fixed colors (controlled by C<mc_count> and to return the
generated color list.
=item *
C<mc_size> - the size of the buffer allocated to C<mc_colors> in
C<sizeof(i_color)> units.
=item *
C<mc_count> - the number of initialized colors in C<mc_colors>.
=item *
C<translate> - how RGB colors are translated to palette indexes, see
=item *
C<errdiff> - when C<translate> is C<pt_errdiff> this controls the type
of error diffusion to be done.
=item *
C<ed_map>, C<ed_width>, C<ed_height>, C<ed_orig> - when C<errdiff> is
C<ed_custom> this controls the error diffusion map. C<ed_map> is an
array of C<ed_width * ed_height> integers. C<ed_orig> is the position
of the current pixel in the error diffusion map, always on the top
=item *
C<perturb> - the amount to perturb pixels when C<translate> is
typedef struct i_quantize_tag {
int version;
/* how to handle transparency */
i_transp transp;
/* the threshold at which to make pixels opaque */
int tr_threshold;
i_errdiff tr_errdiff;
i_ord_dith tr_orddith;
unsigned char tr_custom[64];
/* how to make the colour map */
i_make_colors make_colors;
/* any existing colours
mc_existing is an existing colour table
mc_count is the number of existing colours
mc_size is the total size of the array that mc_existing points
at - this must be at least 256
i_color *mc_colors;
int mc_size;
int mc_count;
/* how we translate the colours */
i_translate translate;
/* the error diffusion map to use if translate is mc_errdiff */
i_errdiff errdiff;
/* the following define the error diffusion values to use if
errdiff is ed_custom. ed_orig is the column on the top row that
represents the current
int *ed_map;
int ed_width, ed_height, ed_orig;
/* the amount of perturbation to use for translate is mc_perturb */
int perturb;
/* version 2 members after here */
} i_quantize;
/* distance measures used by some filters */
enum {
i_dmeasure_euclidean = 0,
i_dmeasure_euclidean_squared = 1,
i_dmeasure_manhatten = 2,
i_dmeasure_limit = 2,
#include "iolayert.h"
/* error message information returned by im_errors() */
typedef struct {
char *msg;
int code;
} i_errmsg;
typedef struct i_render_tag i_render;
=item i_color_model_t
=category Data Types
=order 95
Returned by L</i_img_color_model(im)> to indicate the color model of
the image.
An enumerated type with the following possible values:
=item *
C<icm_unknown> - the image has no usable color data. In future
versions of Imager this will be returned in a few limited cases,
eg. when the source image is CMYK and the user has requested no color
translation is done.
=item *
C<icm_gray> - gray scale with no alpha channel.
=item *
C<icm_gray_alpha> - gray scale with an alpha channel.
=item *
C<icm_rgb> - RGB
=item *
C<icm_rgb_alpha> - RGB with an alpha channel.
typedef enum {
} i_color_model_t;
#define I_FORMAT_ATTR(format_index, va_index) \
__attribute ((format (printf, format_index, va_index)))
#define I_FORMAT_ATTR(format_index, va_index)
#ifdef _MSC_VER
# ifndef vsnprintf
# define vsnprintf _vsnprintf
# endif
# ifndef snprintf
# define snprintf _snprintf
# endif
=item i_DF
=category Data Types
=synopsis printf("left %" i_DF "\n", i_DFc(x));
=order 95
This is a constant string that can be used with functions like
printf() to format i_img_dim values after they're been cast with i_DFc().
Does not include the leading C<%>.
=item i_DFc
=category Data Types
=order 95
Cast an C<i_img_dim> value to a type for use with the i_DF format
=item i_DFp
=category Data Types
=synopsis printf("point (" i_DFp ")\n", i_DFcp(x, y));
=order 95
Format a pair of C<i_img_dim> values. This format string I<does>
include the leading C<%>.
=item i_DFcp
=category Data Types
=order 95
Casts two C<i_img_dim> values for use with the i_DF (or i_DFp) format.
#define i_DFc(x) ((i_dim_format_t)(x))
#define i_DFcp(x, y) i_DFc(x), i_DFc(y)
#define i_DFp "%" i_DF ", %" i_DF
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