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[imager.git] / imagei.h
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1/* Declares utility functions useful across various files which
2 aren't meant to be available externally
3*/
4
5#ifndef IMAGEI_H_
6#define IMAGEI_H_
7
8#include "image.h"
9
10/* wrapper functions that implement the floating point sample version of a
11 function in terms of the 8-bit sample version
12*/
13extern int i_ppixf_fp(i_img *im, int x, int y, i_fcolor *pix);
14extern int i_gpixf_fp(i_img *im, int x, int y, i_fcolor *pix);
15extern int i_plinf_fp(i_img *im, int l, int r, int y, i_fcolor *pix);
16extern int i_glinf_fp(i_img *im, int l, int r, int y, i_fcolor *pix);
17extern int i_gsampf_fp(i_img *im, int l, int r, int y, i_fsample_t *samp,
18accb2a 18 int const *chans, int chan_count);
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19
20/* wrapper functions that forward palette calls to the underlying image,
21 assuming the underlying image is the first pointer in whatever
22 ext_data points at
23*/
24extern int i_addcolors_forward(i_img *im, i_color *, int count);
25extern int i_getcolors_forward(i_img *im, int i, i_color *, int count);
26extern int i_colorcount_forward(i_img *im);
27extern int i_maxcolors_forward(i_img *im);
28extern int i_findcolor_forward(i_img *im, i_color *color, i_palidx *entry);
29extern int i_setcolors_forward(i_img *im, int index, i_color *colors,
30 int count);
31
32#define SampleFTo16(num) ((int)((num) * 65535.0 + 0.01))
33/* we add that little bit to avoid rounding issues */
34#define Sample16ToF(num) ((num) / 65535.0)
35
36#define SampleFTo8(num) ((int)((num) * 255.0 + 0.01))
37#define Sample8ToF(num) ((num) / 255.0)
38
39#define Sample16To8(num) ((num) / 257)
40#define Sample8To16(num) ((num) * 257)
41
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42extern void i_get_combine(int combine, i_fill_combine_f *, i_fill_combinef_f *);
43
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44#include "ext.h"
45
46extern UTIL_table_t i_UTIL_table;
47
faa9b3e7 48#endif