Lines Matching defs:alpha
54 BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha);
66 BOOL alpha = FALSE;
82 alpha = TRUE;
87 fprintf (stderr, "Error: can not create alpha-channel file %s\n", argv[argi]);
144 if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE)
155 /* close alpha file */
156 if (alpha)
180 fprintf (stderr, " -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
188 BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha)
258 /* transform transparency maps into full alpha-channel */
293 /* calculate new number of channels and store alpha-presence */
306 /* check if alpha is expected to be present in file */
307 if (alpha && !alpha_present)
310 fprintf (stderr, "Error: PNG-file doesn't contain alpha channel\n");
360 /* write header of PGM file with alpha channel */
362 if ((alpha) &&
392 if (!alpha)
394 pix_ptr++; /* alpha */
398 else /* output alpha-channel as pgm file */