finish_output_pass jinit_master_decompress jpeg_calc_output_dimensions JPEG_INTERNALS master_selection my_master_ptr prepare_for_output_pass prepare_range_limit_table use_merged_upsample

prepare_range_limit_table ( j_decompress_ptr  cinfo ) Definition at line 231 of file jdmaster.c. Referenced by master_selection(). { JSAMPLE * table; int i; table = (JSAMPLE *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE)); table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */ cinfo->sample_range_limit = table; /* First segment of "simple" table: limit[x] = 0 for x < 0 */ MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE)); /* Main part of "simple" table: limit[x] = x */ for (i = 0; i <= MAXJSAMPLE; i++) table[i] = (JSAMPLE) i; table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */ /* End of simple table, rest of first half of post-IDCT table */ for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++) table[i] = MAXJSAMPLE; /* Second half of post-IDCT table */ MEMZERO(table + (2 * (MAXJSAMPLE+1)), (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE)); MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE), cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE)); }