1 /* 2 * Common display-related functions. 3 * 4 * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef __DISPLAY_H__ 21 #define __DISPLAY_H__ 22 23 #include <stdint.h> 24 25 26 27 /* Display configuration type. */ 28 29 typedef struct 30 { 31 /* Framebuffer pointer and size. */ 32 33 uint8_t *framebuffer; 34 uint32_t screen_size; 35 uint32_t line_length, line_count; /* width, height */ 36 37 /* Screen start/top and limit pointers. */ 38 39 uint8_t *screen_start, *screen_limit; 40 41 /* Number of scanlines per display line. */ 42 43 int line_multiplier; 44 45 /* Number of consecutive pixels provided by a framebuffer region. */ 46 47 int cell_size; 48 49 /* Display region scanline positions. */ 50 51 uint32_t visible_start, vfp_start, vsync_start, vsync_end; 52 53 } display_config_t; 54 55 56 57 /* Access functions. */ 58 59 int get_position(display_config_t *cfg, int x); 60 void test_linedata(display_config_t *cfg); 61 62 #endif /* __DISPLAY_H__ */