15 #define FRAMEBUFFER_SIZE(xsz, ysz, bpp) ((xsz) * (ysz) * (bpp) / CHAR_BIT)
17 static unsigned char *framebuffer;
18 static int dev_fd = -1;
20 static Rect screen_rect;
21 static int color_depth; //bits per pixel
25 if((dev_fd = open("/dev/fb0", O_RDWR)) == -1) {
26 fprintf(stderr, "Cannot open /dev/fb0 : %s\n", strerror(errno));
30 fb_var_screeninfo sinfo;
31 if(ioctl(dev_fd, FBIOGET_VSCREENINFO, &sinfo) == -1) {
34 fprintf(stderr, "Unable to get screen info : %s\n", strerror(errno));
38 printf("width : %d height : %d\n : bpp : %d\n", sinfo.xres, sinfo.yres, sinfo.bits_per_pixel);
39 printf("virtual w: %d virtual h: %d\n", sinfo.xres_virtual, sinfo.yres_virtual);
41 screen_rect.x = screen_rect.y = 0;
42 screen_rect.width = sinfo.xres_virtual;
43 screen_rect.height = sinfo.yres_virtual;
44 color_depth = sinfo.bits_per_pixel;
46 int sz = FRAMEBUFFER_SIZE(screen_rect.width, screen_rect.height, color_depth);
47 framebuffer = (unsigned char*)mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED, dev_fd, 0);
49 if(framebuffer == (void*)-1) {
52 fprintf(stderr, "Cannot map the framebuffer to memory : %s\n", strerror(errno));
61 clear_screen(0, 0, 0);
69 munmap(framebuffer, FRAMEBUFFER_SIZE(screen_rect.width, screen_rect.height, color_depth));
73 unsigned char *get_framebuffer()
78 Rect get_screen_size()
88 void clear_screen(int r, int g, int b)
90 fill_rect(screen_rect, r, g, b);
93 void fill_rect(const Rect &rect, int r, int g, int b)
95 unsigned char *fb = framebuffer + (rect.x + screen_rect.width * rect.y) * 4;
96 for(int i=0; i<rect.height; i++) {
97 for(int j=0; j<rect.width; j++) {
102 fb += screen_rect.width * 4;
106 void set_cursor_visibility(bool visible)
109 curs.enable = visible ? 1 : 0;
111 if(ioctl(dev_fd, FBIO_CURSOR, &curs) == -1) {
112 fprintf(stderr, "Cannot toggle cursor visibility : %s\n", strerror(errno));