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)
105 unsigned char *fb = framebuffer + (drect.x + screen_rect.width * drect.y) * 4;
106 for(int i=0; i<drect.height; i++) {
107 for(int j=0; j<drect.width; j++) {
112 fb += screen_rect.width * 4;
116 void set_cursor_visibility(bool visible)
119 curs.enable = visible ? 1 : 0;
121 if(ioctl(dev_fd, FBIO_CURSOR, &curs) == -1) {
122 fprintf(stderr, "Cannot toggle cursor visibility : %s\n", strerror(errno));
126 void blit(unsigned char *src_img, const Rect &src_rect, unsigned char* dest_img,
127 const Rect &dest_rect, int dest_x, int dest_y)
129 int width = src_rect.width;
130 int height = src_rect.height;
132 int xoffs = dest_x - dest_rect.x;
134 dest_x = dest_rect.x;
138 int yoffs = dest_y - dest_rect.y;
140 dest_y = dest_rect.y;
144 int xend = dest_x + width;
145 if(xend >= dest_rect.width) {
146 width -= xend - dest_rect.width;
149 int yend = dest_y + height;
150 if(yend >= dest_rect.height) {
151 height -= yend - dest_rect.height;
154 if(width <= 0 || height <= 0) {
158 unsigned char *sptr = src_img + (src_rect.y * src_rect.width + src_rect.x) * 4;
159 unsigned char *dptr = dest_img + (dest_y * dest_rect.width + dest_x) * 4;
161 for(int i=0; i<height; i++) {
162 memcpy(dptr, sptr, width * 4);
163 sptr += src_rect.width * 4;
164 dptr += dest_rect.width * 4;
168 void blit_key(unsigned char *src_img, const Rect &src_rect, unsigned char* dest_img,
169 const Rect &dest_rect, int dest_x, int dest_y, int key_r, int key_g, int key_b)
171 int width = src_rect.width;
172 int height = src_rect.height;
174 int xoffs = dest_x - dest_rect.x;
176 dest_x = dest_rect.x;
180 int yoffs = dest_y - dest_rect.y;
182 dest_y = dest_rect.y;
186 int xend = dest_x + width;
187 if(xend >= dest_rect.width) {
188 width -= xend - dest_rect.width;
191 int yend = dest_y + height;
192 if(yend >= dest_rect.height) {
193 height -= yend - dest_rect.height;
196 if(width <= 0 || height <= 0) {
200 unsigned char *sptr = src_img + (src_rect.y * src_rect.width + src_rect.x) * 4;
201 unsigned char *dptr = dest_img + (dest_y * dest_rect.width + dest_x) * 4;
203 for(int i=0; i<height; i++) {
204 for(int j=0; j<width; j++) {
206 int g = sptr[j * 4 + 1];
207 int b = sptr[j * 4 + 2];
209 if(r != key_r || g != key_g || b != key_b) {
216 sptr += src_rect.width * 4;
217 dptr += dest_rect.width * 4;