+int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h,
+ int left_border, int right_border, int top_border, int bottom_border, int no_dblbuf)
+{
+ int w_total = left_border + w + right_border;
+ int h_total = top_border + h + bottom_border;
+ size_t mem_size;
+ int ret;
+
+ // unblank to be sure the mode is really accepted
+ ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
+
+ if (fbdev->fbvar_new.bits_per_pixel != 16 ||
+ w != fbdev->fbvar_new.xres ||
+ h != fbdev->fbvar_new.yres ||
+ w_total != fbdev->fbvar_new.xres_virtual ||
+ h_total > fbdev->fbvar_new.yres_virtual ||
+ left_border != fbdev->fbvar_new.xoffset) {
+ fbdev->fbvar_new.xres = w;
+ fbdev->fbvar_new.yres = h;
+ fbdev->fbvar_new.xres_virtual = w_total;
+ fbdev->fbvar_new.yres_virtual = h_total;
+ fbdev->fbvar_new.xoffset = left_border;
+ fbdev->fbvar_new.bits_per_pixel = 16;
+ printf(" switching to %dx%d@16\n", w, h);
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ perror("FBIOPUT_VSCREENINFO ioctl");
+ return -1;
+ }
+ }
+
+ fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
+ if (no_dblbuf)
+ fbdev->buffer_count = 1;
+
+ if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
+ fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ fbdev->buffer_count = 1;
+ fprintf(stderr, "Warning: failed to increase virtual resolution, "
+ "doublebuffering disabled\n");
+ }
+ }
+
+ fbdev->fb_size = w_total * h_total * 2;
+ fbdev->top_border = top_border;
+ fbdev->bottom_border = bottom_border;
+
+ mem_size = fbdev->fb_size * fbdev->buffer_count;
+ if (fbdev->mem_size >= mem_size)
+ return 0;
+
+ if (fbdev->mem != NULL)
+ munmap(fbdev->mem, fbdev->mem_size);
+
+ fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+ if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
+ fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
+ fbdev->buffer_count = 1;
+ mem_size = fbdev->fb_size;
+ fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+ }
+ if (fbdev->mem == MAP_FAILED) {
+ fbdev->mem = NULL;
+ fbdev->mem_size = 0;
+ perror("mmap framebuffer");
+ return -1;
+ }
+
+ fbdev->mem_size = mem_size;
+ return 0;
+}
+