+/* it is recommended to call vout_fbdev_clear() before this */
+void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
+ int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
+{
+ 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 != bpp ||
+ 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->buffer_count != buffer_cnt)
+ {
+ if (fbdev->fbvar_new.bits_per_pixel != bpp ||
+ w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
+ printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
+
+ fbdev->fbvar_new.xres = w;
+ fbdev->fbvar_new.yres = h;
+ fbdev->fbvar_new.xres_virtual = w_total;
+ fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
+ fbdev->fbvar_new.xoffset = left_border;
+ fbdev->fbvar_new.yoffset = top_border;
+ fbdev->fbvar_new.bits_per_pixel = bpp;
+ fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
+ fbdev->buffer_count = buffer_cnt;
+ fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
+
+ // seems to help a bit to avoid glitches
+ vout_fbdev_wait_vsync(fbdev);
+
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ // retry with no multibuffering
+ fbdev->fbvar_new.yres_virtual = h_total;
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ perror(PFX "FBIOPUT_VSCREENINFO ioctl");
+ return NULL;
+ }
+ fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
+ fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
+ "multibuffering disabled\n");
+ }
+
+ }
+
+ fbdev->fb_size = w_total * h_total * bpp / 8;
+ fbdev->top_border = top_border;
+ fbdev->bottom_border = bottom_border;
+
+ mem_size = fbdev->fb_size * fbdev->buffer_count;
+ if (fbdev->mem_size >= mem_size)
+ goto out;
+
+ 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, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
+ fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
+ 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(PFX "mmap framebuffer");
+ return NULL;
+ }
+
+ fbdev->mem_size = mem_size;
+
+out:
+ return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
+}
+