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Initial reimport of double buffering

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-11-14 17:00:39 +01:00
parent df48e9e18d
commit 1f56d83788
10 changed files with 318 additions and 23 deletions
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52
video/fb/video_fb.c
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@ -66,6 +66,8 @@ grub_video_fb_init (void)
grub_err_t
grub_video_fb_fini (void)
{
/* TODO: destroy render targets. */
grub_free (palette);
render_target = 0;
palette = 0;
@ -1182,3 +1184,53 @@ grub_video_fb_get_active_render_target (struct grub_video_fbrender_target **targ
return GRUB_ERR_NONE;
}
static grub_err_t
doublebuf_blit_update_screen (struct grub_video_fbrender_target *front,
struct grub_video_fbrender_target *back)
{
grub_memcpy (front->data, back->data,
front->mode_info.pitch * front->mode_info.height);
return GRUB_ERR_NONE;
}
grub_err_t
grub_video_fb_doublebuf_blit_init (struct grub_video_fbrender_target **front,
struct grub_video_fbrender_target **back,
grub_video_fb_doublebuf_update_screen_t *update_screen,
struct grub_video_mode_info mode_info,
void *framebuf)
{
grub_err_t err;
int page_size = mode_info.pitch * mode_info.height;
void *offscreen_buffer;
err = grub_video_fb_create_render_target_from_pointer (front, &mode_info,
framebuf);
if (err)
return err;
offscreen_buffer = grub_malloc (page_size);
if (! offscreen_buffer)
{
grub_video_fb_delete_render_target (*front);
*front = 0;
return grub_errno;
}
err = grub_video_fb_create_render_target_from_pointer (back, &mode_info,
offscreen_buffer);
if (err)
{
grub_video_fb_delete_render_target (*front);
grub_free (offscreen_buffer);
*front = 0;
return grub_errno;
}
(*back)->is_allocated = 1;
*update_screen = doublebuf_blit_update_screen;
return GRUB_ERR_NONE;
}