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| author | Antonino A. Daplas <adaplas@gmail.com> | 2007-05-08 00:39:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:30 -0700 |
| commit | bf26ad72a60c0009a99179b449a43daa6bf4b4f6 (patch) | |
| tree | 55ba5c443aa0e0aa97e692f4be29c582356fd056 | |
| parent | dc0e6e0544f1cb2af44e5d7a7e68acda05dec6fa (diff) | |
| download | linux-bf26ad72a60c0009a99179b449a43daa6bf4b4f6.tar.gz linux-bf26ad72a60c0009a99179b449a43daa6bf4b4f6.tar.bz2 linux-bf26ad72a60c0009a99179b449a43daa6bf4b4f6.zip | |
fbdev: advertise limitation of drawing engine
A few drivers are not capable of blitting rectangles of any dimension.
vga16fb can only blit 8-pixel wide rectangles, while s3fb (in tileblitting
mode) can only blit 8x16 rectangles. For example, loading a 12x22 font in
vga16fb will result in a corrupt display.
Advertise this limitation/capability in info->pixmap.blit_x and blit_y. These
fields are 32-bit arrays (font max is 32x32 only), ie, if bit 7 is set, then
width/height of 7+1 is supported.
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/video/fbmem.c | 6 | ||||
| -rw-r--r-- | include/linux/fb.h | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 7b72841222df..c4ce3e44327e 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -1321,6 +1321,12 @@ register_framebuffer(struct fb_info *fb_info) } fb_info->pixmap.offset = 0; + if (!fb_info->pixmap.blit_x) + fb_info->pixmap.blit_x = ~(u32)0; + + if (!fb_info->pixmap.blit_y) + fb_info->pixmap.blit_y = ~(u32)0; + if (!fb_info->modelist.prev || !fb_info->modelist.next) INIT_LIST_HEAD(&fb_info->modelist); diff --git a/include/linux/fb.h b/include/linux/fb.h index 70d154a02c5c..619ba1e40ab9 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -558,6 +558,10 @@ struct fb_pixmap { u32 scan_align; /* alignment per scanline */ u32 access_align; /* alignment per read/write (bits) */ u32 flags; /* see FB_PIXMAP_* */ + u32 blit_x; /* supported bit block dimensions (1-32)*/ + u32 blit_y; /* Format: blit_x = 1 << (width - 1) */ + /* blit_y = 1 << (height - 1) */ + /* if 0, will be set to 0xffffffff (all)*/ /* access methods */ void (*writeio)(struct fb_info *info, void __iomem *dst, void *src, unsigned int size); void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size); |