From bf26ad72a60c0009a99179b449a43daa6bf4b4f6 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Tue, 8 May 2007 00:39:09 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/fb.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include') diff --git a/include/linux/fb.h b/include/linux/fb.h index 70d154a02c5..619ba1e40ab 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); -- cgit v1.2.3