In some system (e.g. my "strange" device), line_length is not equal xres * bytes_per_pixel, so we need to use line_length in scr_fix to mmap and draw rectangle etc.
My "strange" device output this: bytes_per_pixel: 4 xres: 600, yres: 1024 yoffset: 0, xoffset: 0, line_length: 2432 G.addr: b74da000 Signed-off-by: Yin Kangkai <[email protected]> --- miscutils/fbsplash.c | 16 ++++++++-------- 1 files changed, 8 insertions(+), 8 deletions(-) diff --git a/miscutils/fbsplash.c b/miscutils/fbsplash.c index 51ba472..78c9d52 100644 --- a/miscutils/fbsplash.c +++ b/miscutils/fbsplash.c @@ -93,7 +93,7 @@ static void fb_open(const char *strfb_device) // map the device in memory G.addr = mmap(NULL, - G.scr_var.xres * G.scr_var.yres * G.bytes_per_pixel, + G.scr_var.yres * G.scr_fix.line_length, PROT_WRITE, MAP_SHARED, fbfd, 0); if (G.addr == MAP_FAILED) bb_perror_msg_and_die("mmap"); @@ -154,8 +154,8 @@ static void fb_drawrectangle(void) thispix = fb_pixel_value(nred, ngreen, nblue); // horizontal lines - ptr1 = G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * G.bytes_per_pixel; - ptr2 = G.addr + ((G.nbar_posy + G.nbar_height - 1) * G.scr_var.xres + G.nbar_posx) * G.bytes_per_pixel; + ptr1 = G.addr + G.nbar_posy * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel; + ptr2 = G.addr + (G.nbar_posy + G.nbar_height - 1) * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel; cnt = G.nbar_width - 1; do { fb_write_pixel(ptr1, thispix); @@ -165,14 +165,14 @@ static void fb_drawrectangle(void) } while (--cnt >= 0); // vertical lines - ptr1 = G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * G.bytes_per_pixel; - ptr2 = G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx + G.nbar_width - 1) * G.bytes_per_pixel; + ptr1 = G.addr + G.nbar_posy * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel; + ptr2 = G.addr + G.nbar_posy * G.scr_fix.line_length + (G.nbar_posx + G.nbar_width - 1) * G.bytes_per_pixel; cnt = G.nbar_height - 1; do { fb_write_pixel(ptr1, thispix); fb_write_pixel(ptr2, thispix); - ptr1 += G.scr_var.xres * G.bytes_per_pixel; - ptr2 += G.scr_var.xres * G.bytes_per_pixel; + ptr1 += G.scr_fix.line_length; + ptr2 += G.scr_fix.line_length; } while (--cnt >= 0); } @@ -195,7 +195,7 @@ static void fb_drawfullrectangle(int nx1pos, int ny1pos, int nx2pos, int ny2pos, cnt1 = ny2pos - ny1pos; nypos = ny1pos; do { - ptr = G.addr + (nypos * G.scr_var.xres + nx1pos) * G.bytes_per_pixel; + ptr = G.addr + nypos * G.scr_fix.line_length + nx1pos * G.bytes_per_pixel; cnt2 = nx2pos - nx1pos; do { fb_write_pixel(ptr, thispix); -- 1.7.3.4 _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
