Signed-off-by: Kevin O'Connor kevin@koconnor.net --- vgasrc/vgafb.c | 34 ++++++++++++++++++++++++++++++++-- 1 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/vgasrc/vgafb.c b/vgasrc/vgafb.c index 2104b44..85e4ab3 100644 --- a/vgasrc/vgafb.c +++ b/vgasrc/vgafb.c @@ -105,6 +105,35 @@ scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr }
static void +scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr + , struct cursorpos ul, struct cursorpos lr) +{ + int cheight = 8; + int cwidth = 8; + int stride = GET_BDA(video_cols) * cwidth; + void *src_far, *dest_far; + if (nblines >= 0) { + dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth); + src_far = dest_far + nblines * cheight * stride; + } else { + // Scroll down + nblines = -nblines; + dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth); + src_far = dest_far - nblines * cheight * stride; + stride = -stride; + } + int cols = lr.x - ul.x + 1; + int rows = lr.y - ul.y + 1; + if (nblines < rows) + dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth + , stride, (rows - nblines) * cheight); + if (attr < 0) + attr = 0; + memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth + , stride, nblines * cheight); +} + +static void scroll_text(struct vgamode_s *vmode_g, int nblines, int attr , struct cursorpos ul, struct cursorpos lr) { @@ -158,8 +187,9 @@ vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr) case CGA: scroll_cga(vmode_g, nblines, attr, ul, lr); break; - default: - dprintf(1, "Scroll in graphics mode\n"); + case LINEAR8: + scroll_lin(vmode_g, nblines, attr, ul, lr); + break; } }