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vga: do not treat horiz pel panning value of 8 as "enabled"

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Horizontal pel panning bit 3 is only used in text mode.  In graphics
mode, it can be treated as if it was zero, thus not extending the
dirty memory region.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-04-02 12:26:36 +02:00
parent 3b6d2b1962
commit 1d1ee7e0a1
1 changed files with 3 additions and 1 deletions
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4
hw/display/vga.c
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@ -1571,7 +1571,9 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
break;
}
}
hpel = bits <= 8 ? s->params.hpel : 0;
/* Horizontal pel panning bit 3 is only used in text mode. */
hpel = bits <= 8 ? s->params.hpel & 7 : 0;
region_start = (s->params.start_addr * 4);
region_end = region_start + (ram_addr_t)s->params.line_offset * height;