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vga: merge conditionals on shift control register

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There are two sets of conditionals using the shift control bits: one to
verify the palette and adjust disp_width, one to compute the "v" and
"bits" variables.  Merge them into one, with the extra benefit that
we now have the "bits" value available early and can use it to
compute region_end.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2024-04-02 12:24:20 +02:00
parent 7fcf7575f3
commit 5c00acebb6
1 changed files with 42 additions and 47 deletions
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89
hw/display/vga.c
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@@ -1546,12 +1546,54 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
}
if (shift_control == 0) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
disp_width <<= 1;
v = VGA_DRAW_LINE4D2;
} else {
v = VGA_DRAW_LINE4;
}
bits = 4;
} else if (shift_control == 1) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
disp_width <<= 1;
v = VGA_DRAW_LINE2D2;
} else {
v = VGA_DRAW_LINE2;
}
bits = 4;
} else {
switch (depth) {
default:
case 0:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8D2;
bits = 4;
break;
case 8:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8;
bits = 8;
break;
case 15:
v = s->big_endian_fb ? VGA_DRAW_LINE15_BE : VGA_DRAW_LINE15_LE;
bits = 16;
break;
case 16:
v = s->big_endian_fb ? VGA_DRAW_LINE16_BE : VGA_DRAW_LINE16_LE;
bits = 16;
break;
case 24:
v = s->big_endian_fb ? VGA_DRAW_LINE24_BE : VGA_DRAW_LINE24_LE;
bits = 24;
break;
case 32:
v = s->big_endian_fb ? VGA_DRAW_LINE32_BE : VGA_DRAW_LINE32_LE;
bits = 32;
break;
}
}
@@ -1607,53 +1649,6 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
}
}
if (shift_control == 0) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
v = VGA_DRAW_LINE4D2;
} else {
v = VGA_DRAW_LINE4;
}
bits = 4;
} else if (shift_control == 1) {
full_update |= update_palette16(s);
if (sr(s, VGA_SEQ_CLOCK_MODE) & 8) {
v = VGA_DRAW_LINE2D2;
} else {
v = VGA_DRAW_LINE2;
}
bits = 4;
} else {
switch(s->get_bpp(s)) {
default:
case 0:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8D2;
bits = 4;
break;
case 8:
full_update |= update_palette256(s);
v = VGA_DRAW_LINE8;
bits = 8;
break;
case 15:
v = s->big_endian_fb ? VGA_DRAW_LINE15_BE : VGA_DRAW_LINE15_LE;
bits = 16;
break;
case 16:
v = s->big_endian_fb ? VGA_DRAW_LINE16_BE : VGA_DRAW_LINE16_LE;
bits = 16;
break;
case 24:
v = s->big_endian_fb ? VGA_DRAW_LINE24_BE : VGA_DRAW_LINE24_LE;
bits = 24;
break;
case 32:
v = s->big_endian_fb ? VGA_DRAW_LINE32_BE : VGA_DRAW_LINE32_LE;
bits = 32;
break;
}
}
vga_draw_line = vga_draw_line_table[v];
if (!is_buffer_shared(surface) && s->cursor_invalidate) {