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sm501: Implement negated destination raster operation mode

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Add support for the negated destination operation mode. This is used e.g.
by AmigaOS for the INVERSEVID drawing mode. With this change, the cursor
in the shell and non-immediate window adjustment are working now.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Sebastian Bauer 2018-07-04 11:40:58 +02:00 committed by David Gibson
parent 54b2a4339c
commit debc7e7dad
1 changed files with 11 additions and 1 deletions
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12
hw/display/sm501.c
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@ -705,6 +705,8 @@ static void sm501_2d_operation(SM501State *s)
uint32_t color = s->twoD_foreground;
int format_flags = (s->twoD_stretch >> 20) & 0x3;
int addressing = (s->twoD_stretch >> 16) & 0xF;
int rop_mode = (s->twoD_control >> 15) & 0x1; /* 1 for rop2, else rop3 */
int rop = s->twoD_control & 0xFF;
/* get frame buffer info */
uint8_t *src = s->local_mem + (s->twoD_source_base & 0x03FFFFFF);
@ -729,6 +731,8 @@ static void sm501_2d_operation(SM501State *s)
int y, x, index_d, index_s; \
for (y = 0; y < operation_height; y++) { \
for (x = 0; x < operation_width; x++) { \
_pixel_type val; \
\
if (rtl) { \
index_s = ((src_y - y) * src_width + src_x - x) * _bpp; \
index_d = ((dst_y - y) * dst_width + dst_x - x) * _bpp; \
@ -736,7 +740,13 @@ static void sm501_2d_operation(SM501State *s)
index_s = ((src_y + y) * src_width + src_x + x) * _bpp; \
index_d = ((dst_y + y) * dst_width + dst_x + x) * _bpp; \
} \
*(_pixel_type *)&dst[index_d] = *(_pixel_type *)&src[index_s];\
if (rop_mode == 1 && rop == 5) { \
/* Invert dest */ \
val = ~*(_pixel_type *)&dst[index_d]; \
} else { \
val = *(_pixel_type *)&src[index_s]; \
} \
*(_pixel_type *)&dst[index_d] = val; \
} \
} \
}