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86F: Preserve weak bits.

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OBattler
2024-12-08 02:58:57 +01:00
parent 11282b1202
commit 20feee1e00
1 changed files with 8 additions and 6 deletions
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14
src/floppy/fdd_86f.c
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@@ -2911,6 +2911,7 @@ d86f_decompose_encoded_buffer(int drive, int side)
uint16_t temp2;
uint32_t len;
const uint16_t *dst = dev->track_encoded_data[side];
const uint16_t *dst_s = dev->track_surface_data[side];
uint16_t *src1 = dev->thin_track_encoded_data[0][side];
uint16_t *src1_s = dev->thin_track_surface_data[0][side];
uint16_t *src2 = dev->thin_track_encoded_data[1][side];
@@ -2922,12 +2923,13 @@ d86f_decompose_encoded_buffer(int drive, int side)
if (d86f_has_surface_desc(drive)) {
/* Source image has surface description data, so we have some more handling to do.
We need hole masks for both buffers. Holes have data bit clear and surface bit set. */
temp = ~src1[i] & src1_s[i];
temp2 = ~src2[i] & src2_s[i];
src1[i] = dst[i] & ~temp;
src1_s[i] = temp;
src2[i] = dst[i] & ~temp2;
src2_s[i] = temp2;
src1_s[i] = src2_s[i] = dst_s[i]; /* Write the new holes and weak bits. */
temp = ~src1[i] & src1_s[i]; /* Bits that are clear in data and set in surface are holes. */
temp2 = ~src2[i] & src2_s[i]; /* Bits that are clear in data and set in surface are holes. */
src1[i] = dst[i] & ~temp; /* Make sure the holes' bits are cleared in the decomposed buffer. */
src1_s[i] |= temp; /* Make sure the holes' bits are set in the decomposed surface. */
src2[i] = dst[i] & ~temp2; /* Make sure the holes' bits are cleared in the decomposed buffer. */
src2_s[i] |= temp2; /* Make sure the holes' bits are set in the decomposed surface. */
} else
src1[i] = src2[i] = dst[i];
}