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- cleaned up and fixed 8bpp copy

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This commit is contained in:
gbeauche 2000-09-23 08:39:55 +00:00
parent b251b89073
commit ca11a645d2
1 changed files with 33 additions and 22 deletions
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55
BasiliskII/src/Unix/video_blit.h
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@ -32,18 +32,23 @@
static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
{
union {
uint8 * bp;
uint16 * wp;
uint32 * lp;
} s, d;
s.bp = (uint8 *)source;
d.bp = dest;
#if FB_DEPTH <= 8
// Align source and dest to 16-bit word boundaries
if (FB_DEPTH <= 8 && ((unsigned long) source) & 1) {
*dest++ = *source++;
*d.bp++ = *s.bp++;
length -= 1;
}
#endif
// source and dest are mutually aligned
uint16 * swp = ((uint16 *)source);
uint16 * dwp = ((uint16 *) dest );
#if FB_DEPTH <= 8
if (length >= 2) {
#endif
@ -51,8 +56,8 @@ static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
#if FB_DEPTH <= 16
// Align source and dest to 32-bit word boundaries
if (((unsigned long) source) & 2) {
const uint16 val = *swp++;
FB_BLIT_1(*dwp++, val);
const uint16 val = *s.wp++;
FB_BLIT_1(*d.wp++, val);
length -= 2;
}
#endif
@ -60,36 +65,42 @@ static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
// Blit 4-byte words
if (length >= 4) {
const int remainder = (length / 4) % 8;
uint32 * slp = (uint32 *)swp + remainder;
uint32 * dlp = (uint32 *)dwp + remainder;
s.lp += remainder;
d.lp += remainder;
int n = ((length / 4) + 7) / 8;
switch (remainder) {
case 0: do {
slp += 8; dlp += 8;
FB_BLIT_2(dlp[-8], slp[-8]);
case 7: FB_BLIT_2(dlp[-7], slp[-7]);
case 6: FB_BLIT_2(dlp[-6], slp[-6]);
case 5: FB_BLIT_2(dlp[-5], slp[-5]);
case 4: FB_BLIT_2(dlp[-4], slp[-4]);
case 3: FB_BLIT_2(dlp[-3], slp[-3]);
case 2: FB_BLIT_2(dlp[-2], slp[-2]);
case 1: FB_BLIT_2(dlp[-1], slp[-1]);
s.lp += 8; d.lp += 8;
FB_BLIT_2(d.lp[-8], s.lp[-8]);
case 7: FB_BLIT_2(d.lp[-7], s.lp[-7]);
case 6: FB_BLIT_2(d.lp[-6], s.lp[-6]);
case 5: FB_BLIT_2(d.lp[-5], s.lp[-5]);
case 4: FB_BLIT_2(d.lp[-4], s.lp[-4]);
case 3: FB_BLIT_2(d.lp[-3], s.lp[-3]);
case 2: FB_BLIT_2(d.lp[-2], s.lp[-2]);
case 1: FB_BLIT_2(d.lp[-1], s.lp[-1]);
} while (--n > 0);
}
}
#if FB_DEPTH <= 16
// There might remain one word to blit
// There might remain at least one word to blit
if (length & 2) {
uint16 * const s = (uint16 *)(((uint8 *)swp) + length - 2);
uint16 * const d = (uint16 *)(((uint8 *)dwp) + length - 2);
FB_BLIT_1(*d, *s);
FB_BLIT_1(*d.wp, *s.wp);
#if FB_DEPTH <= 8
d.wp++;
s.wp++;
#endif
}
#endif
#if FB_DEPTH <= 8
}
// There might remain one byte to blit
if (length & 1)
*d.bp = *s.bp;
#endif
}