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- blit functions

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gbeauche 2000-09-22 17:15:27 +00:00
parent e8d4a865e2
commit 13bd5c97b9
1 changed files with 100 additions and 0 deletions
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BasiliskII/src/Unix/video_blit.h Normal file
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/*
* video_blit.h - Video/graphics emulation, blitters
*
* Basilisk II (C) 1997-2000 Christian Bauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef FB_BLIT_1
# error "Undefined 16-bit word blit function"
#endif
#ifndef FB_BLIT_2
# error "Undefined 32-bit word blit function"
#endif
#ifndef FB_DEPTH
# error "Undefined screen depth"
#endif
static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
{
#if FB_DEPTH <= 8
// Align source and dest to 16-bit word boundaries
if (FB_DEPTH <= 8 && ((unsigned long) source) & 1) {
*dest++ = *source++;
length -= 1;
}
#endif
// source and dest are mutually aligned
uint16 * swp = ((uint16 *)source);
uint16 * dwp = ((uint16 *) dest );
#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);
length -= 2;
}
#endif
// Blit 4-byte words
if (length >= 4) {
const int remainder = (length / 4) % 8;
uint32 * slp = (uint32 *)swp + remainder;
uint32 * dlp = (uint32 *)dwp + 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]);
} while (--n > 0);
}
}
#if FB_DEPTH <= 16
// There might remain 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);
}
#endif
}
#undef FB_FUNC_NAME
#ifdef FB_BLIT_1
#undef FB_BLIT_1
#endif
#ifdef FB_BLIT_2
#undef FB_BLIT_2
#endif
#ifdef FB_DEPTH
#undef FB_DEPTH
#endif