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gbeauche |
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/* |
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* video_blit.h - Video/graphics emulation, blitters |
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* |
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* Basilisk II (C) 1997-2000 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#ifndef FB_BLIT_1 |
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# error "Undefined 16-bit word blit function" |
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#endif |
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#ifndef FB_BLIT_2 |
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# error "Undefined 32-bit word blit function" |
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#endif |
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#ifndef FB_DEPTH |
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# error "Undefined screen depth" |
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#endif |
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static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length) |
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{ |
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gbeauche |
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union { |
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uint8 * bp; |
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uint16 * wp; |
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uint32 * lp; |
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} s, d; |
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s.bp = (uint8 *)source; |
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d.bp = dest; |
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gbeauche |
1.1 |
#if FB_DEPTH <= 8 |
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// Align source and dest to 16-bit word boundaries |
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if (FB_DEPTH <= 8 && ((unsigned long) source) & 1) { |
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gbeauche |
1.3 |
*d.bp++ = *s.bp++; |
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gbeauche |
1.1 |
length -= 1; |
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} |
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#endif |
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gbeauche |
1.2 |
#if FB_DEPTH <= 8 |
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if (length >= 2) { |
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#endif |
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gbeauche |
1.1 |
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#if FB_DEPTH <= 16 |
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// Align source and dest to 32-bit word boundaries |
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if (((unsigned long) source) & 2) { |
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gbeauche |
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const uint16 val = *s.wp++; |
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FB_BLIT_1(*d.wp++, val); |
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gbeauche |
1.1 |
length -= 2; |
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} |
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#endif |
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// Blit 4-byte words |
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if (length >= 4) { |
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const int remainder = (length / 4) % 8; |
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gbeauche |
1.3 |
s.lp += remainder; |
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d.lp += remainder; |
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gbeauche |
1.1 |
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int n = ((length / 4) + 7) / 8; |
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switch (remainder) { |
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case 0: do { |
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gbeauche |
1.3 |
s.lp += 8; d.lp += 8; |
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FB_BLIT_2(d.lp[-8], s.lp[-8]); |
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case 7: FB_BLIT_2(d.lp[-7], s.lp[-7]); |
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case 6: FB_BLIT_2(d.lp[-6], s.lp[-6]); |
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case 5: FB_BLIT_2(d.lp[-5], s.lp[-5]); |
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case 4: FB_BLIT_2(d.lp[-4], s.lp[-4]); |
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case 3: FB_BLIT_2(d.lp[-3], s.lp[-3]); |
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case 2: FB_BLIT_2(d.lp[-2], s.lp[-2]); |
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case 1: FB_BLIT_2(d.lp[-1], s.lp[-1]); |
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gbeauche |
1.1 |
} while (--n > 0); |
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} |
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} |
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#if FB_DEPTH <= 16 |
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gbeauche |
1.3 |
// There might remain at least one word to blit |
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gbeauche |
1.1 |
if (length & 2) { |
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gbeauche |
1.3 |
FB_BLIT_1(*d.wp, *s.wp); |
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#if FB_DEPTH <= 8 |
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d.wp++; |
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s.wp++; |
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#endif |
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gbeauche |
1.2 |
} |
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#endif |
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#if FB_DEPTH <= 8 |
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gbeauche |
1.1 |
} |
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gbeauche |
1.3 |
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// There might remain one byte to blit |
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if (length & 1) |
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*d.bp = *s.bp; |
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gbeauche |
1.1 |
#endif |
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} |
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#undef FB_FUNC_NAME |
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#ifdef FB_BLIT_1 |
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#undef FB_BLIT_1 |
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#endif |
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#ifdef FB_BLIT_2 |
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#undef FB_BLIT_2 |
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#endif |
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#ifdef FB_DEPTH |
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#undef FB_DEPTH |
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#endif |
