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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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#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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*dest++ = *source++; |
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length -= 1; |
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} |
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#endif |
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// source and dest are mutually aligned |
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uint16 * swp = ((uint16 *)source); |
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uint16 * dwp = ((uint16 *) dest ); |
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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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const uint16 val = *swp++; |
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FB_BLIT_1(*dwp++, val); |
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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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uint32 * slp = (uint32 *)swp + remainder; |
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uint32 * dlp = (uint32 *)dwp + remainder; |
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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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slp += 8; dlp += 8; |
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FB_BLIT_2(dlp[-8], slp[-8]); |
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case 7: FB_BLIT_2(dlp[-7], slp[-7]); |
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case 6: FB_BLIT_2(dlp[-6], slp[-6]); |
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case 5: FB_BLIT_2(dlp[-5], slp[-5]); |
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case 4: FB_BLIT_2(dlp[-4], slp[-4]); |
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case 3: FB_BLIT_2(dlp[-3], slp[-3]); |
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case 2: FB_BLIT_2(dlp[-2], slp[-2]); |
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case 1: FB_BLIT_2(dlp[-1], slp[-1]); |
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} while (--n > 0); |
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} |
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} |
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#if FB_DEPTH <= 16 |
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// There might remain one word to blit |
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if (length & 2) { |
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uint16 * const s = (uint16 *)(((uint8 *)swp) + length - 2); |
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uint16 * const d = (uint16 *)(((uint8 *)dwp) + length - 2); |
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FB_BLIT_1(*d, *s); |
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} |
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#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 |
