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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) 1997-2001 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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|
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#ifndef FB_DEPTH |
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# error "Undefined screen depth" |
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#endif |
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|
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#if !defined(FB_BLIT_1) && (FB_DEPTH <= 16) |
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# error "Undefined 16-bit word blit function" |
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#endif |
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|
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#if !defined(FB_BLIT_2) |
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# error "Undefined 32-bit word blit function" |
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#endif |
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|
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static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length) |
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{ |
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#define DEREF_LONG_PTR(ptr, ofs) (((uint32 *)(ptr))[(ofs)]) |
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#define DEREF_WORD_PTR(ptr, ofs) (((uint16 *)(ptr))[(ofs)]) |
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|
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#ifndef UNALIGNED_PROFITABLE |
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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 (((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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|
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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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FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0)); |
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dest += 2; source += 2; |
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length -= 2; |
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} |
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#endif |
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#endif |
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|
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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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source += remainder * 4; |
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dest += remainder * 4; |
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|
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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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dest += 32; source += 32; |
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FB_BLIT_2(DEREF_LONG_PTR(dest, -8), DEREF_LONG_PTR(source, -8)); |
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case 7: FB_BLIT_2(DEREF_LONG_PTR(dest, -7), DEREF_LONG_PTR(source, -7)); |
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case 6: FB_BLIT_2(DEREF_LONG_PTR(dest, -6), DEREF_LONG_PTR(source, -6)); |
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case 5: FB_BLIT_2(DEREF_LONG_PTR(dest, -5), DEREF_LONG_PTR(source, -5)); |
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case 4: FB_BLIT_2(DEREF_LONG_PTR(dest, -4), DEREF_LONG_PTR(source, -4)); |
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case 3: FB_BLIT_2(DEREF_LONG_PTR(dest, -3), DEREF_LONG_PTR(source, -3)); |
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case 2: FB_BLIT_2(DEREF_LONG_PTR(dest, -2), DEREF_LONG_PTR(source, -2)); |
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case 1: FB_BLIT_2(DEREF_LONG_PTR(dest, -1), DEREF_LONG_PTR(source, -1)); |
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} while (--n > 0); |
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} |
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} |
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|
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#if FB_DEPTH <= 16 |
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// There could be one word left to blit |
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if (length & 2) { |
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FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0)); |
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#if FB_DEPTH <= 8 |
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dest += 2; |
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source += 2; |
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#endif |
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} |
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#endif |
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|
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#if FB_DEPTH <= 8 |
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// There could be one byte left to blit |
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if (length & 1) |
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*dest = *source; |
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#endif |
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|
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#undef DEREF_LONG_PTR |
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#undef DEREF_WORD_PTR |
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} |
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|
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#undef FB_FUNC_NAME |
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|
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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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|
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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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|
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#ifdef FB_DEPTH |
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#undef FB_DEPTH |
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#endif |
