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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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* 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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* 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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#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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#ifndef FB_BLIT_2 |
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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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#ifndef FB_DEPTH |
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# error "Undefined screen depth" |
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#if !defined(FB_BLIT_4) |
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# error "Undefined 64-bit word blit function" |
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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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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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#define DEREF_WORD_PTR(ptr, ofs) (((uint16 *)(ptr))[(ofs)]) |
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#define DEREF_LONG_PTR(ptr, ofs) (((uint32 *)(ptr))[(ofs)]) |
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#define DEREF_QUAD_PTR(ptr, ofs) (((uint64 *)(ptr))[(ofs)]) |
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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 (FB_DEPTH <= 8 && ((unsigned long) source) & 1) { |
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*d.bp++ = *s.bp++; |
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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 <= 8 |
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if (length >= 2) { |
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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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const uint16 val = *s.wp++; |
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FB_BLIT_1(*d.wp++, val); |
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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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// 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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s.lp += remainder; |
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d.lp += remainder; |
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// Blit 8-byte words |
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if (length >= 8) { |
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const int remainder = (length / 8) % 8; |
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source += remainder * 8; |
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dest += remainder * 8; |
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int n = ((length / 4) + 7) / 8; |
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int n = ((length / 8) + 7) / 8; |
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switch (remainder) { |
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case 0: do { |
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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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dest += 64; source += 64; |
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FB_BLIT_4(DEREF_QUAD_PTR(dest, -8), DEREF_QUAD_PTR(source, -8)); |
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case 7: FB_BLIT_4(DEREF_QUAD_PTR(dest, -7), DEREF_QUAD_PTR(source, -7)); |
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case 6: FB_BLIT_4(DEREF_QUAD_PTR(dest, -6), DEREF_QUAD_PTR(source, -6)); |
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case 5: FB_BLIT_4(DEREF_QUAD_PTR(dest, -5), DEREF_QUAD_PTR(source, -5)); |
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case 4: FB_BLIT_4(DEREF_QUAD_PTR(dest, -4), DEREF_QUAD_PTR(source, -4)); |
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case 3: FB_BLIT_4(DEREF_QUAD_PTR(dest, -3), DEREF_QUAD_PTR(source, -3)); |
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case 2: FB_BLIT_4(DEREF_QUAD_PTR(dest, -2), DEREF_QUAD_PTR(source, -2)); |
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case 1: FB_BLIT_4(DEREF_QUAD_PTR(dest, -1), DEREF_QUAD_PTR(source, -1)); |
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} while (--n > 0); |
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} |
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} |
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// There could be one long left to blit |
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if (length & 4) { |
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FB_BLIT_2(DEREF_LONG_PTR(dest, 0), DEREF_LONG_PTR(source, 0)); |
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#if FB_DEPTH <= 16 |
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dest += 4; |
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source += 4; |
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#endif |
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} |
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|
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#if FB_DEPTH <= 16 |
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// There might remain at least one word to blit |
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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(*d.wp, *s.wp); |
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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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d.wp++; |
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s.wp++; |
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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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#if FB_DEPTH <= 8 |
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} |
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// There might remain one byte to blit |
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// There could be one byte left to blit |
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if (length & 1) |
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*d.bp = *s.bp; |
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*dest = *source; |
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#endif |
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#undef DEREF_LONG_PTR |
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#undef DEREF_WORD_PTR |
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} |
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#undef FB_FUNC_NAME |
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#undef FB_BLIT_2 |
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#endif |
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#ifdef FB_BLIT_4 |
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#undef FB_BLIT_4 |
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#endif |
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#ifdef FB_DEPTH |
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#undef FB_DEPTH |
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#endif |
