src/Unix/video_blit.h

/*
 *  video_blit.h - Video/graphics emulation, blitters
 *
 *  Basilisk II (C) 1997-2002 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_DEPTH
# error "Undefined screen depth"
#endif

#if !defined(FB_BLIT_1) && (FB_DEPTH <= 16)
# error "Undefined 16-bit word blit function"
#endif

#if !defined(FB_BLIT_2)
# error "Undefined 32-bit word blit function"
#endif

#if !defined(FB_BLIT_4)
# error "Undefined 64-bit word blit function"
#endif

static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
{
#define DEREF_WORD_PTR(ptr, ofs) (((uint16 *)(ptr))[(ofs)])
#define DEREF_LONG_PTR(ptr, ofs) (((uint32 *)(ptr))[(ofs)])
#define DEREF_QUAD_PTR(ptr, ofs) (((uint64 *)(ptr))[(ofs)])
        
#ifndef UNALIGNED_PROFITABLE
#if FB_DEPTH <= 8
        // Align source and dest to 16-bit word boundaries
        if (((unsigned long) source) & 1) {
                *dest++ = *source++;
                length -= 1;
        }
#endif
        
#if FB_DEPTH <= 16
        // Align source and dest to 32-bit word boundaries
        if (((unsigned long) source) & 2) {
                FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0));
                dest += 2; source += 2;
                length -= 2;
        }
#endif
#endif
        
        // Blit 8-byte words
        if (length >= 8) {
                const int remainder = (length / 8) % 8;
                source += remainder * 8;
                dest += remainder * 8;
                
                int n = ((length / 8) + 7) / 8;
                switch (remainder) {
                case 0: do {
                                dest += 64; source += 64;
                                FB_BLIT_4(DEREF_QUAD_PTR(dest, -8), DEREF_QUAD_PTR(source, -8));
                case 7: FB_BLIT_4(DEREF_QUAD_PTR(dest, -7), DEREF_QUAD_PTR(source, -7));
                case 6: FB_BLIT_4(DEREF_QUAD_PTR(dest, -6), DEREF_QUAD_PTR(source, -6));
                case 5: FB_BLIT_4(DEREF_QUAD_PTR(dest, -5), DEREF_QUAD_PTR(source, -5));
                case 4: FB_BLIT_4(DEREF_QUAD_PTR(dest, -4), DEREF_QUAD_PTR(source, -4));
                case 3: FB_BLIT_4(DEREF_QUAD_PTR(dest, -3), DEREF_QUAD_PTR(source, -3));
                case 2: FB_BLIT_4(DEREF_QUAD_PTR(dest, -2), DEREF_QUAD_PTR(source, -2));
                case 1: FB_BLIT_4(DEREF_QUAD_PTR(dest, -1), DEREF_QUAD_PTR(source, -1));
                                } while (--n > 0);
                }
        }
        
        // There could be one long left to blit
        if (length & 4) {
                FB_BLIT_2(DEREF_LONG_PTR(dest, 0), DEREF_LONG_PTR(source, 0));
#if FB_DEPTH <= 16
                dest += 4;
                source += 4;
#endif
        }
        
#if FB_DEPTH <= 16
        // There could be one word left to blit
        if (length & 2) {
                FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0));
#if FB_DEPTH <= 8
                dest += 2;
                source += 2;
#endif
        }
#endif
        
#if FB_DEPTH <= 8
        // There could be one byte left to blit
        if (length & 1)
                *dest = *source;
#endif
        
#undef DEREF_LONG_PTR
#undef DEREF_WORD_PTR
}

#undef FB_FUNC_NAME

#ifdef FB_BLIT_1
#undef FB_BLIT_1
#endif

#ifdef FB_BLIT_2
#undef FB_BLIT_2
#endif

#ifdef FB_BLIT_4
#undef FB_BLIT_4
#endif

#ifdef FB_DEPTH
#undef FB_DEPTH
#endif
Revision:	1.6
Committed:	2002-01-15T14:58:37Z (22 years, 10 months ago) by cebix
Content type:	text/plain
Branch:	MAIN
CVS Tags:	nigel-build-12, nigel-build-13, snapshot-15012002
Changes since 1.5:	+1 -1 lines
Log Message:	- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* video_blit.h - Video/graphics emulation, blitters
3			*
4	cebix	1.6	* Basilisk II (C) 1997-2002 Christian Bauer
5	gbeauche	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21	gbeauche	1.4	#ifndef FB_DEPTH
22			# error "Undefined screen depth"
23			#endif
24
25			#if !defined(FB_BLIT_1) && (FB_DEPTH <= 16)
26	gbeauche	1.1	# error "Undefined 16-bit word blit function"
27			#endif
28
29	gbeauche	1.4	#if !defined(FB_BLIT_2)
30	gbeauche	1.1	# error "Undefined 32-bit word blit function"
31			#endif
32
33	gbeauche	1.5	#if !defined(FB_BLIT_4)
34			# error "Undefined 64-bit word blit function"
35			#endif
36
37	gbeauche	1.1	static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
38			{
39	gbeauche	1.5	#define DEREF_WORD_PTR(ptr, ofs) (((uint16 *)(ptr))[(ofs)])
40	gbeauche	1.4	#define DEREF_LONG_PTR(ptr, ofs) (((uint32 *)(ptr))[(ofs)])
41	gbeauche	1.5	#define DEREF_QUAD_PTR(ptr, ofs) (((uint64 *)(ptr))[(ofs)])
42	gbeauche	1.3
43	gbeauche	1.4	#ifndef UNALIGNED_PROFITABLE
44	gbeauche	1.1	#if FB_DEPTH <= 8
45			// Align source and dest to 16-bit word boundaries
46	gbeauche	1.4	if (((unsigned long) source) & 1) {
47			dest++ = source++;
48	gbeauche	1.1	length -= 1;
49			}
50			#endif
51
52			#if FB_DEPTH <= 16
53			// Align source and dest to 32-bit word boundaries
54			if (((unsigned long) source) & 2) {
55	gbeauche	1.4	FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0));
56			dest += 2; source += 2;
57	gbeauche	1.1	length -= 2;
58			}
59			#endif
60	gbeauche	1.4	#endif
61	gbeauche	1.1
62	gbeauche	1.5	// Blit 8-byte words
63			if (length >= 8) {
64			const int remainder = (length / 8) % 8;
65			source += remainder * 8;
66			dest += remainder * 8;
67	gbeauche	1.1
68	gbeauche	1.5	int n = ((length / 8) + 7) / 8;
69	gbeauche	1.1	switch (remainder) {
70			case 0: do {
71	gbeauche	1.5	dest += 64; source += 64;
72			FB_BLIT_4(DEREF_QUAD_PTR(dest, -8), DEREF_QUAD_PTR(source, -8));
73			case 7: FB_BLIT_4(DEREF_QUAD_PTR(dest, -7), DEREF_QUAD_PTR(source, -7));
74			case 6: FB_BLIT_4(DEREF_QUAD_PTR(dest, -6), DEREF_QUAD_PTR(source, -6));
75			case 5: FB_BLIT_4(DEREF_QUAD_PTR(dest, -5), DEREF_QUAD_PTR(source, -5));
76			case 4: FB_BLIT_4(DEREF_QUAD_PTR(dest, -4), DEREF_QUAD_PTR(source, -4));
77			case 3: FB_BLIT_4(DEREF_QUAD_PTR(dest, -3), DEREF_QUAD_PTR(source, -3));
78			case 2: FB_BLIT_4(DEREF_QUAD_PTR(dest, -2), DEREF_QUAD_PTR(source, -2));
79			case 1: FB_BLIT_4(DEREF_QUAD_PTR(dest, -1), DEREF_QUAD_PTR(source, -1));
80	gbeauche	1.1	} while (--n > 0);
81			}
82			}
83
84	gbeauche	1.5	// There could be one long left to blit
85			if (length & 4) {
86			FB_BLIT_2(DEREF_LONG_PTR(dest, 0), DEREF_LONG_PTR(source, 0));
87			#if FB_DEPTH <= 16
88			dest += 4;
89			source += 4;
90			#endif
91			}
92
93	gbeauche	1.1	#if FB_DEPTH <= 16
94	gbeauche	1.4	// There could be one word left to blit
95	gbeauche	1.1	if (length & 2) {
96	gbeauche	1.4	FB_BLIT_1(DEREF_WORD_PTR(dest, 0), DEREF_WORD_PTR(source, 0));
97	gbeauche	1.3	#if FB_DEPTH <= 8
98	gbeauche	1.4	dest += 2;
99			source += 2;
100	gbeauche	1.3	#endif
101	gbeauche	1.2	}
102			#endif
103
104			#if FB_DEPTH <= 8
105	gbeauche	1.4	// There could be one byte left to blit
106	gbeauche	1.3	if (length & 1)
107	gbeauche	1.4	dest = source;
108	gbeauche	1.1	#endif
109	gbeauche	1.4
110			#undef DEREF_LONG_PTR
111			#undef DEREF_WORD_PTR
112	gbeauche	1.1	}
113
114			#undef FB_FUNC_NAME
115
116			#ifdef FB_BLIT_1
117			#undef FB_BLIT_1
118			#endif
119
120			#ifdef FB_BLIT_2
121			#undef FB_BLIT_2
122	gbeauche	1.5	#endif
123
124			#ifdef FB_BLIT_4
125			#undef FB_BLIT_4
126	gbeauche	1.1	#endif
127
128			#ifdef FB_DEPTH
129			#undef FB_DEPTH
130			#endif