1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
{
x86 format converters for HERMES
Some routines Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
Some routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
{ _Convert*_S
Paramters:
ESI = source
EDI = dest
ECX = amount (NOT 0!!! (the _ConvertX86 routine checks for that though))
EDX = x increment
Destroys:
EAX, EBX, ECX, EDX
}
procedure ConvertX86p32_16RGB565_S(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
pushl %ebp
pushl %edx // increment now at [esp+4]!
movl $0,%ebp
pushl %ecx
shrl $1,%ecx
jnz .L_ok
jmp .L_final
.L_ok:
.balign 8
.Lx:
movl %ebp,%eax
shrl $14,%eax
addl 4(%esp),%ebp
movl %ebp,%edx
andl $0x0fffffffc,%eax
shrl $14,%edx
movl (%esi,%eax),%ebx // ebx = pixel one
andl $0x0fffffffc,%edx
andl $0x0f8fcf8,%ebx
shrb $2,%bh
movl (%esi,%edx),%eax // eax = pixel two
andl $0x0f8fcf8,%eax
addl 4(%esp),%ebp
shrb $2,%ah // eax & ebx= rrrrr000|00gggggg|bbbbb000
movl %eax,%edx
shrw $3,%dx
andl $0x0f80000,%eax
shrl $8,%eax
orl %edx,%eax
shll $16,%eax
movl %ebx,%edx
shrw $3,%dx
andl $0x0f80000,%ebx
shrl $8,%ebx
orb %dh,%ah
orb %bh,%ah
orb %dl,%al
movl %eax,(%edi)
addl $4,%edi
decl %ecx
jnz .Lx
.L_final:
popl %ecx
andl $1,%ecx
jz .L_out
shrl $14,%ebp // trailing pixel
andl $0x0fffffffc,%ebp
movl (%esi,%ebp),%eax
movl (%esi,%ebp),%ebx
shrl $8,%ebx
andl $0x0fcf8,%eax
shrb $2,%ah
andl $0x0f800,%ebx
shrl $3,%eax
orl %ebx,%eax
movw %ax,(%edi)
addl $2,%edi
.L_out:
popl %edx
popl %ebp
jmp _X86RETURN_S
end;
|
