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{
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
}
{ _Copy*
Paramters:
ESI = source
EDI = dest
ECX = amount (NOT 0!!! (the _ConvertX86 routine checks for that though))
Destroys:
EAX, EBX, EDX
}
procedure CopyX86p_4byte(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
rep
movsl
jmp _X86RETURN
end;
procedure CopyX86p_1byte(CONVERT_PARAMETERS); cdecl; nostackframe; forward;
procedure CopyX86p_3byte; cdecl; nostackframe; assembler;
asm
leal (%ecx,%ecx,2),%ecx
jmp CopyX86p_1byte
end;
procedure CopyX86p_2byte(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
testl $3,%edi // Check if video memory is aligned
jz .L_ALIGNED
movw (%esi),%ax
addl $2,%esi
movw %ax,(%edi)
addl $2,%edi
decl %ecx
jz .L3
.L_ALIGNED:
movl %ecx,%ebx // Save ecx for later
shrl $1,%ecx
jz .L2
rep
movsl
.L2:
andl $1,%ebx
jz .L3
movw (%esi),%ax
addl $2,%esi
movw %ax,(%edi)
addl $2,%edi
.L3:
jmp _X86RETURN
end;
procedure CopyX86p_1byte(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
.L_alignloop:
testl $3,%edi
jz .L_aligned
movb (%esi),%al
incl %esi
movb %al,(%edi)
incl %edi
decl %ecx
jz .L4
jmp .L_alignloop
.L_aligned:
movl %ecx,%edx
shrl $2,%ecx
jz .L2
rep
movsl
.L2:
movl %edx,%ecx // Get the remaining pixels to draw
andl $3,%ecx
jz .L4 // width was modulo 4
.L3:
movb (%esi),%al
incl %esi
movb %al,(%edi)
incl %edi
decl %ecx
jnz .L3
.L4:
jmp _X86RETURN
end;
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