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{
x86 format converters for HERMES
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_*
Paramters:
ESI = source
EDI = dest
ECX = amount (NOT 0!!! (the ConvertX86 routine checks for that though))
Destroys:
EAX, EBX, EDX
}
procedure ConvertX86pI8_32(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
xorl %ebx,%ebx
movl 36(%ebp),%edx
.L1:
movb (%esi),%bl
incl %esi
movl (%edx,%ebx,4),%eax
movl %eax,(%edi)
addl $4,%edi
decl %ecx
jnz .L1
jmp _X86RETURN
end;
procedure ConvertX86pI8_24(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
movl 36(%ebp),%ebx
xorl %edx,%edx
// check short
cmpl $32,%ecx
ja .L3
.L1: // short loop
movb (%esi),%dl
movl (%ebx,%edx,4),%eax
movb %al,(%edi) // blue
movb %ah,1(%edi) // green
shrl $16,%eax
movb %al,2(%edi) // red
incl %esi
addl $3,%edi
decl %ecx
jnz .L1
.L2:
jmp _X86RETURN
.L3: // head
movl %edi,%eax
andl $0b11,%eax
jz .L4
movb (%esi),%dl
movl (%ebx,%edx,4),%eax
movb %al,(%edi) // blue
movb %ah,1(%edi) // green
shrl $16,%eax
movb %al,2(%edi) // red
incl %esi
addl $3,%edi
decl %ecx
jmp .L3
.L4: // save ebp
pushl %ebp
movl %ebx,%ebp
// save count
pushl %ecx
// unroll 4 times
shrl $2,%ecx
.L5: pushl %ecx // save ecx
movb (%esi),%dl // index to "A"
movl (%ebp,%edx,4),%eax // eax = [xx][A2][A1][A0]
shll $8,%eax // eax = [A2][A1][A0][xx]
movb 1(%esi),%dl // index to "B"
movb (%ebp,%edx,4),%al // eax = [A2][A1][A0][B0]
rorl $8,%eax // eax = [B0][A2][A1][A0] (done)
movl %eax,(%edi)
movl (%ebp,%edx,4),%eax // eax = [xx][B2][B1][B0]
shll $8,%eax // eax = [B2][B1][B0][xx]
movb 3(%esi),%dl // index to "D"
movl (%ebp,%edx,4),%ecx // ecx = [xx][D2][D1][D0]
shll $8,%ecx // ecx = [D2][D1][D0][xx]
movb 2(%esi),%dl // index to "C"
movb 1(%ebp,%edx,4),%ah // eax = [B2][B1][C1][xx]
movb (%ebp,%edx,4),%al // eax = [B2][B1][C1][C0]
rorl $16,%eax // eax = [C1][C0][B2][B1] (done)
movb 2(%ebp,%edx,4),%cl // ecx = [D2][D1][D0][C2] (done)
movl %eax,4(%edi)
movl %ecx,8(%edi)
addl $4,%esi
addl $3*4,%edi
popl %ecx // restore ecx
decl %ecx
jnz .L5
// tail
popl %ecx
andl $0b11,%ecx
jz .L7
.L6:
movb (%esi),%dl
movl (%ebx,%edx,4),%eax
movb %al,(%edi) // blue
movb %ah,1(%edi) // green
shrl $16,%eax
movb %al,2(%edi) // red
incl %esi
addl $3,%edi
decl %ecx
jnz .L6
.L7: popl %ebp
jmp _X86RETURN
end;
procedure ConvertX86pI8_16(CONVERT_PARAMETERS); cdecl; nostackframe; assembler;
asm
xorl %ebx,%ebx
movl 36(%ebp),%edx
testl $3,%edi
jz .Laligned
movb (%esi),%bl
movl (%edx,%ebx,4),%eax
incl %esi
movw %ax,(%edi)
addl $2,%edi
decl %ecx
jz .LOut
.Laligned:
pushl %ecx
xorl %eax,%eax
xorl %ebx,%ebx
shrl $1,%ecx
jz .Last_pixel
.balign 8
.Ly:
movb 1(%esi),%bl
movb (%esi),%al
movl (%edx,%ebx,4),%ebx
addl $2,%esi
shll $16,%ebx
movl (%edx,%eax,4),%eax
orl %ebx,%eax
xorl %ebx,%ebx
movl %eax,(%edi)
addl $4,%edi
xorl %eax,%eax
decl %ecx
jnz .Ly
.Last_pixel:
popl %ecx
testb $1,%cl
jz .LOut
movb (%esi),%bl
movl (%edx,%ebx,4),%eax
incl %esi
movw %ax,(%edi)
addl $2,%edi
.LOut:
jmp _X86RETURN
end;
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