{ 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;