(*******************************************************************
*
* TTCalc2.Inc 1.2
*
* Arithmetic and Vectorial Computations (inline assembly)
* This version is used for the OS/2 Virtual Pascal compiler
*
* Copyright 1996 David Turner, Robert Wilhelm and Werner Lemberg
*
* This file is part of the FreeType project, and may only be used
* modified and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
* NOTES : All vector operations were moved to the interpreter
*
******************************************************************)
(**********************************************************)
(* *)
(* The following routines are inline assembly, they are *)
(* thus processor and bitness specific. Replace them *)
(* with your own if you want to port the TrueType Engine *)
(* We need unsigned longints to perform correctly our additions *)
(* we include inline assembly to get them, baaahhh .. *)
(**********************************************************)
(* 64 Bit Addition *)
procedure Add64( var X, Y, Z : Int64 ); assembler;
{&USES ebx, edx}
asm
mov ebx,[X].dword
mov eax,[ebx]
mov edx,[ebx+4]
mov ebx,[Y].dword
add eax,[ebx]
adc edx,[ebx+4]
mov ebx,[Z].dword
mov [ebx],eax
mov [ebx+4],edx
end;
(**********************************************************)
(* 64 Bit Substraction *)
procedure Sub64( var X, Y, Z : Int64 ); assembler;
{&USES ebx, edx}
asm
mov ebx,[X].dword
mov eax,[ebx]
mov edx,[ebx+4]
mov ebx,[Y].dword
sub eax,[ebx]
sbb edx,[ebx+4]
mov ebx,[Z].dword
mov [ebx],eax
mov [ebx+4],edx
end;
(**********************************************************)
(* Multiply two Int32 to an Int64 *)
procedure MulTo64( X, Y : Int32; var Z : Int64 ); assembler;
{&USES ebx, edx }
asm
mov ebx,[Z].dword
mov eax,[X]
imul dword ptr [Y]
mov [ebx],eax
mov [ebx+4],edx
end;
(**********************************************************)
(* Divide an Int64 by an Int32 *)
function Div64by32( var X : Int64; Y : Int32 ) : Int32; assembler;
{&USES ebx, edx}
asm
mov ebx, [X].dword
mov eax, [ebx]
mov edx, [ebx+4]
idiv dword ptr [Y]
end;
procedure DivMod64by32( var X : Int64; Y : Int32; var Q, R : Int32 );
assembler; {&USES ebx, edx}
asm
mov ebx, [X].dword
mov eax, [ebx]
mov edx, [ebx+4]
idiv dword ptr [Y]
mov ebx, [Q].dword
mov [ebx], eax
mov ebx, [R].dword
mov [ebx], edx
end;