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{
Free Pascal port of the Hermes C library.
Copyright (C) 2001-2003 Nikolay Nikolov (nickysn@users.sourceforge.net)
Original C version by Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
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.
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
}
{
C surface clearing routines for the HERMES library
Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
This source code is licensed under the GNU LGPL
Please refer to the file COPYING.LIB contained in the distribution for
licensing conditions
}
Procedure ClearP_32(iface : PHermesClearInterface); CDecl;
Var
count : DWord;
value : int32;
dest : Pchar8;
Begin
value := iface^.value;
dest := iface^.dest;
Repeat
count := iface^.width;
Repeat
Pint32(dest)^ := value;
Inc(dest, 4);
Dec(count);
Until count = 0;
Inc(dest, iface^.add);
Dec(iface^.height);
Until iface^.height = 0;
End;
Procedure ClearP_24(iface : PHermesClearInterface); CDecl;
Var
p_value : Pchar8;
count : DWord;
dest : Pchar8;
Begin
p_value := @iface^.value;
dest := iface^.dest;
Repeat
count := iface^.width;
Repeat
(dest + R_24)^ := (p_value + B_32)^;
(dest + G_24)^ := (p_value + G_32)^;
(dest + B_24)^ := (p_value + B_32)^;
Inc(dest, 3);
Dec(count);
Until count = 0;
Inc(dest, iface^.add);
Dec(iface^.height);
Until iface^.height = 0;
End;
Procedure ClearP_16(iface : PHermesClearInterface); CDecl;
Var
value32 : DWord;
countshifted, count : DWord;
dest : Pchar8;
Begin
value32 := (iface^.value Shl 16) Or (iface^.value And $ffff);
dest := iface^.dest;
Repeat
count := iface^.width;
{ Align destination }
If (PtrUInt(dest) And $3) <> 0 Then
Begin
Pshort16(dest)^ := iface^.value;
Inc(dest, 2);
Dec(count);
End;
countshifted := count Shr 1;
While countshifted <> 0 Do
Begin
Dec(countshifted);
Pint32(dest)^ := value32;
Inc(dest, 4);
End;
If (count And 1) <> 0 Then
Begin
Pshort16(dest)^ := iface^.value;
Inc(dest, 2);
End;
Inc(dest, iface^.add);
Dec(iface^.height);
Until iface^.height = 0;
End;
{$GOTO ON}
Procedure ClearP_8(iface : PHermesClearInterface); CDecl;
Label
yloop;
Var
count, shiftcount : DWord;
value32 : int32;
value : char8;
dest : Pchar8;
Begin
dest := iface^.dest;
value := iface^.value And $ff;
value32 := (value Shl 24) Or (value Shl 16) Or (value Shl 8) Or value;
Repeat
count := iface^.width;
While (PtrUInt(dest) And $3) <> 0 Do { Align to dword boundary }
Begin
dest^ := value;
Inc(dest);
Dec(count);
If count = 0 Then
Goto yloop; { GOTO's are nice ;) }
End;
shiftcount := count Shr 2;
While shiftcount <> 0 Do
Begin
Dec(shiftcount);
Pint32(dest)^ := value32;
Inc(dest, 4);
End;
count := count And $3;
While count <> 0 Do
Begin
Dec(count);
dest^ := value;
Inc(dest);
End;
yloop:
Inc(dest, iface^.add);
Dec(iface^.height);
Until iface^.height = 0;
End;
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