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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
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
}
type
PClearerInstance = ^TClearerInstance;
TClearerInstance = record
format: PHermesFormat;
func: THermesClearPtr;
end;
function Hermes_ClearerInstance: THermesClearerHandle;
var
newinstance: PClearerInstance;
begin
New(newinstance);
newinstance^.func := nil;
newinstance^.format := Hermes_FormatNewEmpty;
Result := THermesClearerHandle(newinstance);
end;
procedure Hermes_ClearerReturn(handle: THermesClearerHandle);
begin
if handle <> nil then
begin
Hermes_FormatFree(PClearerInstance(handle)^.format);
Dispose(PClearerInstance(handle));
end;
end;
function Hermes_ClearerRequest(handle: THermesClearerHandle; format: PHermesFormat): Boolean;
var
clr: PClearerInstance;
i: Integer;
begin
if handle = nil then
begin
Result := False;
exit;
end;
clr := PClearerInstance(handle);
{ if the clearer is the same, return 1 }
if Hermes_FormatEquals(clr^.format, format) then
begin
Result := True;
exit;
end;
{ Otherwise look for a new clearer }
clr^.func := nil;
for i := 0 to numClearers - 1 do
begin
if Clearers[i]^.bits = format^.bits then
begin
clr^.func := Clearers[i]^.func;
Hermes_FormatCopy(format, clr^.format);
Result := True;
exit;
end;
end;
Result := False;
end;
function Hermes_ClearerClear(handle: THermesClearerHandle; pixels: Pointer;
x1, y1, width, height, pitch: Integer;
r, g, b: Uint32; index: Uint8): Boolean;
var
info: THermesGenericInfo;
clr: PClearerInstance;
pixelval, d_r, d_g, d_b, d_a: Uint32;
iface: THermesClearInterface;
begin
if (height <= 0) or (width <= 0) then
begin
Result := True;
exit;
end;
if handle = nil then
begin
Result := False;
exit;
end;
clr := PClearerInstance(handle);
{ No conversion function assigned }
if clr^.func = nil then
begin
Result := False;
exit;
end;
if clr^.format^.indexed then
pixelval := index
else
begin
Hermes_Calculate_Generic_Info(24, 16, 8, 32,
Hermes_Topbit(clr^.format^.r),
Hermes_Topbit(clr^.format^.g),
Hermes_Topbit(clr^.format^.b),
Hermes_Topbit(clr^.format^.a), @info);
pixelval := (index shl 24) or (r shl 16) or (g shl 8) or b;
d_r := ((pixelval shr info.r_right) shl info.r_left) and clr^.format^.r;
d_g := ((pixelval shr info.g_right) shl info.g_left) and clr^.format^.g;
d_b := ((pixelval shr info.b_right) shl info.b_left) and clr^.format^.b;
d_a := ((pixelval shr info.a_right) shl info.a_left) and clr^.format^.a;
pixelval := d_r or d_g or d_b or d_a;
end;
iface.dest := pixels;
Inc(iface.dest, y1*pitch + x1*(clr^.format^.bits shr 3));
iface.width := width;
iface.height := height;
iface.add := pitch - width * (clr^.format^.bits shr 3);
iface.value := pixelval;
{ Optimization }
if iface.add = 0 then
begin
iface.width := iface.width * iface.height;
iface.height := 1;
end;
clr^.func(@iface);
Result := True;
end;
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