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{
Free Pascal port of the OpenPTC C++ library.
Copyright (C) 2001-2003, 2006, 2007, 2009-2011 Nikolay Nikolov (nickysn@users.sourceforge.net)
Original C++ version by Glenn Fiedler (ptc@gaffer.org)
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
}
constructor TPTCClear.Create;
begin
{ initialize hermes }
if not Hermes_Init then
raise TPTCError.Create('could not initialize hermes');
{ default current format }
FFormat := TPTCFormat.Create;
{ create hermes clearer instance }
FHandle := Hermes_ClearerInstance;
{ check hermes clearer instance }
if FHandle = nil then
raise TPTCError.Create('could not create hermes clearer instance');
end;
destructor TPTCClear.Destroy;
begin
{ return the clearer instance }
Hermes_ClearerReturn(FHandle);
{ free hermes }
Hermes_Done;
inherited Destroy;
end;
procedure TPTCClear.Request(AFormat: IPTCFormat);
var
hermes_format: PHermesFormat;
begin
hermes_format := AFormat.GetHermesFormat;
{ request surface clear for this format }
if not Hermes_ClearerRequest(FHandle, hermes_format) then
raise TPTCError.Create('unsupported clear format');
{ update current format }
FFormat := AFormat;
end;
procedure TPTCClear.Clear(APixels: Pointer; AX, AY, AWidth, AHeight, APitch: Integer; AColor: IPTCColor);
var
r, g, b, a: LongInt;
index: LongInt;
begin
if APixels = nil then
raise TPTCError.Create('nil pixels pointer in clear');
{ check format type }
if FFormat.direct then
begin
{ check color type }
if not AColor.direct then
raise TPTCError.Create('direct pixel formats can only be cleared with direct color');
{ setup clear color }
r := Trunc(AColor.R * 255);
g := Trunc(AColor.G * 255);
b := Trunc(AColor.B * 255);
a := Trunc(AColor.A * 255);
{ clamp red }
if r > 255 then
r := 255
else
if r < 0 then
r := 0;
{ clamp green }
if g > 255 then
g := 255
else
if g < 0 then
g := 0;
{ clamp blue }
if b > 255 then
b := 255
else
if b < 0 then
b := 0;
{ clamp alpha }
if a > 255 then
a := 255
else
if a < 0 then
a := 0;
{ perform the clearing }
Hermes_ClearerClear(FHandle, APixels, AX, AY, AWidth, AHeight, APitch,
r, g, b, a);
end
else
begin
{ check color type }
if not AColor.indexed then
raise TPTCError.Create('indexed pixel formats can only be cleared with indexed color');
{ setup clear index }
index := AColor.index;
{ clamp color index }
if index > 255 then
index := 255
else
if index < 0 then
index := 0;
{ perform the clearing }
Hermes_ClearerClear(FHandle, APixels, AX, AY, AWidth, AHeight, APitch,
0, 0, 0, index);
end;
end;
|
