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{
Free Pascal port of the OpenPTC C++ library.
Copyright (C) 2001-2007, 2009-2012 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
}
type
TPTCFormat = class(TInterfacedObject, IPTCFormat)
private
FFormat: THermesFormat;
function GetHermesFormat: PHermesFormat;
function Equals(AFormat: IPTCFormat): Boolean; reintroduce;
function GetR: Uint32;
function GetG: Uint32;
function GetB: Uint32;
function GetA: Uint32;
function GetBits: Integer;
function GetIndexed: Boolean;
function GetDirect: Boolean;
function GetBytes: Integer;
public
constructor Create;
constructor Create(ABits: Integer);
constructor Create(ABits: Integer;
ARedMask, AGreenMask, ABlueMask: Uint32;
AAlphaMask: Uint32 = 0);
constructor Create(AFormat: IPTCFormat);
destructor Destroy; override;
// procedure Assign(const format: TPTCFormat);
{ property R: Uint32 read GetR;
property G: Uint32 read GetG;
property B: Uint32 read GetB;
property A: Uint32 read GetA;
property Bits: Integer read GetBits;
property Indexed: Boolean read GetIndexed;
property Direct: Boolean read GetDirect;
property Bytes: Integer read GetBytes;}
end;
class function TPTCFormatFactory.CreateNew: IPTCFormat;
begin
Result := TPTCFormat.Create;
end;
class function TPTCFormatFactory.CreateNew(ABits: Integer): IPTCFormat;
begin
Result := TPTCFormat.Create(ABits);
end;
class function TPTCFormatFactory.CreateNew(ABits: Integer;
ARedMask, AGreenMask, ABlueMask: Uint32;
AAlphaMask: Uint32 = 0): IPTCFormat;
begin
Result := TPTCFormat.Create(ABits, ARedMask, AGreenMask, ABlueMask, AAlphaMask);
end;
class function TPTCFormatFactory.CreateNew(AFormat: IPTCFormat): IPTCFormat;
begin
Result := TPTCFormat.Create(AFormat);
end;
constructor TPTCFormat.Create;
begin
{ defaults }
FFormat.r := 0;
FFormat.g := 0;
FFormat.b := 0;
FFormat.a := 0;
FFormat.bits := 0;
FFormat.indexed := False;
{ initialize hermes }
if not Hermes_Init then
raise TPTCError.Create('could not initialize hermes');
end;
constructor TPTCFormat.Create(ABits: Integer);
begin
{ check bits per pixel }
if ABits <> 8 then
raise TPTCError.Create('unsupported bits per pixel');
{ indexed color }
FFormat.r := 0;
FFormat.g := 0;
FFormat.b := 0;
FFormat.a := 0;
FFormat.bits := ABits;
FFormat.indexed := True;
{ initialize hermes }
if not Hermes_Init then
raise TPTCError.Create('could not initialize hermes');
end;
constructor TPTCFormat.Create(ABits: Integer;
ARedMask, AGreenMask, ABlueMask: Uint32;
AAlphaMask: Uint32 = 0);
begin
{ check bits per pixel }
if ((ABits and 7) <> 0) or (ABits <= 0) or (ABits > 32) then
raise TPTCError.Create('unsupported bits per pixel');
{ direct color }
FFormat.r := ARedMask;
FFormat.g := AGreenMask;
FFormat.b := ABlueMask;
FFormat.a := AAlphaMask;
FFormat.bits := ABits;
FFormat.indexed := False;
{ initialize hermes }
if not Hermes_Init then
raise TPTCError.Create('could not initialize hermes');
end;
constructor TPTCFormat.Create(AFormat: IPTCFormat);
begin
{ initialize hermes }
if not Hermes_Init then
raise TPTCError.Create('could not initialize hermes');
Hermes_FormatCopy(AFormat.GetHermesFormat, @FFormat)
end;
{$INFO TODO: check what happens if Hermes_Init blows up in the constructor...}
destructor TPTCFormat.Destroy;
begin
Hermes_Done;
inherited Destroy;
end;
function TPTCFormat.GetHermesFormat: PHermesFormat;
begin
Result := @Fformat;
end;
{procedure TPTCFormat.Assign(const format: TPTCFormat);
begin
if Self = format then
exit;
Hermes_FormatCopy(@format.Fformat, @Fformat);
end;}
function TPTCFormat.Equals(AFormat: IPTCFormat): Boolean;
begin
Result := Hermes_FormatEquals(AFormat.GetHermesFormat, @FFormat);
end;
function TPTCFormat.GetR: Uint32;
begin
Result := FFormat.r;
end;
function TPTCFormat.GetG: Uint32;
begin
Result := FFormat.g;
end;
function TPTCFormat.GetB: Uint32;
begin
Result := FFormat.b;
end;
function TPTCFormat.GetA: Uint32;
begin
Result := FFormat.a;
end;
function TPTCFormat.GetBits: Integer;
begin
Result := FFormat.bits;
end;
function TPTCFormat.GetIndexed: Boolean;
begin
Result := FFormat.indexed;
end;
function TPTCFormat.GetDirect: Boolean;
begin
Result := not FFormat.indexed;
end;
function TPTCFormat.GetBytes: Integer;
begin
Result := FFormat.bits shr 3;
end;
|
