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{
fpImg - Free Pascal Imaging Library
Copyright (C) 2000 by
Areca Systems GmbH / Sebastian Guenther, sg@freepascal.org
fpImg interface declarations;
this is the main glue code between different fpImg submodules
such as ImageIO and fpGFX.
See the file COPYING, included in this distribution,
for details about the copyright.
This program 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.
}
unit fpImg;
{$IFDEF Debug}
{$ASSERTIONS On}
{$ENDIF}
interface
uses Classes, GFXBase, ImageIO;
function CreateImageFromFile(AScreen: TGfxScreen; AReader: TImageReaderClass;
const AFilename: String): TGfxImage;
function CreateImageFromStream(AScreen: TGfxScreen; AReader: TImageReaderClass;
AStream: TStream): TGfxImage;
implementation
function CreateImageFromFile(AScreen: TGfxScreen; AReader: TImageReaderClass;
const AFilename: String): TGfxImage;
var
Stream: TFileStream;
begin
Stream := TFileStream.Create(AFilename, fmOpenRead);
try
Result := CreateImageFromStream(AScreen, AReader, Stream);
finally
Stream.Free;
end;
end;
function CreateImageFromStream(AScreen: TGfxScreen; AReader: TImageReaderClass;
AStream: TStream): TGfxImage;
var
Reader: TImageReader;
Data: Pointer;
Stride: LongWord;
Palette: TGfxPalette;
begin
Reader := AReader.Create;
try
Reader.ProcessHeaderData(AStream);
Result := AScreen.Display.CreateImage(Reader.Width, Reader.Height,
Reader.PixelFormat);
if Reader.PaletteSize > 0 then
begin
Palette := AScreen.CreatePalette(Reader.PaletteSize,
Reader.Palette);
try
Result.Palette := Palette;
finally
Palette.Release;
end;
end;
try
Result.Lock(Data, Stride);
try
Reader.SetImageSegmentBuffer(Data, Stride, Reader.Height);
Reader.ProcessImageData(AStream);
finally
Result.Unlock;
end;
except
Result.Free;
raise;
end;
finally
Reader.Free;
end;
end;
end.
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