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{
fpGUI - Free Pascal GUI Library
fpIMG interface declarations. This is the main glue code between
different fpIMG submodules such as ImageIO and fpGFX.
Copyright (C) 2000 - 2006 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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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