本文整理自网络，侵删。
unit ScreenGetPaletteEntries;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
ButtonReadpf8bit: TButton;
Memo1: TMemo;
Image2: TImage;
procedure ButtonReadpf8bitClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
CONST
MaxPixelCount = 65536;
TYPE
TRGBArray = ARRAY[0..MaxPixelCount-1] OF TRGBTriple;
pRGBArray = ^TRGBArray;
procedure TForm1.ButtonReadpf8bitClick(Sender: TObject);
VAR
i : CARDINAL;
index : BYTE;
j : CARDINAL;
LogicalPalette : TMaxLogPalette;
PaletteEntryCount: CARDINAL;
Bitmap8 : TBitmap;
Bitmap24 : TBitmap;
Row8 : pByteArray;
Row24 : pRGBArray;
begin
Bitmap8 := TBitmap.Create;
TRY
Bitmap8.LoadFromFile('Deer.BMP');
// Show pf8bit Bitmap
Image1.Picture.Graphic := Bitmap8;
IF Bitmap8.PixelFormat <> pf8bit
THEN ShowMessage('Expecting 8-bits/pixel BMP');
IF Bitmap8.Palette = 0
THEN ShowMessage ('No Palette with BMP')
ELSE BEGIN
PaletteEntryCount := GetPaletteEntries(Bitmap8.Palette, 0, 255,
LogicalPalette.palPalEntry);
FOR i := 0 TO PaletteEntryCount-1 DO
BEGIN
Memo1.Lines.Add(Format('%3.3d %3.3d %3.3d %3.3d %d',
[i, LogicalPalette.palPalEntry[i].peRed,
LogicalPalette.palPalEntry[i].peGreen,
LogicalPalette.palPalEntry[i].peBlue,
LogicalPalette.palPalEntry[i].peFlags]))
END;
Bitmap24 := TBitmap.Create;
TRY
Bitmap24.Width := Bitmap8.Width;
Bitmap24.Height := Bitmap8.Height;
Bitmap24.PixelFormat := pf24bit;
FOR j := 0 TO Bitmap8.Height-1 DO
BEGIN
Row8 := Bitmap8.Scanline[j];
Row24 := Bitmap24.Scanline[j];
FOR i := 0 TO Bitmap8.Width-1 DO
BEGIN
index := Row8[i]; // index in palette array
WITH Row24[i] DO
BEGIN
rgbtRed := LogicalPalette.palPalEntry[index].peRed;
rgbtGreen := LogicalPalette.palPalEntry[index].peGreen;
rgbtBlue := LogicalPalette.palPalEntry[index].peBlue
END
END
END;
// Save to new BMP
Bitmap24.SaveToFile('Deer24.BMP');
// Show 24-bit BMP (without a palette now)
Image2.Picture.Graphic := Bitmap24;
FINALLY
Bitmap24.Free
END
END
FINALLY
Bitmap8.Free
END
end;
end.
相关阅读 >>
d10环境下调用hidcontroller1.0.35获取数据乱码问题
更多相关阅读请进入《Delphi》频道 >>
