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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[90]: TGPImage(10) - 獲取圖像的調色板信息

再學GDI+[90]: TGPImage(10) - 獲取圖像的調色板信息

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, Grids;
type
 TForm1 = class(TForm)
  DrawGrid1: TDrawGrid;
  OpenDialog1: TOpenDialog;
  Button1: TButton;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure Button1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, Math;
var
 img: TGPImage;
procedure TForm1.FormCreate(Sender: TObject);
begin
 {調整 DrawGrid1 顯示效果}
 with DrawGrid1 do
 begin
  Align := alRight;
  Width := 180;
  FixedCols := 0;
  FixedRows := 0;
  DefaultColWidth := 10;
  DefaultRowHeight := 10;
  ColCount := 0;
  RowCount := 1;
  DefaultDrawing := False;
  ScrollBars := ssNone;
 end;
 Button1.Left := ClientWidth - DrawGrid1.Width - Button1.Width;
 Button1.Top := 0;
 img := TGPImage.Create;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 g := TGPGraphics.Create(Self.Canvas.Handle);
 g.DrawImage(img, 0, 0, img.GetWidth, img.GetHeight);
 g.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
 Palette: PColorPalette; {調色板指針}
 ColorNum: Integer;   {調色板中的顏色總數}
 Colors: PGPColor;    {調色板中的顏色數組指針}
 i: Integer;
begin
 OpenDialog1.Filter := 'All (*.png;*.gif;*.bmp;*.tif;*.jpg)|*.png;*.gif;*.bmp;*.tif;*.jpg';
 if not OpenDialog1.Execute then Exit;
 img.Free;
 img := TGPImage.Create(OpenDialog1.FileName);
 Text := ExtractFileName(OpenDialog1.FileName);
 {為調色板分配內存}
 GetMem(Palette, img.GetPaletteSize);
 {獲取調色板數據}
 img.GetPalette(Palette, img.GetPaletteSize);
 DrawGrid1.ColCount := 0;
 DrawGrid1.RowCount := 1;
 if Palette^.Count = 0 then
 begin
  ShowMessage('此圖片沒有調色板');
  Exit;
 end;
 ColorNum := Palette^.Count;
 Colors := @Palette.Entries; {調色板中顏色數組的指針}
 if ColorNum < 16 then DrawGrid1.ColCount := ColorNum else
 begin
  DrawGrid1.ColCount := 16;
  DrawGrid1.RowCount := ColorNum div 16;
 end;
 DrawGrid1.Refresh; {不刷新不行}
 for i := 0 to ColorNum - 1 do
 begin
  DrawGrid1.Canvas.Brush.Color := ARGBToColorRef(Colors^);
  DrawGrid1.Canvas.FillRect(DrawGrid1.CellRect(i mod 16, i div 16));
  Inc(Colors);
 end;
 FreeMem(Palette);
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 187
 ClientWidth = 400
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object DrawGrid1: TDrawGrid
  Left = 192
  Top = 8
  Width = 193
  Height = 137
  TabOrder = 0
 end
 object Button1: TButton
  Left = 8
  Top = 8
  Width = 75
  Height = 25
  Caption = 'Button1'
  TabOrder = 1
  OnClick = Button1Click
 end
 object OpenDialog1: TOpenDialog
  Left = 96
  Top = 8
 end
end

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