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| unit Unit1;
{$mode objfpc}{$H+}
interface
uses
{$IFDEF LINUX}
BaseUnix, // timespec
Linux, // clock_gettime
{$ENDIF}
LCLtype, LCLintf, Classes, SysUtils, FileUtil, Forms, Controls, Graphics,
Math,
Dialogs, ExtCtrls, StdCtrls;
type
{ TForm1 }
TForm1 = class(TForm)
Button1: TButton;
Image1: TImage;
Image2: TImage;
Panel1: TPanel;
rdg2: TRadioGroup;
rdg1: TRadioGroup;
procedure Button1Click(Sender: TObject);
procedure rdg1SelectionChanged(Sender: TObject);
procedure rdg2SelectionChanged(Sender: TObject);
private
{ private declarations }
public
{ public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
type
TColor2Grayscale = (
c2gAverage,
c2gLightness,
c2gLuminosity
);
TBitmapAccess = (
baScanLine,
baPixels
);
var
c2g: TColor2Grayscale;
ba : TBitmapAccess;
R,G,B: byte;
const
ONE_OVER_MILLION = 1E-6; // micro
ONE_OVER_MILLIER = 1E-3; // milli
{$IFDEF LINUX}
function GetTickCount64: QWord;
var
tp: timespec; // timespec record tv_sec seconds tv_nsec nanoseconds
begin
//clock_gettime(CLOCK_MONOTONIC, @tp); // orig
clock_gettime(CLOCK_MONOTONIC_RAW, @tp);
// multiplier les secondes par 1000 pour pouvoir y ajouter les millisec,
// multiplier les secondes par 1000000 pour pouvoir y ajouter les microsec,
// multiplier les secondes par 1000000000 pour pouvoir y ajouter les nanosec
// du coup le "result" sera le nombre de nsec depuis le démarrage de la machine
Result := (Int64(tp.tv_sec) * 1000000000) + int64(tp.tv_nsec);
end;
{$ENDIF}
function RGBToGray(R, G, B: byte; cg: TColor2Grayscale): TColor;
var
res: Uint;
begin
case cg of
c2gAverage:
res := (R + G + B) div 3;
c2gLightness:
res := ( max(max(R, G), B) + min(min(R, G), B) ) div 2;
c2gLuminosity:
res := round(0.2989*R + 0.5870*G + 0.1141*B); // coeffs from Matlab
else
raise Exception.Create('Unknown Color2Grayscale value');
end;
Result := RGBtoColor(res,res,res);
end;
procedure ColorToGray(aBitmap: Graphics.TBitmap;
cg: TColor2Grayscale;
ba: TBitmapAccess);
var
w, h: UInt;
x: byte;
CurrRow, OffSet: UInt;
pRed, pGreen, pBlue: PByte;
StartTime, StopTime, Delta : QWord;
BW,BH: integer;
begin
{$IFDEF LINUX}
StartTime := GetTickCount64;
{$ENDIF}
BW := aBitmap.Width -1; //Prevent Repeated Calls to TBitMap.Width -- trouvé chez efg
BH := aBitmap.Height-1; //Prevent Repeated Calls to TBitMap.Height
if ba = baPixels then
begin
if aBitmap <> nil then
for h := 0 to BH do
for w := 0 to BW do begin
RedGreenBlue(aBitmap.Canvas.Pixels[w,h], R,G,B);
aBitmap.Canvas.Pixels[w,h] := RGBToGray(R,G,B, cg);
end;
end
else // ba = baScanLine
begin
if aBitmap.PixelFormat <> pf24bit then
raise Exception.Create(
'Not implemented. PixelFormat has to be "pf24bit"');
aBitmap.BeginUpdate();
CurrRow := UInt(aBitmap.RawImage.GetLineStart(0));
OffSet := UInt(aBitmap.RawImage.GetLineStart(1)) - CurrRow;
for h := 0 to BH do
begin
for w := 0 to BW do
begin
pBlue := pByte(CurrRow + w*3);
pGreen := pByte(CurrRow + w*3 + 1);
pRed := pByte(CurrRow + w*3 + 2);
x := RGBToGray(pRed^, pGreen^, pBlue^, cg);
pBlue^ := x;
pGreen^ := x;
pRed^ := x;
end;
inc(CurrRow, OffSet);
end;
aBitmap.EndUpdate();
end;
{$IFDEF LINUX}
StopTime := GetTickCount64;
Delta := StopTime - StartTime;
Form1.Caption := FloatToStr(Delta * ONE_OVER_MILLIER) + ' microsecondes';
{$ENDIF}
end;
{ TForm1 }
procedure TForm1.Button1Click(Sender: TObject);
begin
image1.Picture.Bitmap.LoadFromFile(Application.Location + '150x100x24x72_v2.bmp');
image2.Picture.Bitmap.Assign(image1.Picture.Bitmap);
ColorToGray(image2.Picture.Bitmap, c2g, ba);
end;
procedure TForm1.rdg1SelectionChanged(Sender: TObject);
begin
case rdg1.ItemIndex of
0: c2g := c2gAverage;
1: c2g := c2gLightness;
2: c2g := c2gLuminosity;
end;
end;
procedure TForm1.rdg2SelectionChanged(Sender: TObject);
begin
case rdg2.ItemIndex of
0: ba := baScanLine;
1: ba := baPixels;
end;
end;
end. |
[Graphisme -- Linux] Travailler avec TBitmap.RawImage : l'enfer sur Terre
Répondre avec citation
Envoyé par mm_71
de telles erreurs à ce niveau.
Yves,
) mais au lieu d'afficher des traductions ascii, je regroupe les bytes et je fais afficher des pixels coloriés, 
)
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