bitmap, load and save.
lazarus / 39-Graphics

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marmin · 2005-03-17 23:21

Problem!


  form1.canvas.brush.color:= clBlack;
  BitMap1 := TBitMap.create;
  Bitmap1.Loadfromfile('test1.bmp');  
  bitmap1.canvas.moveto(1,1); bitmap1.canvas.lineto(4,4);
  bitmap1.savetofile('test2.bmp');

gives'Acces Violation' run-time error , when writing.
If I omit the pixel edit , things work perfectly.
Could this be anything to do with a DDB? help.

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Lightning · 2005-03-18 11:01

What version of Laz/FPC are you using ?

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marmin · 2005-03-18 19:48

ohoh.. This is a Lazarus bug.

I have just tested the same code in Delphi 6 and it's working fine.

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marmin · 2005-03-19 03:34

ah i d-loaded the latest snapshot and it's fixed ! nice work. cuz I
was working on a nice Lazarus Icon Editor-

bitmaps still give strange color conversion results.

- what is the format of an Icon for Linux?
- how can I convert tcolor to tfpcolor?

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Nisbo · 2005-03-19 13:14

mmmm sorry but it doesnt work on my site

Image1.Picture.Bitmap.SaveToFile('TestBitmap.bmp');

TestBitmap.bmp is a black picture

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Nisbo · 2005-03-21 15:45

no idea ? Bitmap --> SaveToFile buggy ?

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marmin · 2005-03-21 18:35

I don't think it's the savetofile. (I'm working in win32).
The problem occurs when doing a canvas operation, like rectangle.
Saving the win32 bitmap gives strange color results.
xpm files editing, loading and saving, however, work.