coldboy
asked on
problem with picture format
I want to stretch picture and save it by BMP format (to add into a Imagelist). If the source picture contain a bitmap, this code work correctly:
Procedure Newpicture(Source:Tpicture
var i,j:integer;
begin
DesBMP.width:=newW;
DesBMP.height:=newH;
For i:=0 to newW-1 do
for j:=0 to newH-1 do
with Source.bitmap do
DesBMP.canvas.pixels[i,j]:
end;
But the problem come with me if source picture contain a Metal Image or a JPEG Image. If JPEGImage, I can use SaveToClipboardFormat and then use tmpBMP(another Tbitmap).LoadFromClipboard
Procedure Newpicture(Source:Tpicture
var i,j:integer;
begin
DesBMP.width:=newW;
DesBMP.height:=newH;
For i:=0 to newW-1 do
for j:=0 to newH-1 do
with Source.bitmap do
DesBMP.canvas.pixels[i,j]:
end;
But the problem come with me if source picture contain a Metal Image or a JPEG Image. If JPEGImage, I can use SaveToClipboardFormat and then use tmpBMP(another Tbitmap).LoadFromClipboard
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ASKER
I'm testing your answer...
ASKER
Excellent! But can you show me why I can do by that way? (or how Strechdraw work?)
I don't know how it works. I just knows it works. :-) And a bit faster than when you yourself go walking through the bitmap, pixel by pixel, as you tried to do.
I'm not an expert at handling graphical formats but I do know that using the Pixel property will slow down your application enormously. There are faster techniques for this but I just don't know them. (Something with scanlines and things like that.)
I'm not an expert at handling graphical formats but I do know that using the Pixel property will slow down your application enormously. There are faster techniques for this but I just don't know them. (Something with scanlines and things like that.)
DesBMP.Canvas.Draw(0,0,Sou
???