On 24.02.2013 11:44, Michael Van Canneyt wrote:
srcImg:=TFPMemoryImage.Create(0,0);Do not use TFPMemoryImage. It is a catch-all memory format, not optimized at all, using 64 bits for the images. Instead, use e.g. TFPCompactImgRGBA8Bit if you need alpha or TFPCompactImgRGB8Bit if you do not need Alpha.
Nice, I did not know we have more compact image types available. O.o
dstImg:=TFPMemoryImage.Create(iX,iY); dstImg.UsePalette:=false; dstCanvas:=TFPImageCanvas.create(dstImg); dstCanvas.StretchDraw(0,0,iX,iY,srcImg);Phew, this is also a real killer. Do not draw on a canvas with stretchdraw. That will be slow as well; Rather, attempt to manipulate the image in memory by doing a stretch directly. Choose an algorithm which is fast. The default interpolation will result in quite a lot of calculations.
Maybe a collection of algorithms for in memory rescaling would be nice... Regards, Sven _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
