BlitzPlus GetColor() equivalent...
BlitzMax Forums/BlitzMax Beginners Area/BlitzPlus GetColor() equivalent...
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| I'd like to pick the green (or red, blue) color of a x,y value of a pixmap. In BlitzPlus there's GetColor(x,y) and ColorGreen(), but that doesn't work in BlitzMax. I think I'll have to use ReadPixel(), but I obtain a 32bit value with rgb and alpha. How can I do to separate the green in a int variable ? What's the difference between a TPixmap and a TImage ? Can I convert one to the other ? Why are two types to handle pictures ? Thank you very much. |
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| - a pixmap is stored in 'normal' system memory. - an image is stored in video memory, on the video card itself. What this means: - Pixmaps are slow to draw, since before drawing you'll need to upload them from normal RAM to video RAM - since images are stored in video memory, out of reach of your program, you cannot make changes to an image - If you need to change it, you'll have to use a pixmap, make the changes in normal memory, and re-upload it to the video memory either by converting it back to an image or by using drawpixmap (which does the same in the background) As far as red/green/blue: pixcolor=ReadPixel(workpix,xx,yy) pixred=(pixcolor & $00FF0000) Shr 16 pixgreen=(pixcolor & $0000FF00) Shr 8 pixblue=(pixcolor & $000000FF) |
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