Blitz3D Docs -> 2D - Category -> Graphics -> CopyPixelFast
Parameters:src_x - x-coordinate of source pixel to copy from
src_y - y-coordinate of source pixel to copy from
src_buffer - name of buffer to copy from, e.g. ImageBuffer()
dest_x - x-coordinate of destination pixel to copy to
dest_y - y-coordinate of destination pixel to copy to
dest_buffer (optional) - name of buffer to copy to, e.g. BackBuffer()
You *must* use this command on a locked buffer, otherwise the command will fail. See LockBuffer.
Also, you must make sure that the coordinates that you are copying from and to are valid, otherwise you will end up overwriting other areas of memory.
By not following the above advice, you may cause your computer to crash.
See also: CopyPixel.
; CopyPixel/CopyPixelFast Example ; ------------------------------- Graphics 640,480,16 Print "Press a key to use CopyPixel to copy the top half of an image to the frontbuffer" WaitKey() ; Load an image - can be anything pic=LoadImage("media/blitz_pic.bmp") ; Use CopyPixel to copy the top half of the image to the frontbuffer For y=0 To ImageHeight(pic)/2 For x=0 To ImageWidth(pic) CopyPixel x,y,ImageBuffer(pic),x,y Next Next Locate 0,GraphicsHeight()/2 Print "Press a key to use CopyPixelFast to copy the bottom half of the image" Print "Once this has finished, you can then press a key to end the program" WaitKey() ; Lock buffer before using CopyPixelFast LockBuffer ; Use CopyPixelFast to copy the bottom half of the image to the frontbuffer For y=0 To (ImageHeight(pic)/2)+ImageHeight(pic) For x=0 To ImageWidth(pic) CopyPixelFast x,y,ImageBuffer(pic),x,y Next Next ; Unlock buffer after using CopyPixelFast UnlockBuffer WaitKey()
| The bottom half of the image doesn't display in windowed mode, and I get an MAV. Works ok in fullscreen. I'm using Win7. |
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