Fast pixelwriting Userlib?

BlitzPlus Forums/BlitzPlus Programming/Fast pixelwriting Userlib?

JulianM (Posted 2008) [#1]

Hi, is there any userlib that acts like Writepixelfast but is faster? Thank you for your help, JM

Beaker (Posted 2008) [#2]

Have you tried pixel buffers: LockedPixels

JulianM (Posted 2008) [#3]

Thanks, but is there any good tutorial about this (LockedPixels)? It seems to be really complicated.

Beaker (Posted 2008) [#4]

This might help: B+ fast pixel functions made easy!

JulianM (Posted 2008) [#5]

Thank you, but my program isn't faster with those commands. Perhaps the main problem isn't the pixel drawing. Btw: Why is Rect that fast when painting the whole screen white? I mean it takes less than 0.5 ms. With Lockedpixels and a For-Loop it takes about 11ms.

andy_mc (Posted 2008) [#6]

What is your program trying to do? I think rect sends a complete instruction to the graphics card to draw a rectangle, instead of sending one pixel at a time like a for-loop does.

Beaker (Posted 2008) [#7]

You shouldn't use that code I linked to directly, but as a tutorial about how to get things working. That code just makes things easy, but isn't the fastest way to go about it. You should at least unroll/unwrap some of the functions, particularly FastWritePixelFormat1-4 and FastReadPixelFormat1-4. Also format checking should be done once only outside all loops (see FastWritePixel/FastReadPixel). A DLL will still be faster of course.