2d image rotation

[daydreamer]

Gonna start 2d rotation image
Might continue to uncompressed movie rotations

Anyone already done this?

[avcaballero]

> Anyone already done this?

Yes

http://abreojosensamblador.epizy.com/?Tarea=5&SubTarea=6#Rotozoomer

[daydreamer]

Thanks caballero

[daydreamer]

First easy with rotate objects,lines
If i am restricted by 1024*768 ,showing 1024*1024 or bigger
C Break out of loop?much branch misprediction ?
So i want to try
Pixelshader inverse coding
So loop only 1024*768

[daydreamer]

I am trying to make a 8:24 fixed point solution on x, y together is used as pointer to where bmp2 new pixel appears
Kinda scanning from middle of bitmap bmp1 outwards
Got problem with suddenly result switch to negative- values, signbit probably doesnt work correctly when shift 8:24 fixed point using shift 24
Deltax =int (cos (alpha) *2^24) and deltay=int (sin (alpha)*2^24)

[daydreamer]

I take a break from this
One idea want to try is rotate rle encoded bitmap = mean of all lengths * faster rotation