On November 16, 2002 05:31 pm, Aaron Ardiri wrote:
> pixel quadrupling :) the original demo is actually 40x40 :)
I did a very similar thing with my fractal demo - it's only rendering 1/2 of
the screen. Fact is, I made several versions of it that range from 1:1, 1:2,
1:4, and 4:1 (anti-aliasing by rendering subpixels). The 4:1 got really,
really slow even on a damn fast desktop machine w/ the emulator, so I
eventually went with 1:2. My routine went something like this:
screen = (MemPtr)WinScreenLock(NULL);
WinScreenUnlock();
for each pixel on the screen (0..160 x 0..160)
calculate color (0-255 greyscale)
PutPixel ( screen, x/2, y/2, color )
end
inline void PutPixel ( UInt8 *bmp, UInt8 x, UInt8 y, UInt8 c ) {
if ( (x<SCREEN_W) && (y<SCREEN_W) ) {
if ( bmp[(y<<5)+(y<<7)+x] == 0 ) {
bmp[(y<<5)+(y<<7)+x] = c;
} else { // remove this if you don't want to average
// the following is slow, but allows "anti-aliasing"
bmp[(y<<5)+(y<<7)+x] = (bmp[(y<<5)+(y<<7)+x] + c)>>1;
}
}
}
--
Matthew (Darkstorm) Bevan [EMAIL PROTECTED]
Margin Software, NECTI. http://www.marginsoftware.com
Re-inventing the wheel, every time.
- Pascal Users:
To show respect for the 313th anniversary (tomorrow) of the
death of Blaise Pascal, your programs will be run at half speed.
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