Sack Library Documentation
sack::image::IMG_ADDRESS Macro
#define IMG_ADDRESS(i,x,y) ((CDATA*) \
                               ((i)->image + (( (x) - (i)->eff_x ) \
    +(((i)->flags&IF_FLAG_INVERTED)?(INVERTY_INVERTED( (i), (y) ) * (i)->pwidth ):(INVERTY_NON_INVERTED( (i), (y) ) * (i)->pwidth )) \
                               ))   \
Image to get the color buffer address of 
x coordinate of pixel to get address of 
y coordinate of pixel to get address of 

The address of the pixel in the color buffer.

A macro to compute the address of a pixel in the color buffer by x, y.

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