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_getpixel(3alleg4) [osx man page]

_getpixel(3alleg4)						  Allegro manual						_getpixel(3alleg4)

_getpixel, _getpixel15, _getpixel16, _getpixel24, _getpixel32 - Faster specific version of getpixel(). Allegro game programming library. SYNOPSIS
#include <allegro.h> int _getpixel(BITMAP *bmp, int x, int y); int _getpixel15(BITMAP *bmp, int x, int y); int _getpixel16(BITMAP *bmp, int x, int y); int _getpixel24(BITMAP *bmp, int x, int y); int _getpixel32(BITMAP *bmp, int x, int y); DESCRIPTION
Faster inline versions of getpixel() for specific color depths. These won't work in mode-X, and don't do any clipping, so you must make sure the point lies inside the bitmap. RETURN VALUE
Returns the value of the pixel in the color format you specified. SEE ALSO
getpixel(3alleg4) Allegro version 4.4.2 _getpixel(3alleg4)

Check Out this Related Man Page

getpixel(3alleg4)                                                 Allegro manual                                                 getpixel(3alleg4)

getpixel - Reads a pixel from a bitmap. Allegro game programming library. SYNOPSIS
#include <allegro.h> int getpixel(BITMAP *bmp, int x, int y); DESCRIPTION
Reads a pixel from point (x, y) in the bitmap. RETURN VALUE
Returns -1 if the point lies outside the bitmap (ignoring the clipping rectangle), otherwise the value of the pixel in the color format of the bitmap. Warning: -1 is also a valid value for pixels contained in 32-bit bitmaps with alpha channel (when R,G,B,A are all equal to 255) so you can't use the test against -1 as a predicate for such bitmaps. In this cases, the only reliable predicate is is_inside_bitmap(). To extract the individual color components, use the getr() / getg() / getb() / geta() family of functions. SEE ALSO
putpixel(3alleg4), _getpixel(3alleg4), is_inside_bitmap(3alleg4), getr(3alleg4), getg(3alleg4), getb(3alleg4), geta(3alleg4), ex12bit(3alleg4), exalpha(3alleg4), exflame(3alleg4), exlights(3alleg4) Allegro version 4.4.2 getpixel(3alleg4)
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