GLPIXELZOOM(3G) UNIX Programmer's Manual GLPIXELZOOM(3G)
NAME
glPixelZoom - specify the pixel zoom factors
C SPECIFICATION
void glPixelZoom( GLfloat xfactor,
GLfloat yfactor )
PARAMETERS
xfactor, yfactor Specify the x and y zoom factors for pixel
write operations.
DESCRIPTION
glPixelZoom specifies values for the x and y zoom factors.
During the execution of glDrawPixels or glCopyPixels, if
(xr, yr) is the current raster position, and a given element
is in the mth row and nth column of the pixel rectangle,
then pixels whose centers are in the rectangle with corners
at
(xr + n.xfactor, yr + m.yfactor)
(xr + (n+1).xfactor, yr + (m+1).yfactor)
are candidates for replacement. Any pixel whose center lies
on the bottom or left edge of this rectangular region is
also modified.
Pixel zoom factors are not limited to positive values. Nega-
tive zoom factors reflect the resulting image about the
current raster position.
ERRORS
GL_INVALID_OPERATION is generated if glPixelZoom is executed
between the execution of glBegin and the corresponding exe-
cution of glEnd.
ASSOCIATED GETS
glGet with argument GL_ZOOM_X
glGet with argument GL_ZOOM_Y
SEE ALSO
glCopyPixels(3G), glDrawPixels(3G)
MirBSD #10-current Printed 2021-12-07 1