glPixelZoom(3G)glPixelZoom(3G)NAMEglPixelZoom - specify the pixel zoom factors
GLfloat yfactor );
Specify the x and y zoom factors for pixel write operations.
DESCRIPTIONglPixelZoom() 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 cdot xfactor, yr + m . yfactor) (xr +
(n+1) . xfactor, yr + (m+1) cdot yfactor)
are candidates for replacement. Any pixel whose center lies on the bot‐
tom or left edge of this rectangular region is also modified.
Pixel zoom factors are not limited to positive values. Negative zoom
factors reflect the resulting image about the current raster position.
GL_INVALID_OPERATION is generated if glPixelZoom() is executed between
the execution of glBegin() and the corresponding execution of glEnd().
ASSOCIATED GETSglGet() with argument GL_ZOOM_X
glGet() with argument GL_ZOOM_Y
SEE ALSOglCopyPixels(3) ,glDrawPixels(3)glPixelZoom(3G)