glPixelZoom man page on RedHat
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GLPIXELZOOM(3G) OpenGL 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. Negative 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 execution of glEnd().
ASSOCIATED GETS
glGet() with argument GL_ZOOM_X
glGet() with argument GL_ZOOM_Y
SEE ALSO
glCopyPixels(), glDrawPixels()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLPIXELZOOM(3G)
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