glPixelZoom(3) Mac OS X Manual Page

Mac Dev Center Mac OS X Reference Library General Mac OS X Man Pages

This manual page is for Mac OS X version 10.6.3

If you are running a different version of Mac OS X, view the documentation locally:

In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

For more information about the manual page format, see the manual page for manpages(5).
For more information about this technology, look for other documentation in the Apple Reference Library.
For general information about writing shell scripts, read Shell Scripting Primer.


GLPIXELZOOM(3G)                                                                              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 rect-angular rectangular
       angular 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(3G), glDrawPixels(3G)




                                                                                             GLPIXELZOOM(3G)

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors: Report errors in the content of this documentation to the OpenGL project.
Bug reports: Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems: Report formatting mistakes in the online version of these pages with the feedback links below.

Did this document help you?