HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 394

S gluScaleImage gluScaleImage gluScaleImage: scale an image to an arbitrary size. C Specification GLint gluScaleImage( GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut) Parameters format wIn, hIn typeIn dataIn wOut, hOut typeOut dataOut Specifies the format of the pixel data. The following symbolic values are valid: GL_COLOR_INDEX, GL_STENCIL_INDEX, GL_DEPTH_COMPONENT, GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and GL_LUMINANCE_ALPHA. Specify the width and height, respectively, of the source image that is scaled. Specifies the data type for dataIn. Must be one of GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, or GL_FLOAT. Specifies a pointer to the source image. Specify the width and height, respectively, of the destination image. Specifies the data type for dataOut. Must be one of GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, or GL_FLOAT. Specifies a pointer to the destination image. Description gluScaleImage scales a pixel image using the appropriate pixel store modes to unpack data from the source image and pack data into the destination image. When shrinking an image, gluScaleImage uses a box filter to sample the source image and create pixels for the destination image. When an image is magnified, the pixels from the source image are linearly interpolated to create the destination image. 394 Chapter 17