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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fgluScaleImage</STRONG> - scale an image to an arbitrary size <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> INTEGER*4 <STRONG>fgluScaleImage</STRONG>( INTEGER*4 <EM>format</EM>, INTEGER*4 <EM>wIn</EM>, INTEGER*4 <EM>hIn</EM>, INTEGER*4 <EM>typeIn</EM>, void <EM>dataIn</EM>, INTEGER*4 <EM>wOut</EM>, INTEGER*4 <EM>hOut</EM>, INTEGER*4 <EM>typeOut</EM>, CHARACTER*8 <EM>dataOut</EM> ) <STRONG>PARAMETERS</STRONG> <EM>format</EM> Specifies the format of the pixel data. The following symbolic values are valid: <STRONG>GL_COLOR_INDEX</STRONG>, <STRONG>GL_STENCIL_INDEX</STRONG>, <STRONG>GL_DEPTH_COMPONENT</STRONG>, <STRONG>GL_RED</STRONG>, <STRONG>GL_GREEN</STRONG>, <STRONG>GL_BLUE</STRONG>, <STRONG>GL_ALPHA</STRONG>, <STRONG>GL_RGB</STRONG>, <STRONG>GL_RGBA</STRONG>, <STRONG>GL_LUMINANCE</STRONG>, and <STRONG>GL_LUMINANCE_ALPHA</STRONG>. <EM>wIn</EM>, <EM>hIn</EM> Specify the width and height, respectively, of the source image that is scaled. <EM>typeIn</EM> Specifies the data type for <EM>dataIn</EM>. Must be one of <STRONG>GL_UNSIGNED_BYTE</STRONG>, <STRONG>GL_BYTE</STRONG>, <STRONG>GL_BITMAP</STRONG>, <STRONG>GL_UNSIGNED_SHORT</STRONG>, <STRONG>GL_SHORT</STRONG>, <STRONG>GL_UNSIGNED_INT</STRONG>, <STRONG>GL_INT</STRONG>, or <STRONG>GL_FLOAT</STRONG>. <EM>dataIn</EM> Specifies a pointer to the source image. <EM>wOut</EM>, <EM>hOut</EM> Specify the width and height, respectively, of the destination image. <EM>typeOut</EM> Specifies the data type for <EM>dataOut</EM>. Must be one of <STRONG>GL_UNSIGNED_BYTE</STRONG>, <STRONG>GL_BYTE</STRONG>, <STRONG>GL_BITMAP</STRONG>, <STRONG>GL_UNSIGNED_SHORT</STRONG>, <STRONG>GL_SHORT</STRONG>, <STRONG>GL_UNSIGNED_INT</STRONG>, <STRONG>GL_INT</STRONG>, or <STRONG>GL_FLOAT</STRONG>. <EM>dataOut</EM> Specifies a pointer to the destination image. <STRONG>DESCRIPTION</STRONG> <STRONG>fgluScaleImage</STRONG> 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, <STRONG>fgluScaleImage</STRONG> uses a box filter to sample the source image and create pixels for the destination image. When magnifying an image, the pixels from the source image are linearly interpolated to create the destination image. A return value of 0 indicates success, otherwise a GLU error code is returned (see <STRONG>fgluErrorString</STRONG>). See the <STRONG>glReadPixels</STRONG> reference page for a description of the acceptable values for <EM>format</EM>, <EM>typeIn</EM>, and <EM>typeOut</EM>. <STRONG>ERRORS</STRONG> <STRONG>GLU_INVALID_VALUE</STRONG> is returned if <EM>wIn</EM>, <EM>hIn</EM>, <EM>wOut</EM>, or <EM>hOut</EM> are < 0. <STRONG>GLU_INVALID_ENUM</STRONG> is returned if <EM>format</EM>, <EM>typeIn</EM>, or <EM>typeOut</EM> are not legal. <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>glDrawPixels</STRONG>, <STRONG>glReadPixels</STRONG>, <STRONG>fgluBuild1DMipmaps</STRONG>, <STRONG>fgluBuild2DMipmaps</STRONG>, <STRONG>fgluErrorString</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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