Tao.OpenGl SDK Documentation

Glu.gluScaleImage Method (Int32, Int32, Int32, Int32, Byte[], Int32, Int32, Int32, Byte[])

Scales an image to an arbitrary size.

[Visual Basic]
Overloads Public Shared Function gluScaleImage( _
   ByVal format As Integer, _
   ByVal widthIn As Integer, _
   ByVal heightIn As Integer, _
   ByVal typeIn As Integer, _
   ByVal dataIn As Byte(), _
   ByVal widthOut As Integer, _
   ByVal heightOut As Integer, _
   ByVal typeOut As Integer, _
   ByVal dataOut As Byte() _
) As Integer
[C#]
public static int gluScaleImage(
   int format,
   int widthIn,
   int heightIn,
   int typeIn,
   byte[] dataIn,
   int widthOut,
   int heightOut,
   int typeOut,
   byte[] dataOut
);

Parameters

format
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_BGR_EXT, GL_BGRA_EXT, GL_LUMINANCE, and GL_LUMINANCE_ALPHA.
widthIn
The width of the source image that is scaled.
heightIn
The height of the source image that is scaled.
typeIn
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, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV.
dataIn
A pointer to the source image.
widthOut
The width of the destination image.
heightOut
The height of the destination image.
typeOut
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, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, or GL_UNSIGNED_INT_2_10_10_10_REV.
dataOut
A pointer to the destination image.

Return Value

A return value of zero indicates success, otherwise a GLU error code is returned (see gluErrorString).

Remarks

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 magnifying an image, the pixels from the source image are linearly interpolated to create the destination image.

A return value of zero indicates success, otherwise a GLU error code is returned (see gluErrorString).

See the glReadPixels reference page for a description of the acceptable values for the format, typeIn, and typeOut parameters.

NOTES

Formats GL_BGR, and GL_BGRA, and types GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV are only available if the GL version is 1.2 or greater.

ERRORS

GLU_INVALID_VALUE is returned if widthIn, heightIn, widthOut, or heightOut is negative.

GLU_INVALID_ENUM is returned if format, typeIn, or typeOut is not legal.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_BYTE_3_3_2 or GL_UNSIGNED_BYTE_2_3_3_REV and format is not GL_RGB.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_SHORT_5_6_5 or GL_UNSIGNED_SHORT_5_6_5_REV and format is not GL_RGB.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_SHORT_4_4_4_4 or GL_UNSIGNED_SHORT_4_4_4_4_REV and format is neither GL_RGBA nor GL_BGRA.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_SHORT_5_5_5_1 or GL_UNSIGNED_SHORT_1_5_5_5_REV and format is neither GL_RGBA nor GL_BGRA.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_INT_8_8_8_8 or GL_UNSIGNED_INT_8_8_8_8_REV and format is neither GL_RGBA nor GL_BGRA.

GLU_INVALID_OPERATION is returned if typeIn or typeOut is GL_UNSIGNED_INT_10_10_10_2 or GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA nor GL_BGRA.

See Also

Glu Class | Tao.OpenGl Namespace | Glu.gluScaleImage Overload List | glDrawPixels | glReadPixels | gluBuild1DMipmaps | gluBuild2DMipmaps | gluBuild3DMipmaps | gluErrorString