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gluScaleImage - scale an image to an arbitrary size
GLint
gluScaleImage( GLenum format,
GLsizei wIn,
GLsizei hIn,
GLenum typeIn,
const void *dataIn,
GLsizei wOut,
GLsizei hOut,
GLenum typeOut,
GLvoid* dataOut )
eqn not supported
- format
- Specifies the 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, GL_BGRA, GL_LUMINANCE, and GL_LUMINANCE_ALPHA.
- wIn, hIn
- Specify
in pixels the width and height, respectively, of the source image.
- typeIn
- 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, 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
- Specifies a pointer to the source image.
- wOut, hOut
- Specify the width
and height, respectively, in pixels of the destination image.
- typeOut
- 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, 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
- Specifies
a pointer to the destination image.
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.
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.
GLU_INVALID_VALUE is
returned if wIn, hIn, wOut, or hOut 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.
glDrawPixels(3G)
, glReadPixels(3G)
,
gluBuild1DMipmaps(3G)
, gluBuild2DMipmaps(3G)
, gluBuild3DMipmaps(3G)
,
gluErrorString(3G)
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