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248 lines
13 KiB
XML
248 lines
13 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="gluScaleImage">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>gluScaleImage</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>gluScaleImage</refname>
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<refpurpose>scale an image to an arbitrary size</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>GLint <function>gluScaleImage</function></funcdef>
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<paramdef>GLenum <parameter>format</parameter></paramdef>
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<paramdef>GLsizei <parameter>wIn</parameter></paramdef>
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<paramdef>GLsizei <parameter>hIn</parameter></paramdef>
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<paramdef>GLenum <parameter>typeIn</parameter></paramdef>
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<paramdef>const void * <parameter>dataIn</parameter></paramdef>
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<paramdef>GLsizei <parameter>wOut</parameter></paramdef>
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<paramdef>GLsizei <parameter>hOut</parameter></paramdef>
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<paramdef>GLenum <parameter>typeOut</parameter></paramdef>
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<paramdef>GLvoid* <parameter>dataOut</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>format</parameter></term>
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<listitem>
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<para>
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Specifies the format of the pixel data.
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The following symbolic values are valid:
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<constant>GLU_COLOR_INDEX</constant>,
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<constant>GLU_STENCIL_INDEX</constant>,
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<constant>GLU_DEPTH_COMPONENT</constant>,
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<constant>GLU_RED</constant>,
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<constant>GLU_GREEN</constant>,
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<constant>GLU_BLUE</constant>,
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<constant>GLU_ALPHA</constant>,
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<constant>GLU_RGB</constant>,
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<constant>GLU_RGBA</constant>,
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<constant>GLU_BGR</constant>,
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<constant>GLU_BGRA</constant>,
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<constant>GLU_LUMINANCE</constant>, and
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<constant>GLU_LUMINANCE_ALPHA</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>wIn</parameter></term>
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<term><parameter>hIn</parameter></term>
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<listitem>
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<para>
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Specify in pixels the width and height, respectively, of the source image.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>typeIn</parameter></term>
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<listitem>
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<para>
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Specifies the data type for <parameter>dataIn</parameter>. Must be one of
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<constant>GLU_UNSIGNED_BYTE</constant>,
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<constant>GLU_BYTE</constant>,
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<constant>GLU_BITMAP</constant>,
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<constant>GLU_UNSIGNED_SHORT</constant>,
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<constant>GLU_SHORT</constant>,
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<constant>GLU_UNSIGNED_INT</constant>,
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<constant>GLU_INT</constant>,
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<constant>GLU_FLOAT</constant>,
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<constant>GLU_UNSIGNED_BYTE_3_3_2</constant>,
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<constant>GLU_UNSIGNED_BYTE_2_3_3_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_5_5_1</constant>,
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<constant>GLU_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8_REV</constant>,
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<constant>GLU_UNSIGNED_INT_10_10_10_2</constant>, or
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<constant>GLU_UNSIGNED_INT_2_10_10_10_REV</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dataIn</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the source image.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>wOut</parameter></term>
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<term><parameter>hOut</parameter></term>
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<listitem>
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<para>
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Specify the width and height, respectively, in pixels of the destination image.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>typeOut</parameter></term>
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<listitem>
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<para>
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Specifies the data type for <parameter>dataOut</parameter>. Must be one of
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<constant>GLU_UNSIGNED_BYTE</constant>,
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<constant>GLU_BYTE</constant>,
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<constant>GLU_BITMAP</constant>,
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<constant>GLU_UNSIGNED_SHORT</constant>,
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<constant>GLU_SHORT</constant>,
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<constant>GLU_UNSIGNED_INT</constant>,
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<constant>GLU_INT</constant>,
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<constant>GLU_FLOAT</constant>,
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<constant>GLU_UNSIGNED_BYTE_3_3_2</constant>,
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<constant>GLU_UNSIGNED_BYTE_2_3_3_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_5_5_1</constant>,
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<constant>GLU_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8_REV</constant>,
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<constant>GLU_UNSIGNED_INT_10_10_10_2</constant>, or
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<constant>GLU_UNSIGNED_INT_2_10_10_10_REV</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dataOut</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the destination image.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>gluScaleImage</function> scales a pixel image using the appropriate pixel store modes to
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unpack data from the source image and pack data into the destination image.
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</para>
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<para>
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When shrinking an image, <function>gluScaleImage</function> uses a box filter to sample the source image
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and create pixels for the destination image. When magnifying an image,
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the pixels from the source image are linearly interpolated to create the
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destination image.
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</para>
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<para>
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A return value of zero indicates success, otherwise a GLU error code is returned (see <citerefentry><refentrytitle>gluErrorString</refentrytitle></citerefentry>).
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</para>
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<para>
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See the <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry> reference page for a description of
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the acceptable values for the <parameter>format</parameter>, <parameter>typeIn</parameter>, and <parameter>typeOut</parameter> parameters.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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Formats <constant>GLU_BGR</constant>, and <constant>GLU_BGRA</constant>, and types
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<constant>GLU_UNSIGNED_BYTE_3_3_2</constant>,
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<constant>GLU_UNSIGNED_BYTE_2_3_3_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_6_5_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4</constant>,
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
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<constant>GLU_UNSIGNED_SHORT_5_5_5_1</constant>,
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<constant>GLU_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8</constant>,
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<constant>GLU_UNSIGNED_INT_8_8_8_8_REV</constant>,
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<constant>GLU_UNSIGNED_INT_10_10_10_2</constant>, and
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<constant>GLU_UNSIGNED_INT_2_10_10_10_REV</constant> are only available if the GL version
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is 1.2 or greater.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GLU_INVALID_VALUE</constant> is returned if <parameter>wIn</parameter>, <parameter>hIn</parameter>, <parameter>wOut</parameter>, or <parameter>hOut</parameter>
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is negative.
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</para>
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<para>
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<constant>GLU_INVALID_ENUM</constant> is returned if <parameter>format</parameter>, <parameter>typeIn</parameter>, or <parameter>typeOut</parameter> is not
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legal.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_BYTE_3_3_2</constant> or <constant>GLU_UNSIGNED_BYTE_2_3_3_REV</constant>
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and <parameter>format</parameter> is not <constant>GLU_RGB</constant>.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_SHORT_5_6_5</constant> or <constant>GLU_UNSIGNED_SHORT_5_6_5_REV</constant>
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and <parameter>format</parameter> is not <constant>GLU_RGB</constant>.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_SHORT_4_4_4_4</constant> or <constant>GLU_UNSIGNED_SHORT_4_4_4_4_REV</constant>
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and <parameter>format</parameter> is neither <constant>GLU_RGBA</constant> nor <constant>GLU_BGRA</constant>.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_SHORT_5_5_5_1</constant> or <constant>GLU_UNSIGNED_SHORT_1_5_5_5_REV</constant>
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and <parameter>format</parameter> is neither <constant>GLU_RGBA</constant> nor <constant>GLU_BGRA</constant>.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_INT_8_8_8_8</constant> or <constant>GLU_UNSIGNED_INT_8_8_8_8_REV</constant>
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and <parameter>format</parameter> is neither <constant>GLU_RGBA</constant> nor <constant>GLU_BGRA</constant>.
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</para>
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<para>
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<constant>GLU_INVALID_OPERATION</constant> is returned if <parameter>typeIn</parameter> or <parameter>typeOut</parameter> is
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<constant>GLU_UNSIGNED_INT_10_10_10_2</constant> or <constant>GLU_UNSIGNED_INT_2_10_10_10_REV</constant>
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and <parameter>format</parameter> is neither <constant>GLU_RGBA</constant> nor <constant>GLU_BGRA</constant>.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>gluBuild1DMipmaps</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluBuild2DMipmaps</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluBuild3DMipmaps</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluErrorString</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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