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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd">
<html
xmlns="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
><head><title>glBitmap</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glBindTexture.3G.xml" title="glBindTexture"/><link rel="next" href="glBlendColor.3G.xml" title="glBlendColor"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glBitmap</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glBindTexture.3G.xml">Prev</a></td><th width="60%" align="center">GL</th><td width="20%" align="right"><a accesskey="n" href="glBlendColor.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glBitmap.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glBitmap.3G-name"/><h2>Name</h2><p>glBitmap — draw a bitmap</p></div><div class="refsynopsisdiv"><a name="glBitmap.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void<tt>glBitmap</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLsizei<i><tt>width</tt></i>, GLsizei<i><tt>height</tt></i>, GLfloat<i><tt>xorig</tt></i>, GLfloat<i><tt>yorig</tt></i>, GLfloat<i><tt>xmove</tt></i>, GLfloat<i><tt>ymove</tt></i>, constGLubyte*<i><tt>bitmap</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glBitmap.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glBitmap</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>width</tt></i>, <i><tt>height</tt></i>, <i><tt>xorig</tt></i>, <i><tt>yorig</tt></i>, <i><tt>xmove</tt></i>, <i><tt>ymove</tt></i>, <i><tt>bitmap</tt></i>) →<tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glBitmap.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>width</tt></i>, <i><tt>height</tt></i></span></dt><dd>
Specify the pixel width and height of the bitmap image.
</dd><dt><span class="term"><i><tt>xorig</tt></i>, <i><tt>yorig</tt></i></span></dt><dd>
Specify the location of the origin in the bitmap image. The origin is measured from the lower left corner
of the bitmap, with right and up being the positive axes.
</dd><dt><span class="term"><i><tt>xmove</tt></i>, <i><tt>ymove</tt></i></span></dt><dd>
Specify the <i><tt>x</tt></i> and <i><tt>y</tt></i> offsets to be added to the current raster
position after the bitmap is drawn.
</dd><dt><span class="term"><i><tt>bitmap</tt></i></span></dt><dd>
Specifies the address of the bitmap image.
</dd></dl></div></div><div class="refsect1" lang="en"><a name="glBitmap.3G-description"/><h2>Description</h2><p>
A bitmap is a binary image. When drawn, the bitmap is positioned relative to the current raster position, and frame
buffer pixels corresponding to 1's in the bitmap are written using the current raster color or index. Frame buffer
pixels corresponding to 0's in the bitmap are not modified.
</p><p>
<tt>glBitmap</tt> takes seven arguments. The first pair specifies the width and height of the bitmap image.
The second pair specifies the location of the bitmap origin relative to the lower left corner of the bitmap image. The
third pair of arguments specifies <i><tt>x</tt></i> and <i><tt>y</tt></i> offsets to be added to the
current raster position after the bitmap has been drawn. The final argument is a pointer to the bitmap image itself.
</p><p>
The bitmap image is interpreted like image data for the <a href="glDrawPixels.3G.xml"><tt>glDrawPixels</tt></a> command,
with <i><tt>width</tt></i> and <i><tt>height</tt></i> corresponding to the width and height arguments of
that command, and with <i><tt>type</tt></i> set to <tt>GL_BITMAP</tt> and
<i><tt>format</tt></i> set to <tt>GL_COLOR_INDEX</tt>. Modes specified using <tt>glPixelStore</tt> affect the interpretation of bitmap image data; modes specified using
<tt>glPixelTransfer</tt> do not.
</p><p>
If the current raster position is invalid, <tt>glBitmap</tt> is ignored. Otherwise, the lower left corner
of the bitmap image is positioned at the window coordinates
</p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" mode="display" overflow="scroll">
<mml:mtable>
<mml:mtr>
<mml:mtd>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mi>w</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mfenced separator="," open="⌊" close="⌋">
<mml:mrow>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mi>r</mml:mi>
</mml:msub>
<mml:mo>-</mml:mo>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mi>o</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:msub>
<mml:mi>y</mml:mi>
<mml:mi>w</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mfenced separator="," open="⌊" close="⌋">
<mml:mrow>
<mml:msub>
<mml:mi>y</mml:mi>
<mml:mi>r</mml:mi>
</mml:msub>
<mml:mo>-</mml:mo>
<mml:msub>
<mml:mi>y</mml:mi>
<mml:mi>o</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
</mml:mtd>
</mml:mtr>
</mml:mtable>
</mml:math></div><p>
where <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mfenced separator=",">
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mi>r</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>y</mml:mi>
<mml:mi>r</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math> is the raster position and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mfenced separator=",">
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mi>o</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>y</mml:mi>
<mml:mi>o</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math> is the bitmap origin. Fragments are then generated for each pixel corresponding to a 1 (one) in the
bitmap image. These fragments are generated using the current raster <i><tt>z</tt></i> coordinate, color or
color index, and current raster texture coordinates. They are then treated just as if they had been generated by a
point, line, or polygon, including texture mapping,
</p><p>
fogging, and all per-fragment operations such as alpha and depth testing.
</p><p>
After the bitmap has been drawn, the <i><tt>x</tt></i> and <i><tt>y</tt></i> coordinates of the current
raster position are offset by <i><tt>xmove</tt></i> and <i><tt>ymove</tt></i>. No change is made to the
<i><tt>z</tt></i> coordinate of the current raster position, or to the current raster color, texture
coordinates, or index.
</p></div><div class="refsect1" lang="en"><a name="glBitmap.3G-notes"/><h2>Notes</h2><p>
To set a valid raster position outside the viewport, first set a valid raster position inside the viewport, then call
<tt>glBitmap</tt> with <tt>NULL</tt> as the <i><tt>bitmap</tt></i> parameter and with
<i><tt>xmove</tt></i> and <i><tt>ymove</tt></i> set to the offsets of the new raster position. This
technique is useful when panning an image around the viewport.
</p></div><div class="refsect1" lang="en"><a name="glBitmap.3G-errors"/><h2>Errors</h2><p>
<tt>GL_INVALID_VALUE</tt> is generated if <i><tt>width</tt></i> or <i><tt>height</tt></i> is
negative.
</p><p>
<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glBitmap</tt> is executed between the
execution of <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the corresponding execution of <a href="glBegin.3G.xml"><tt>glEnd</tt></a>.
</p></div><div class="refsect1" lang="en"><a name="glBitmap.3G-associated_gets"/><h2>Associated Gets</h2><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_POSITION</tt>
</p><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_COLOR</tt>
</p><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_DISTANCE</tt>
</p><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_INDEX</tt>
</p><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_TEXTURE_COORDS</tt>
</p><p>
<tt>glGet</tt> with argument <tt>GL_CURRENT_RASTER_POSITION_VALID</tt>
</p></div><div class="refsect1" lang="en"><a name="glBitmap.3G-see_also"/><h2>See Also</h2><p>
<span class="simplelist"><a href="glDrawPixels.3G.xml">glDrawPixels</a>, <a href="glPixelStore.3G.xml">glPixelStore</a>, <a href="glPixelTransfer.3G.xml">glPixelTransfer</a>, <a href="glRasterPos.3G.xml">glRasterPos</a></span>
</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glBindTexture.3G.xml">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="reference-GL.xml">Up</a></td><td width="40%" align="right"><a accesskey="n" href="glBlendColor.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glBindTexture</td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top">glBlendColor</td></tr></table></div></body></html>
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