219 lines
6.0 KiB
HTML
219 lines
6.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of Protocol::Ext::RENDER</TITLE>
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</HEAD><BODY>
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<H1>Protocol::Ext::RENDER</H1>
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Section: User Contributed Perl Documentation (3pm)<BR>Updated: 2004-04-03<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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X11::Protocol::Ext::RENDER - Perl module for the X Rendering Extension
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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use X11::Protocol;
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$x = X11::Protocol->new($ENV{'DISPLAY'});
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$x->init_extension('RENDER') or die;
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The <FONT SIZE="-1">RENDER</FONT> extension adds a new set of drawing primitives which
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effectively represent a replacement of the drawing routines in the
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core protocol, redesigned based on the needs of more modern
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clients. It adds long-desired features such as subpixel positioning,
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alpha compositing, direct specification of colors, and multicolored or
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animated cursors. On the other hand, it omits features that are no
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longer commonly used: wide lines, arbitrary polygons (only triangles
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and horizontally-aligned trapezoids are supported), ellipses, bitwise
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rendering operations, and server-side fonts (in favor of ``glyphs'' that
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are rendered on the client side and transmitted once).
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<P>
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As of this writing (early 2004), the specification and implementation
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both have rough edges, but there are relatively few alternatives for
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offloading fancy graphics processing to the server, as is necessary
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over slow links or if the client is written in a slow
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language. Another possibility you might consider is the 2D subset of
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OpenGL, though it doesn't yet have an X11::Protocol-compatible
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interface.
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<A NAME="lbAE"> </A>
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<H2>SYMBOLIC CONSTANTS</H2>
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This extension adds the constant types 'PictType', 'PictOp',
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'SubPixel', 'PolyEdge', and 'PolyMode', with values as defined in the
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standard.
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<A NAME="lbAF"> </A>
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<H2>REQUESTS</H2>
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This extension adds several requests, called as shown below:
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<P>
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<PRE>
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$x->RenderQueryVersion($major, $minor)
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=>
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($major, $minor)
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$x->RenderQueryPictFormats()
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=>
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([[$id, $type, $depth,
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$red, $red_m, $green, $green_m, $blue, $blue_m,
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$alpha, $alpha_m, $cmap], ...],
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[[$fallback, [$depth, [$visual, $format], ...], ...], ...],
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[$subpixel, ...])
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$x->RenderQueryPictIndexValues($pict_format)
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=>
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([$index, $red, $green, $blue, $alpha], ...)
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$x->RenderQueryFilters($drawable)
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=>
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([@filters], [@aliases])
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$x->RenderCreatePicture($picture, $drawable, $format,
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'attribute' => $value, ...)
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$x->RenderChangePicture($picture, 'attribute' => $value, ...)
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$x->RenderSetPictureClipRectangles($pic, $x_origin, $y_origin,
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[$x, $y, $width, $height], ...)
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$x->RenderSetPictureTransform($pict, $m11, $m12, $m13,
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$m21, $m22, $m23,
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$m31, $m32, $m33);
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$x->RenderSetPictureFilter($pict, $filter, @args)
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$x->RenderComposite($op, $src, $mask, $dst, $src_x, $src_y,
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$mask_x, $mask_y, $dst_x, $dst_y,
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$width, $height)
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$x->RenderFillRectangles($op, $dst, [$red, $green, $blue, $alpha],
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[$x, $y, $width, $height], ...)
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$x->RenderTrapezoids($op, $src, $src_x, $src_y, $dst, $mask_format,
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[$top, $bottom, $lx1, $ly1, $lx2, $ly2,
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$rx1, $ry1, $rx2, $ry2] ,...)
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$x->RenderTriangles($op, $src, $src_x, $src_y, $dst, $mask_format,
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[$x1, $y1, $x2, $y2, $x3, $y3])
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$x->RenderTriStrip($op, $src, $src_x, $src_y, $dst, $mask_format,
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[$x, $y], [$x, $y], [$x, $y], [$x, $y], ...)
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$x->RenderTriFan($op, $src, $src_x, $src_y, $dst, $mask_format,
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[$x, $y], [$x, $y], [$x, $y], [$x, $y], ...)
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$x->RenderCreateGlyphSet($gsid, $format)
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$x->RenderReferenceGlyphSet($gsid, $existing)
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$x->RenderFreeGlyphSet($gsid)
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$x->RenderAddGlyphs($gsid, [$glyph, $width, $height,
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$x, $y, $x_off, $y_off, $data], ...)
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</PRE>
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<P>
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Warning: with some server implementations (including XFree86 through 4.4)
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passing more than one glyph to AddGlyphs can hang or crash the server.
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So don't do that.
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<P>
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<PRE>
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$x->RenderFreeGylphs($gsid, @glyphs)
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$x->RenderCompositeGlyphs8($op, $src, $dst, $mask_format, $gsid,
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$src_x, $src_y,
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[$delta_x, $delta_y, $str], ...)
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$x->RenderCompositeGlyphs16($op, $src, $dst, $mask_format, $gsid,
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$src_x, $src_y,
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[$delta_x, $delta_y, $str], ...)
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$x->RenderCompositeGlyphs32($op, $src, $dst, $mask_format, $gsid,
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$src_x, $src_y,
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[$delta_x, $delta_y, $str], ...)
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</PRE>
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<P>
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In these three requests, new GlyphSetIDs can also be interspersed with
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the array references.
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<P>
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<PRE>
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$x->RenderCreateCursor($cid, $source, $hot_x, $hot_y)
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$x->RenderCreateAnimCursor($cid, [$cursor, $delay], ...)
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</PRE>
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<A NAME="lbAG"> </A>
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<H2>AUTHOR</H2>
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Stephen McCamant <<A HREF="mailto:SMCCAM@cpan.org">SMCCAM@cpan.org</A>>.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<I><A HREF="/cgi-bin/man/man2html?1+perl">perl</A></I>(1),
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X11::Protocol,
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<I>The X Rendering Extension (XFree86 draft standard)</I>.
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">SYMBOLIC CONSTANTS</A><DD>
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<DT id="5"><A HREF="#lbAF">REQUESTS</A><DD>
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<DT id="6"><A HREF="#lbAG">AUTHOR</A><DD>
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<DT id="7"><A HREF="#lbAH">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:00 GMT, March 31, 2021
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</BODY>
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</HTML>
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