NAME

       X11::Protocol::Ext::RENDER - Perl module for the X Rendering Extension

SYNOPSIS

         use X11::Protocol;
         $x = X11::Protocol->new($ENV{'DISPLAY'});
         $x->init_extension('RENDER') or die;

DESCRIPTION

       The RENDER extension adds a new set of drawing primitives which effectively represent a
       replacement of the drawing routines in the core protocol, redesigned based on the needs of
       more modern clients. It adds long-desired features such as subpixel positioning, alpha
       compositing, direct specification of colors, and multicolored or animated cursors. On the
       other hand, it omits features that are no longer commonly used: wide lines, arbitrary
       polygons (only triangles and horizontally-aligned trapezoids are supported), ellipses,
       bitwise rendering operations, and server-side fonts (in favor of "glyphs" that are
       rendered on the client side and transmitted once).

       As of this writing (early 2004), the specification and implementation both have rough
       edges, but there are relatively few alternatives for offloading fancy graphics processing
       to the server, as is necessary over slow links or if the client is written in a slow
       language. Another possibility you might consider is the 2D subset of OpenGL, though it
       doesn't yet have an X11::Protocol-compatible interface.

SYMBOLIC CONSTANTS

       This extension adds the constant types 'PictType', 'PictOp', 'SubPixel', 'PolyEdge', and
       'PolyMode', with values as defined in the standard.

REQUESTS

       This extension adds several requests, called as shown below:

         $x->RenderQueryVersion($major, $minor)
         =>
         ($major, $minor)

         $x->RenderQueryPictFormats()
         =>
         ([[$id, $type, $depth,
            $red, $red_m, $green, $green_m, $blue, $blue_m,
            $alpha, $alpha_m, $cmap], ...],
          [[$fallback, [$depth, [$visual, $format], ...], ...], ...],
          [$subpixel, ...])

         $x->RenderQueryPictIndexValues($pict_format)
         =>
         ([$index, $red, $green, $blue, $alpha], ...)

         $x->RenderQueryFilters($drawable)
         =>
         ([@filters], [@aliases])

         $x->RenderCreatePicture($picture, $drawable, $format,
                                 'attribute' => $value, ...)

         $x->RenderChangePicture($picture, 'attribute' => $value, ...)

         $x->RenderSetPictureClipRectangles($pic, $x_origin, $y_origin,
                                            [$x, $y, $width, $height], ...)

         $x->RenderSetPictureTransform($pict, $m11, $m12, $m13,
                                              $m21, $m22, $m23,
                                              $m31, $m32, $m33);

         $x->RenderSetPictureFilter($pict, $filter, @args)

         $x->RenderComposite($op, $src, $mask, $dst, $src_x, $src_y,
                             $mask_x, $mask_y, $dst_x, $dst_y,
                             $width, $height)

         $x->RenderFillRectangles($op, $dst, [$red, $green, $blue, $alpha],
                                  [$x, $y, $width, $height], ...)

         $x->RenderTrapezoids($op, $src, $src_x, $src_y, $dst, $mask_format,
                              [$top, $bottom, $lx1, $ly1, $lx2, $ly2,
                                              $rx1, $ry1, $rx2, $ry2] ,...)

         $x->RenderTriangles($op, $src, $src_x, $src_y, $dst, $mask_format,
                             [$x1, $y1, $x2, $y2, $x3, $y3])

         $x->RenderTriStrip($op, $src, $src_x, $src_y, $dst, $mask_format,
                             [$x, $y], [$x, $y], [$x, $y], [$x, $y], ...)

         $x->RenderTriFan($op, $src, $src_x, $src_y, $dst, $mask_format,
                          [$x, $y], [$x, $y], [$x, $y], [$x, $y], ...)

         $x->RenderCreateGlyphSet($gsid, $format)

         $x->RenderReferenceGlyphSet($gsid, $existing)

         $x->RenderFreeGlyphSet($gsid)

         $x->RenderAddGlyphs($gsid, [$glyph, $width, $height,
                                     $x, $y, $x_off, $y_off, $data], ...)

       Warning: with some server implementations (including XFree86 through 4.4) passing more
       than one glyph to AddGlyphs can hang or crash the server.  So don't do that.

         $x->RenderFreeGylphs($gsid, @glyphs)

         $x->RenderCompositeGlyphs8($op, $src, $dst, $mask_format, $gsid,
                                    $src_x, $src_y,
                                    [$delta_x, $delta_y, $str], ...)

         $x->RenderCompositeGlyphs16($op, $src, $dst, $mask_format, $gsid,
                                     $src_x, $src_y,
                                     [$delta_x, $delta_y, $str], ...)

         $x->RenderCompositeGlyphs32($op, $src, $dst, $mask_format, $gsid,
                                     $src_x, $src_y,
                                     [$delta_x, $delta_y, $str], ...)

       In these three requests, new GlyphSetIDs can also be interspersed with the array
       references.

         $x->RenderCreateCursor($cid, $source, $hot_x, $hot_y)

         $x->RenderCreateAnimCursor($cid, [$cursor, $delay], ...)

AUTHOR

       Stephen McCamant <SMCCAM@cpan.org>.

SEE ALSO

       perl(1), X11::Protocol, The X Rendering Extension (XFree86 draft standard).