added docs for glyphs

[sdlgit/SDL-Site.git] / pages / SDL-TTF.html-inc

<div class="pod">
<!-- INDEX START -->
<h3 id="TOP">Index</h3>

<ul><li><a href="#NAME">NAME</a></li>
<li><a href="#CATEGORY">CATEGORY</a></li>
<li><a href="#METHODS">METHODS</a>
<ul><li><a href="#General_methods">General methods</a>
<ul><li><a href="#linked_version">linked_version</a></li>
<li><a href="#compile_time_version">compile_time_version</a></li>
<li><a href="#init">init</a></li>
<li><a href="#was_init">was_init</a></li>
<li><a href="#quit">quit</a></li>
</ul>
</li>
<li><a href="#Management_functions">Management functions</a>
<ul><li><a href="#open_font">open_font</a></li>
<li><a href="#open_font_index">open_font_index</a></li>
<li><a href="#open_font_RW">open_font_RW</a></li>
<li><a href="#open_font_index_RW">open_font_index_RW</a></li>
</ul>
</li>
<li><a href="#Attributes">Attributes</a>
<ul><li><a href="#Global_attributes">Global attributes</a>
<ul><li><a href="#byte_swapped_unicode">byte_swapped_unicode</a></li>
</ul>
</li>
<li><a href="#Font_style">Font style</a>
<ul><li><a href="#get_font_style">get_font_style</a></li>
<li><a href="#set_font_style">set_font_style</a></li>
<li><a href="#get_font_outline">get_font_outline</a></li>
<li><a href="#set_font_outline">set_font_outline</a></li>
</ul>
</li>
<li><a href="#Font_settings">Font settings</a>
<ul><li><a href="#get_font_hinting">get_font_hinting</a></li>
<li><a href="#set_font_hinting">set_font_hinting</a></li>
<li><a href="#get_font_kerning">get_font_kerning</a></li>
<li><a href="#set_font_kerning">set_font_kerning</a></li>
</ul>
</li>
<li><a href="#Font_metrics">Font metrics</a>
<ul><li><a href="#font_height">font_height</a></li>
<li><a href="#font_ascent">font_ascent</a></li>
<li><a href="#font_descent">font_descent</a></li>
<li><a href="#font_line_skip">font_line_skip</a></li>
</ul>
</li>
<li><a href="#Face_attributes">Face attributes</a>
<ul><li><a href="#font_faces">font_faces</a></li>
<li><a href="#font_face_is_fixed_width">font_face_is_fixed_width</a></li>
<li><a href="#font_face_family_name">font_face_family_name</a></li>
<li><a href="#font_face_style_name">font_face_style_name</a></li>
</ul>
</li>
<li><a href="#Glyphs">Glyphs</a>
<ul><li><a href="#glyph_is_provided">glyph_is_provided</a></li>
<li><a href="#glyph_metrics">glyph_metrics</a></li>
</ul>
</li>
<li><a href="#Text_metrics">Text metrics</a>
<ul><li><a href="#size_text">size_text</a></li>
<li><a href="#size_utf8">size_utf8</a></li>
<li><a href="#size_unicode">size_unicode</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#Font_Rendering">Font Rendering</a>
<ul><li><a href="#render_glyph_solid">render_glyph_solid</a></li>
<li><a href="#render_glyph_shaded">render_glyph_shaded</a></li>
<li><a href="#render_glyph_blended">render_glyph_blended</a></li>
<li><a href="#render_text_solid">render_text_solid</a></li>
<li><a href="#render_text_shaded">render_text_shaded</a></li>
<li><a href="#render_text_blended">render_text_blended</a></li>
<li><a href="#render_utf8_solid">render_utf8_solid</a></li>
<li><a href="#render_utf8_shaded">render_utf8_shaded</a></li>
<li><a href="#render_utf8_blended">render_utf8_blended</a></li>
<li><a href="#render_unicode_solid">render_unicode_solid</a></li>
<li><a href="#render_unicode_shaded">render_unicode_shaded</a></li>
<li><a href="#render_unicode_blended">render_unicode_blended</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#AUTHOR">AUTHOR</a></li>
<li><a href="#SEE_ALSO">SEE ALSO</a>
</li>
</ul><hr />
<!-- INDEX END -->

<h1 id="NAME">NAME</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="NAME_CONTENT">
<p>SDL::TTF - True Type Font functions (libfreetype)</p>

</div>
<h1 id="CATEGORY">CATEGORY</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="CATEGORY_CONTENT">
<p>TODO, TTF</p>

</div>
<h1 id="METHODS">METHODS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="METHODS_CONTENT">

</div>
<h2 id="General_methods">General methods</h2>
<div id="General_methods_CONTENT">

</div>
<h3 id="linked_version">linked_version</h3>
<div id="linked_version_CONTENT">
<pre> my $version = SDL::TTF::linked_version();

</pre>
<p>This gives you the SDL::Version object which SDL_ttf lib is used on the system.
No prior initialization needs to be done before these function is called. </p>
<p>Example:</p>
<pre> use SDL::TTF;
 use SDL::Version;

 my $version = SDL::TTF::linked_version();

 printf(&quot;got version: %d.%d.%d\n&quot;, $version-&gt;major, $version-&gt;minor, $version-&gt;patch);

</pre>

</div>
<h3 id="compile_time_version">compile_time_version</h3>
<div id="compile_time_version_CONTENT">
<pre> my $version = SDL::TTF::compile_time_version();

</pre>
<p>This gives you the SDL::Version object which SDL_ttf was present at compile time.</p>

</div>
<h3 id="init">init</h3>
<div id="init_CONTENT">
<pre> my $success = SDL::TTF::init();

</pre>
<p>Initialize the truetype font API.
This must be called before using other functions in this library, except <a href="/SDL-TTF.html#was_init">SDL::TTF::was_init</a> and <a href="/SDL-TTF.html#linked_version">SDL::TTF::linked_version</a>.
SDL does not have to be initialized before this call.</p>
<p>Returns: <code>0</code> on success, <code>-1</code> on any error.</p>

</div>
<h3 id="was_init">was_init</h3>
<div id="was_init_CONTENT">
<pre> my $was_init = SDL::TTF::was_init();

</pre>
<p>Query the initilization status of the truetype font API.
You may, of course, use this before <a href="/SDL-TTF.html#init">SDL::TTF::init</a> to avoid initializing twice in a row. Or use this to determine if you need to call 
<a href="/SDL-TTF.html#quit">SDL::TTF::quit</a>.</p>

</div>
<h3 id="quit">quit</h3>
<div id="quit_CONTENT">
<pre> SDL::TTF::quit();

</pre>
<p>Shutdown and cleanup the truetype font API.
After calling this the SDL::TTF functions should not be used, excepting <a href="/SDL-TTF.html#was_init">SDL::TTF::was_init</a>. You may, of course, use <a href="/SDL-TTF.html#init">SDL::TTF::init</a> to 
use the functionality again</p>

</div>
<h2 id="Management_functions">Management functions</h2>
<div id="Management_functions_CONTENT">

</div>
<h3 id="open_font">open_font</h3>
<div id="open_font_CONTENT">
<pre> my $font = SDL::TTF::open_font($font_file, $point_size);

</pre>
<p>Load file for use as a font, at the given size. This is actually <code>SDL::TTF::open_font_index(..., ..., $index = 0)</code>. This can load TTF and FON files.</p>
<p>Returns: a <a href="SDL-TTF-Font.html">SDL::TTF::Font</a> object. <code>undef</code> is returned on errors.</p>
<p>Example:</p>
<pre> use SDL::TTF;
 use SDL::TTF::Font;

 my $font = SDL::TTF::open_font('arial.ttf', '24);

</pre>

</div>
<h3 id="open_font_index">open_font_index</h3>
<div id="open_font_index_CONTENT">
<pre> my $font = SDL::TTF::open_font($font_file, $point_size, $face_index);

</pre>
<p>This is the same as <a href="/SDL-TTF.html#open_font">SDL::TTF::open_font</a>, except you can specify the face index of a font file containing multiple faces. 
This can load TTF and FON files. </p>

</div>
<h3 id="open_font_RW">open_font_RW</h3>
<div id="open_font_RW_CONTENT">
<pre> my $font = SDL::TTF::open_font_RW($rwops_object, $free, $point_size);

</pre>
<p>This is the same as <a href="/SDL-TTF.html#open_font">SDL::TTF::open_font</a>, except you can pass an <a href="SDL-RWOps.html">SDL::RWOps</a>-object. If you pass true as <code>$free</code>, the <a href="SDL-RWOps.html">SDL::RWOps</a>-object
will be freed by SDL_ttf library. Don't do this, perl will free this object for you.</p>
<p>Example:</p>
<pre> my $font = SDL::TTF::open_font_RW(SDL::RWOps-&gt;new_file($font_file, 'r'), 0, 24);

</pre>

</div>
<h3 id="open_font_index_RW">open_font_index_RW</h3>
<div id="open_font_index_RW_CONTENT">
<pre> my $font = SDL::TTF::open_font_index_RW($rwops_object, $free, $point_size, $face_index);

</pre>
<p>This is the same as <a href="/SDL-TTF.html#open_font_index">SDL::TTF::open_font_index</a>, except you can pass an <a href="SDL-RWOps.html">SDL::RWOps</a>-object. If you pass true as <code>$free</code>, the 
<a href="SDL-RWOps.html">SDL::RWOps</a>-object will be freed by SDL_ttf library. Don't do this, perl will free this object for you.</p>

</div>
<h2 id="Attributes">Attributes</h2>
<div id="Attributes_CONTENT">

</div>
<h3 id="Global_attributes">Global attributes</h3>
<div id="Global_attributes_CONTENT">

</div>
<h4 id="byte_swapped_unicode">byte_swapped_unicode</h4>
<div id="byte_swapped_unicode_CONTENT">
<pre> SDL::TTF::byte_swapped_unicode( $bool );

</pre>
<p>This function tells SDL_ttf whether UNICODE (2 bytes per character) text is generally byteswapped. A <code>UNICODE_BOM_NATIVE</code> or 
<code>UNICODE_BOM_SWAPPED</code> character in a string will temporarily override this setting for the remainder of that string, however this setting 
will be restored for the next one. The default mode is non-swapped, native endianness of the CPU.</p>

</div>
<h3 id="Font_style">Font style</h3>
<div id="Font_style_CONTENT">

</div>
<h4 id="get_font_style">get_font_style</h4>
<div id="get_font_style_CONTENT">
<pre> SDL::TTF::get_font_style($font);

</pre>
<p>Returns: The style as a bitmask composed of the following masks:</p>
<ul>
		<li>TTF_STYLE_NORMAL	</li>
		<li>TTF_STYLE_BOLD	</li>
		<li>TTF_STYLE_ITALIC	</li>
		<li>TTF_STYLE_UNDERLINE	</li>
		<li>TTF_STYLE_STRIKETHROUGH (since SDL_ttf 2.0.10)</li>
</ul>

<p>Example:</p>
<pre> my $style = SDL::TTF::get_font_style($font);

 print(&quot;normal\n&quot;)        if $style == TTF_STYLE_NORMAL;
 print(&quot;bold\n&quot;)          if $style  &amp; TTF_STYLE_BOLD;
 print(&quot;italic\n&quot;)        if $style  &amp; TTF_STYLE_ITALIC;
 print(&quot;underline\n&quot;)     if $style  &amp; TTF_STYLE_UNDERLINE;
 print(&quot;strikethrough\n&quot;) if $style  &amp; TTF_STYLE_STRIKETHROUGH;

</pre>

</div>
<h4 id="set_font_style">set_font_style</h4>
<div id="set_font_style_CONTENT">
<pre> SDL::TTF::set_font_style($font, $style);

</pre>
<p>Set the rendering style of the loaded font.</p>
<p><strong>Note</strong>: <code>TTF_STYLE_UNDERLINE</code> may cause surfaces created by <code>SDL::TTF::render_glyph_*</code> functions to be extended vertically, downward only, 
to encompass the underline if the original glyph metrics didn't allow for the underline to be drawn below. This does not change the math used 
to place a glyph using glyph metrics.
On the other hand <code>TTF_STYLE_STRIKETHROUGH</code> doesn't extend the glyph, since this would invalidate the metrics used to position the glyph when 
blitting, because they would likely be extended vertically upward. There is perhaps a workaround, but it would require programs to be smarter 
about glyph blitting math than they are currently designed for.
Still, sometimes the underline or strikethrough may be outside of the generated surface, and thus not visible when blitted to the screen. In 
this case, you should probably turn off these styles and draw your own strikethroughs and underlines. </p>

</div>
<h4 id="get_font_outline">get_font_outline</h4>
<div id="get_font_outline_CONTENT">
<pre> my $outline = SDL::TTF::get_font_outline($font);

</pre>
<p>Get the current outline width of the font, in pixels.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>

</div>
<h4 id="set_font_outline">set_font_outline</h4>
<div id="set_font_outline_CONTENT">
<pre> SDL::TTF::get_font_outline($font, $outline);

</pre>
<p>Set the outline pixel width of the loaded font. Use <code>0</code>(zero) to turn off outlining.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>

</div>
<h3 id="Font_settings">Font settings</h3>
<div id="Font_settings_CONTENT">

</div>
<h4 id="get_font_hinting">get_font_hinting</h4>
<div id="get_font_hinting_CONTENT">
<pre> my $hinting = SDL::TTF::get_font_hinting($font);

</pre>
<p>Get the current hinting setting of the loaded font.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>
<p>Returns the hinting type matching one of the following defined values:</p>
<ul>
		<li>TTF_HINTING_NORMAL	</li>
		<li>TTF_HINTING_LIGHT	</li>
		<li>TTF_HINTING_MONO	</li>
		<li>TTF_HINTING_NONE</li>
</ul>


</div>
<h4 id="set_font_hinting">set_font_hinting</h4>
<div id="set_font_hinting_CONTENT">
<pre> SDL::TTF::set_font_hinting($font, $hinting);

</pre>
<p>Set the hinting of the loaded font. You should experiment with this setting if you know which font you are using beforehand, especially when 
using smaller sized fonts. If the user is selecting a font, you may wish to let them select the hinting mode for that font as well.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>
<p>Example:</p>
<pre> SDL::TTF::set_font_hinting($font, TTF_HINTING_LIGHT);

</pre>

</div>
<h4 id="get_font_kerning">get_font_kerning</h4>
<div id="get_font_kerning_CONTENT">
<pre> my $kerning_enabled = SDL::TTF::get_font_kerning($font);

</pre>
<p>Get the current kerning setting of the loaded font.</p>
<p>Returns: <code>0</code>(zero) if kerning is disabled. A non-zero value is returned when enabled. The default for a newly loaded font is enabled(<code>1</code>). </p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>

</div>
<h4 id="set_font_kerning">set_font_kerning</h4>
<div id="set_font_kerning_CONTENT">
<pre> SDL::TTF::set_font_kerning($font, $kerning_enabled);

</pre>
<p>Set whether to use kerning when rendering the loaded font. This has no effect on individual glyphs, but rather when rendering whole strings of 
characters, at least a word at a time. Perhaps the only time to disable this is when kerning is not working for a specific font, resulting in 
overlapping glyphs or abnormal spacing within words.</p>
<p>Pass <code>0</code> to disable kerning, 1 to enable.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>

</div>
<h3 id="Font_metrics">Font metrics</h3>
<div id="Font_metrics_CONTENT">

</div>
<h4 id="font_height">font_height</h4>
<div id="font_height_CONTENT">
<pre> my $font_height = SDL::TTF::font_height($font);

</pre>
<p>Get the maximum pixel height of all glyphs of the loaded font. You may use this height for rendering text as close together vertically as 
possible, though adding at least one pixel height to it will space it so they can't touch. Remember that SDL_ttf doesn't handle multiline 
printing, so you are responsible for line spacing, see the <a href="/SDL-TTF.html#font_line_skip">SDL::TTF::font_line_skip</a> as well.</p>

</div>
<h4 id="font_ascent">font_ascent</h4>
<div id="font_ascent_CONTENT">
<pre> my $font_ascent = SDL::TTF::font_ascent($font);

</pre>
<p>Get the maximum pixel ascent of all glyphs of the loaded font. This can also be interpreted as the distance from the top of the font to the 
baseline.
It could be used when drawing an individual glyph relative to a top point, by combining it with the glyph's <code>maxy</code> metric to resolve the top 
of the rectangle used when blitting the glyph on the screen.</p>
<p>Example:</p>
<pre> my ($minx, $maxx, $miny, $maxy, $advance) = @{ SDL::TTF::glyph_metrics($font, &quot;\0M&quot;) };

 $rect-&gt;y( $top + SDL::TTF::font_ascent($font) - $maxy );

</pre>

</div>
<h4 id="font_descent">font_descent</h4>
<div id="font_descent_CONTENT">
<pre> my $font_descent = SDL::TTF::font_descent($font);

</pre>
<p>Get the maximum pixel descent of all glyphs of the loaded font. This can also be interpreted as the distance from the baseline to the bottom of 
the font.
It could be used when drawing an individual glyph relative to a bottom point, by combining it with the glyph's <code>maxy</code> metric to resolve the top 
of the rectangle used when blitting the glyph on the screen.</p>
<p>Example:</p>
<pre> my ($minx, $maxx, $miny, $maxy, $advance) = @{ SDL::TTF::glyph_metrics($font, &quot;\0M&quot;) };

 $rect-&gt;y( $bottom - SDL::TTF::font_descent($font) - $maxy );

</pre>

</div>
<h4 id="font_line_skip">font_line_skip</h4>
<div id="font_line_skip_CONTENT">
<pre> my $font_line_skip = SDL::TTF::font_line_skip($font);

</pre>
<p>Get the recommended pixel height of a rendered line of text of the loaded font. This is usually larger than the <a href="/SDL-TTF.html#font_height">SDL::TTF::font_height</a> of the 
font.</p>

</div>
<h3 id="Face_attributes">Face attributes</h3>
<div id="Face_attributes_CONTENT">

</div>
<h4 id="font_faces">font_faces</h4>
<div id="font_faces_CONTENT">
<pre> my $font_faces = SDL::TTF::font_faces($font);

</pre>
<p>Get the number of faces (&quot;sub-fonts&quot;) available in the loaded font. This is a count of the number of specific fonts (based on size and style 
and other typographical features perhaps) contained in the font itself.</p>

</div>
<h4 id="font_face_is_fixed_width">font_face_is_fixed_width</h4>
<div id="font_face_is_fixed_width_CONTENT">
<pre> my $font_face_is_fixed_width = SDL::TTF::font_face_is_fixed_width($font);

</pre>
<p>Test if the current font face of the loaded font is a fixed width font. Fixed width fonts are monospace, meaning every character that exists 
in the font is the same width, thus you can assume that a rendered string's width is going to be the result of <code>glyph_width * string_length</code>.</p>
<p>Returns: <code>&gt;0</code> if font is a fixed width font. <code>0</code> if not a fixed width font. </p>

</div>
<h4 id="font_face_family_name">font_face_family_name</h4>
<div id="font_face_family_name_CONTENT">
<pre> my $font_face_family_name = SDL::TTF::font_face_family_name($font);

</pre>
<p>Get the current font face family name from the loaded font. This information is not for every font available.</p>
<p>Example:</p>
<pre> my $font = SDL::TTF::open_font('arialuni.ttf', 8);

 printf(&quot;%s\n&quot;, SDL::TTF::font_face_family_name($font)); # will print &quot;Arial Unicode MS&quot;

</pre>

</div>
<h4 id="font_face_style_name">font_face_style_name</h4>
<div id="font_face_style_name_CONTENT">
<pre> my $font_face_style_name = SDL::TTF::font_face_style_name($font);

</pre>
<p>Get the current font face style name from the loaded font. This information is not for every font available. </p>
<p>Example:</p>
<pre> my $font = SDL::TTF::open_font('arialuni.ttf', 8);

 printf(&quot;%s\n&quot;, SDL::TTF::font_face_style_name($font)); # will print &quot;Regular&quot;

</pre>

</div>
<h3 id="Glyphs">Glyphs</h3>
<div id="Glyphs_CONTENT">

</div>
<h4 id="glyph_is_provided">glyph_is_provided</h4>
<div id="glyph_is_provided_CONTENT">
<pre> my $glyph_is_provided = SDL::TTF::glyph_is_provided($font, $unicode_char);

</pre>
<p>Get the status of the availability of the glyph from the loaded font.</p>
<p>Returns: the index of the glyph in font, or 0 for an undefined character code.</p>
<p><strong>Note</strong>: You have to pass this unicode character either as UTF16/UCS-2 big endian without BOM, or with BOM as UTF16/UCS-2 big/little endian.</p>
<p><strong>Note</strong>: at least SDL_ttf 2.0.10 needed</p>
<p>Example:</p>
<pre> print(&quot;We have this char!\n&quot;) if SDL::TTF::glyph_is_provided($font, &quot;\0M&quot;);

</pre>

</div>
<h4 id="glyph_metrics">glyph_metrics</h4>
<div id="glyph_metrics_CONTENT">
<pre> my @glyph_metrics = @{ SDL::TTF::glyph_metrics($font, $unicode_char) };

</pre>
<p>Get desired glyph metrics of the UNICODE char from the loaded font.</p>
<p>See also: <a href="http://freetype.sourceforge.net/freetype2/docs/tutorial/step2.html">The FreeType2 Documentation Tutorial</a></p>
<p><strong>Note</strong>: You have to pass this unicode character either as UTF16/UCS-2 big endian without BOM, or with BOM as UTF16/UCS-2 big/little endian.</p>
<p>Example:</p>
<pre> my ($minx, $maxx, $miny, $maxy, $advance) = @{ SDL::TTF::glyph_metrics($font, &quot;\0M&quot;) };

</pre>

</div>
<h3 id="Text_metrics">Text metrics</h3>
<div id="Text_metrics_CONTENT">

</div>
<h4 id="size_text">size_text</h4>
<div id="size_text_CONTENT">
<pre> my ($width, $height) = @{ SDL::TTF::size_text($font, 'Hallo World!') };

</pre>

</div>
<h4 id="size_utf8">size_utf8</h4>
<div id="size_utf8_CONTENT">
<pre> my ($width, $height) = @{ SDL::TTF::size_utf8($font, 'Hallo World!') };

</pre>

</div>
<h4 id="size_unicode">size_unicode</h4>
<div id="size_unicode_CONTENT">
<pre> my ($width, $height) = @{ SDL::TTF::size_unicode($font, 'Hallo World!') };

</pre>

</div>
<h2 id="Font_Rendering">Font Rendering</h2>
<div id="Font_Rendering_CONTENT">

</div>
<h3 id="render_glyph_solid">render_glyph_solid</h3>
<div id="render_glyph_solid_CONTENT">

</div>
<h3 id="render_glyph_shaded">render_glyph_shaded</h3>
<div id="render_glyph_shaded_CONTENT">

</div>
<h3 id="render_glyph_blended">render_glyph_blended</h3>
<div id="render_glyph_blended_CONTENT">

</div>
<h3 id="render_text_solid">render_text_solid</h3>
<div id="render_text_solid_CONTENT">
<p><strong>Note</strong>: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=374062</p>

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<h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p>
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<p>Tobias Leich [FROGGS]</p>

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<h1 id="SEE_ALSO">SEE ALSO</h1><p><a href="#TOP" class="toplink">Top</a></p>
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<p><a href="SDL-TTF-Font.html">SDL::TTF::Font</a>, <a href="http://search.cpan.org/perldoc?Unicode::String">Unicode::String</a>, <a href="SDL-Video.html">SDL::Video</a>, <a href="SDL-Surface.html">SDL::Surface</a></p>

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