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

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<!-- 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="#SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#CONSTANTS">CONSTANTS</a></li>
<li><a href="#METHODS">METHODS</a>
<ul><li><a href="#new">new</a></li>
<li><a href="#new_from">new_from</a></li>
<li><a href="#w">w</a></li>
<li><a href="#h">h</a></li>
<li><a href="#format">format</a></li>
<li><a href="#pitch">pitch</a></li>
</ul>
</li>
<li><a href="#Direct_Write_to_Surface_Pixel">Direct Write to Surface Pixel</a>
<ul><li><a href="#get_pixel">get_pixel</a></li>
<li><a href="#set_pixels">set_pixels</a></li>
<li><a href="#get_pixels_ptr">get_pixels_ptr</a></li>
</ul>
</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::Surface - Graphic surface structure</p>

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<h1 id="CATEGORY">CATEGORY</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="CATEGORY_CONTENT">
<p>Core, Video, Structure</p>

</div>
<h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SYNOPSIS_CONTENT">
<pre> use SDL;
 use SDL::Video;
 use SDL::Surface;

 # Create the main surface (display)
 SDL::init(SDL_INIT_VIDEO);
 my $display = SDL::Video::set_video_mode(640, 480, 16, SDL_SWSURFACE);

 # Create other surfaces attached to the $display.
 my $surface  = SDL::Surface-&gt;new(SDL_ASYNCBLIT | SDL_HWSURFACE, 640, 480, 16, 0, 0, 0, 0);
 my $surface2 = SDL::Surface-&gt;new_from($surface, 100, 100, 8, 0, 0, 0, 0);

</pre>

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<h1 id="DESCRIPTION">DESCRIPTION</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="DESCRIPTION_CONTENT">
<p>An <code>SDL_Surface</code> defines a surfaceangular area of pixels.</p>

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<h1 id="CONSTANTS">CONSTANTS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="CONSTANTS_CONTENT">
<p>The constants for SDL::Surface belong to SDL::Video, under the export tag of <code>':surface'</code>.</p>
<dl>
	<dt>SDL_ASYNCBLIT</dt>
	<dd>
		<p>Use asynchronous blit if possible</p>
	</dd>
	<dt>SDL_SWSURFACE</dt>
	<dd>
		<p>Store in system memory</p>
	</dd>
	<dt>SDL_HWSURFACE</dt>
	<dd>
		<p>Store in video memory</p>
	</dd>
</dl>

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

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<h2 id="new">new</h2>
<div id="new_CONTENT">
<pre> my $surface = SDL::Surface-&gt;new(
     $flags, $width, $height, $depth, $Rmask, $Gmask, $Bmask, $Amask
 );

</pre>
<p>The constructor creates a new surface with the specified parameter values.</p>
<p>The four mask values are the bits that the channel will ignore.
For example, an Rmask of <code>0xFF</code> will ignore that channel completely, making everything on the surface more green/blue.</p>

</div>
<h2 id="new_from">new_from</h2>
<div id="new_from_CONTENT">
<pre> my $surface = SDL::Surface-&gt;new_from(
     $surface, $width, $height, $depth, $Rmask, $Gmask, $Bmask, $Amask
 );

</pre>
<p>The constructor creates a new surface with the specified parameter values.
The flags are taken from the specified <code>$surface</code>.</p>

</div>
<h2 id="w">w</h2>
<div id="w_CONTENT">
<pre> my $w = $surface-&gt;w;

</pre>
<p>Returns the width of the surface.
SDL::Surface width is defined at construction so this is read-only.</p>

</div>
<h2 id="h">h</h2>
<div id="h_CONTENT">
<pre> my $h = $surface-&gt;h;

</pre>
<p>Returns the height of the surface.
SDL::Surface height is defined at construction so this is read-only.</p>

</div>
<h2 id="format">format</h2>
<div id="format_CONTENT">
<pre> my $format = $surface-&gt;format;

</pre>
<p>The format of the pixels stored in the surface.
See <a href="SDL-PixelFormat.html">SDL::PixelFormat</a></p>

</div>
<h2 id="pitch">pitch</h2>
<div id="pitch_CONTENT">
<pre> my $pitch = $surface-&gt;pitch;

</pre>
<p>The scanline length in bytes.</p>

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<h1 id="Direct_Write_to_Surface_Pixel">Direct Write to Surface Pixel</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="Direct_Write_to_Surface_Pixel_CONTEN">
<p><strong>Disclaimer:</strong> The following methods can be very slow, making them suitable for creating surfaces, but not for animations</p>

</div>
<h2 id="get_pixel">get_pixel</h2>
<div id="get_pixel_CONTENT">
<pre> my $pixel = $surface-&gt;get_pixel( $offset )

</pre>
<p>Returns the pixel value for the given <code>$offset</code>.
The pixel value depends on current pixel format.</p>
<p><strong>Note:</strong> For surfaces with a palette (1 byte per pixel) the palette index is returned instead of color values.</p>

</div>
<h2 id="set_pixels">set_pixels</h2>
<div id="set_pixels_CONTENT">
<pre> $surface-&gt;set_pixels( $offset, $value );

</pre>
<p>Sets the pixel <code>$value</code> to the given <code>$offset</code>.
The pixel value must fit the pixel format of the surface.</p>
<p><strong>Note</strong>: For surfaces with a palette (1 byte per pixel) the palette index must be passed instead of color values.</p>
<p>Example:</p>
<pre> sub putpixel {
     my ($x, $y, $color) = @_;
     $display-&gt;set_pixels( $x + $y * $display-&gt;w, $color);
 }

</pre>
<p>See also <cite>examples/pixel_operations/sols/ch02.pl</cite>!</p>

</div>
<h2 id="get_pixels_ptr">get_pixels_ptr</h2>
<div id="get_pixels_ptr_CONTENT">
<pre> my $ptr = $surface-&gt;get_pixels_ptr;

</pre>
<p>Returns a reference to the surface's pixels.</p>

</div>
<h1 id="SEE_ALSO">SEE ALSO</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SEE_ALSO_CONTENT">
<p><a href="SDL.html">SDL</a>, <a href="SDL-PixelFormat.html">SDL::PixelFormat</a>, <a href="SDL-Video.html">SDL::Video</a>, <a href="SDL-Rect.html">SDL::Rect</a></p>

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