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<span id="Surfaces"></span><div class="header">
<p>
Next: <a href="Rendering.html" accesskey="n" rel="next">Rendering</a>, Previous: <a href="Rects.html" accesskey="p" rel="prev">Rects</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Surfaces-1"></span><h3 class="section">3.6 Surfaces</h3>
<div class="example">
<pre class="example">(use-modules (sdl2 surface))
</pre></div>
<dl>
<dt id="index-color_003f">Procedure: <strong>color?</strong> <em>c</em></dt>
<dd><p>Return <code>#t</code> if <var>c</var> is a color.
</p></dd></dl>
<dl>
<dt id="index-color_002dr">Procedure: <strong>color-r</strong> <em>c</em></dt>
</dl>
<dl>
<dt id="index-color_002dg">Procedure: <strong>color-g</strong> <em>c</em></dt>
</dl>
<dl>
<dt id="index-color_002db">Procedure: <strong>color-b</strong> <em>c</em></dt>
</dl>
<dl>
<dt id="index-color_002da">Procedure: <strong>color-a</strong> <em>c</em></dt>
</dl>
<dl>
<dt id="index-palette_003f">Procedure: <strong>palette?</strong> <em>p</em></dt>
<dd><p>Return <code>#t</code> if <var>p</var> is a palette.
</p></dd></dl>
<dl>
<dt id="index-palette_002dlength">Procedure: <strong>palette-length</strong> <em>palette</em></dt>
<dd><p>Return the number of colors in <var>palette</var>.
</p></dd></dl>
<dl>
<dt id="index-palette_002dcolors">Procedure: <strong>palette-colors</strong> <em>palette</em></dt>
<dd><p>Return the colors in <var>palette</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_003f">Procedure: <strong>pixel-format?</strong> <em>pf</em></dt>
<dd><p>Return <code>#t</code> if <var>pf</var> is a pixel format.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dname">Procedure: <strong>pixel-format-name</strong> <em>pf</em></dt>
<dd><p>Return the symbolic name of the pixel format <var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dpalette">Procedure: <strong>pixel-format-palette</strong> <em>pf</em></dt>
<dd><p>Return the palette for the pixel format <var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dbits_002dper_002dpixel">Procedure: <strong>pixel-format-bits-per-pixel</strong> <em>pf</em></dt>
<dd><p>Return the number of bits per pixel for the pixel format <var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dbytes_002dper_002dpixel">Procedure: <strong>pixel-format-bytes-per-pixel</strong> <em>pf</em></dt>
<dd><p>Return the number of bytes per pixel for the pixel format <var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dred_002dmask">Procedure: <strong>pixel-format-red-mask</strong> <em>pf</em></dt>
<dd><p>Return the bitmask for the red component of a pixel in the pixel format
<var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dgreen_002dmask">Procedure: <strong>pixel-format-green-mask</strong> <em>pf</em></dt>
<dd><p>Return the bitmask for the green component of a pixel in the pixel format
<var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dblue_002dmask">Procedure: <strong>pixel-format-blue-mask</strong> <em>pf</em></dt>
<dd><p>Return the bitmask for the blue component of a pixel in the pixel format
<var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-pixel_002dformat_002dalpha_002dmask">Procedure: <strong>pixel-format-alpha-mask</strong> <em>pf</em></dt>
<dd><p>Return the bitmask for the alpha component of a pixel in the pixel format
<var>pf</var>.
</p></dd></dl>
<dl>
<dt id="index-make_002drgb_002dsurface">Procedure: <strong>make-rgb-surface</strong> <em>width height depth</em></dt>
<dd><p>Create a new SDL surface with the dimensions <var>width</var> and <var>height</var> and
<var>depth</var> bits per pixel.
</p></dd></dl>
<dl>
<dt id="index-bytevector_002d_003esurface">Procedure: <strong>bytevector->surface</strong> <em>bv width height depth pitch</em></dt>
<dd><p>Convert <var>bv</var>, a bytevector of pixel data with dimensions
<var>width</var>x<var>height</var>, to an SDL surface. Each pixel is <var>depth</var> bits in
size, and each row of pixels is <var>pitch</var> bytes in size.
</p></dd></dl>
<dl>
<dt id="index-delete_002dsurface_0021">Procedure: <strong>delete-surface!</strong> <em>surface</em></dt>
<dd><p>Free the memory used by <var>surface</var>.
</p></dd></dl>
<dl>
<dt id="index-call_002dwith_002dsurface">Procedure: <strong>call-with-surface</strong> <em>surface proc</em></dt>
<dd><p>Call <var>proc</var>, passing it <var>surface</var> and deleting <var>surface</var> upon exit
of <var>proc</var>.
</p></dd></dl>
<dl>
<dt id="index-load_002dbmp">Procedure: <strong>load-bmp</strong> <em>file</em></dt>
<dd><p>Create a new surface from the bitmap data in <var>file</var>.
</p></dd></dl>
<dl>
<dt id="index-surface_002dwidth">Procedure: <strong>surface-width</strong> <em>surface</em></dt>
<dd><p>Return the width of <var>surface</var> in pixels.
</p></dd></dl>
<dl>
<dt id="index-surface_002dheight">Procedure: <strong>surface-height</strong> <em>surface</em></dt>
<dd><p>Return the height of <var>surface</var> in pixels.
</p></dd></dl>
<dl>
<dt id="index-surface_002dpitch">Procedure: <strong>surface-pitch</strong> <em>surface</em></dt>
<dd><p>Return the length of a row of pixels in <var>surface</var> in bytes.
</p></dd></dl>
<dl>
<dt id="index-surface_002dpixels">Procedure: <strong>surface-pixels</strong> <em>surface</em></dt>
<dd><p>Return a bytevector containing the raw pixel data in <var>surface</var>.
</p></dd></dl>
<dl>
<dt id="index-surface_002dpixel_002dformat">Procedure: <strong>surface-pixel-format</strong> <em>surface</em></dt>
<dd><p>Return the pixel format for <var>surface</var>.
</p></dd></dl>
<dl>
<dt id="index-convert_002dsurface_002dformat">Procedure: <strong>convert-surface-format</strong> <em>surface format</em></dt>
<dd><p>Convert the pixels in <var>surface</var> to <var>format</var>, a symbol representing a
specific pixel format, and return a new surface object.
</p>
<p>Valid format types are:
</p>
<ul>
<li> <code>index1lsb</code>
</li><li> <code>index1msb</code>
</li><li> <code>index4lsb</code>
</li><li> <code>index4msb</code>
</li><li> <code>index8</code>
</li><li> <code>rgb332</code>
</li><li> <code>rgb444</code>
</li><li> <code>rgb555</code>
</li><li> <code>bgr555</code>
</li><li> <code>argb4444</code>
</li><li> <code>rgba4444</code>
</li><li> <code>abgr4444</code>
</li><li> <code>bgra4444</code>
</li><li> <code>argb1555</code>
</li><li> <code>rgba5551</code>
</li><li> <code>abgr1555</code>
</li><li> <code>bgra5551</code>
</li><li> <code>rgb565</code>
</li><li> <code>bgr565</code>
</li><li> <code>rgb24</code>
</li><li> <code>bgr24</code>
</li><li> <code>rgb888</code>
</li><li> <code>rgbx8888</code>
</li><li> <code>bgr888</code>
</li><li> <code>bgrx8888</code>
</li><li> <code>argb8888</code>
</li><li> <code>rgba8888</code>
</li><li> <code>abgr8888</code>
</li><li> <code>bgra8888</code>
</li><li> <code>argb2101010</code>
</li><li> <code>yv12</code>
</li><li> <code>iyuv</code>
</li><li> <code>yuy2</code>
</li><li> <code>uyvy</code>
</li><li> <code>yvyu</code>
</li></ul>
</dd></dl>
<dl>
<dt id="index-blit_002dsurface">Procedure: <strong>blit-surface</strong> <em><var>src</var> <var>src-rect</var> <var>dst</var> <var>dst-rect</var></em></dt>
<dd><p>Blit the rectangle <var>src-rect</var> from the surface <var>src</var> to
<var>dst-rect</var> of the surface <var>dst</var>.
</p></dd></dl>
<dl>
<dt id="index-blit_002dscaled">Procedure: <strong>blit-scaled</strong> <em><var>src</var> <var>src-rect</var> <var>dst</var> <var>dst-rect</var></em></dt>
<dd><p>Blit the rectangle <var>src-rect</var> from the surface <var>src</var> to
<var>dst-rect</var> of the surface <var>dst</var>, scaling the source to fit the
destination.
</p></dd></dl>
<dl>
<dt id="index-fill_002drect">Procedure: <strong>fill-rect</strong> <em><var>dst</var> <var>rect</var> <var>color</var></em></dt>
<dd><p>Fill <var>rect</var> with <var>color</var>, a 32-bit color encoded as an integer
value, in the surface <var>dst</var>.
</p></dd></dl>
<hr>
<div class="header">
<p>
Next: <a href="Rendering.html" accesskey="n" rel="next">Rendering</a>, Previous: <a href="Rects.html" accesskey="p" rel="prev">Rects</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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