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<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
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<TITLE>Enscript Output</TITLE>
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<H1>../operations/common/brightness-contrast.c</H1>

<PRE>
<I><FONT COLOR="#B22222">/* This file is an image processing operation for GEGL
 *
 * GEGL is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * GEGL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GEGL; if not, see &lt;http://www.gnu.org/licenses/&gt;.
 *
 * Copyright 2006 Øyvind Kolås &lt;pippin@gimp.org&gt;
 */</FONT></I>

#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F">&quot;config.h&quot;</FONT></B>
#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F">&lt;glib/gi18n-lib.h&gt;</FONT></B>

#<B><FONT COLOR="#5F9EA0">ifdef</FONT></B> <FONT COLOR="#B8860B">GEGL_PROPERTIES</FONT>

<I><FONT COLOR="#B22222">/*  Here in the top of the file the properties of the operation is declared,
 *  this causes the declaration of a structure for containing the data.
 *
 *  The first member of each property_ macro becomes a struct member
 *  in the GeglProperties struct used when processing.
 */</FONT></I>

<B><FONT COLOR="#0000FF">property_double</FONT></B> (contrast, _(<B><FONT COLOR="#BC8F8F">&quot;Contrast&quot;</FONT></B>),  1.0)
   description  (_(<B><FONT COLOR="#BC8F8F">&quot;Magnitude of contrast scaling &gt;1.0 brighten &lt; 1.0 darken&quot;</FONT></B>))
   value_range  (-5.0, 5.0)
   ui_range     (0.0, 2.0)

<B><FONT COLOR="#0000FF">property_double</FONT></B> (brightness, _(<B><FONT COLOR="#BC8F8F">&quot;Brightness&quot;</FONT></B>), 0.0)
   description  (_(<B><FONT COLOR="#BC8F8F">&quot;Amount to increase brightness&quot;</FONT></B>))
   value_range  (-3.0, 3.0)
   ui_range     (-1.0, 1.0)

#<B><FONT COLOR="#5F9EA0">else</FONT></B>

<I><FONT COLOR="#B22222">/* Specify the base class we're building our operation on, the base
 * class provides a lot of the legwork so we do not have to. For
 * brightness contrast the best base class is the POINT_FILTER base
 * class.
 */</FONT></I>

#<B><FONT COLOR="#5F9EA0">define</FONT></B> <FONT COLOR="#B8860B">GEGL_OP_POINT_FILTER</FONT>

<I><FONT COLOR="#B22222">/* The C prefix used for some generated functions
 */</FONT></I>
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <FONT COLOR="#B8860B">GEGL_OP_NAME</FONT>     brightness_contrast

<I><FONT COLOR="#B22222">/* We specify the file we're in, this is needed to make the code
 * generation for the properties work.
 */</FONT></I>
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <FONT COLOR="#B8860B">GEGL_OP_C_SOURCE</FONT> brightness-contrast.c

<I><FONT COLOR="#B22222">/* Including gegl-op.h creates most of the GObject boiler plate
 * needed, creating a GeglOp instance structure a GeglOpClass
 * structure for our operation, as well as the needed code to register
 * our new gobject with GEGL.
 */</FONT></I>
#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F">&quot;gegl-op.h&quot;</FONT></B>

<I><FONT COLOR="#B22222">/* prepare() is called on each operation providing data to a node that
 * is requested to provide a rendered result. When prepare is called
 * all properties are known. For brightness contrast we use this
 * opportunity to dictate the formats of the input and output buffers.
 */</FONT></I>
<B><FONT COLOR="#228B22">static</FONT></B> <B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">prepare</FONT></B> (GeglOperation *operation)
{
  gegl_operation_set_format (operation, <B><FONT COLOR="#BC8F8F">&quot;input&quot;</FONT></B>, babl_format (<B><FONT COLOR="#BC8F8F">&quot;RGBA float&quot;</FONT></B>));
  gegl_operation_set_format (operation, <B><FONT COLOR="#BC8F8F">&quot;output&quot;</FONT></B>, babl_format (<B><FONT COLOR="#BC8F8F">&quot;RGBA float&quot;</FONT></B>));
}

<I><FONT COLOR="#B22222">/* For GeglOperationPointFilter subclasses, we operate on linear
 * buffers with a pixel count.
 */</FONT></I>
<B><FONT COLOR="#228B22">static</FONT></B> gboolean
<B><FONT COLOR="#0000FF">process</FONT></B> (GeglOperation       *op,
         <B><FONT COLOR="#228B22">void</FONT></B>                *in_buf,
         <B><FONT COLOR="#228B22">void</FONT></B>                *out_buf,
         glong                n_pixels,
         <B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi,
         gint                 level)
{
  <I><FONT COLOR="#B22222">/* Retrieve a pointer to GeglProperties structure which contains all the
   * chanted properties
   */</FONT></I>
  GeglProperties *o = GEGL_PROPERTIES (op);
  gfloat     * GEGL_ALIGNED in_pixel;
  gfloat     * GEGL_ALIGNED out_pixel;
  gfloat      brightness, contrast;
  glong       i;

  in_pixel   = in_buf;
  out_pixel  = out_buf;

  brightness = o-&gt;brightness;
  contrast   = o-&gt;contrast;

  <B><FONT COLOR="#A020F0">for</FONT></B> (i=0; i&lt;n_pixels; i++)
    {
      out_pixel[0] = (in_pixel[0] - 0.5f) * contrast + brightness + 0.5;
      out_pixel[1] = (in_pixel[1] - 0.5f) * contrast + brightness + 0.5;
      out_pixel[2] = (in_pixel[2] - 0.5f) * contrast + brightness + 0.5;
      out_pixel[3] = in_pixel[3]; <I><FONT COLOR="#B22222">/* copy the alpha */</FONT></I>
      in_pixel  += 4;
      out_pixel += 4;
    }
  <B><FONT COLOR="#A020F0">return</FONT></B> TRUE;
}

#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F">&quot;opencl/brightness-contrast.cl.h&quot;</FONT></B>

<I><FONT COLOR="#B22222">/*
 * The class init function sets up information needed for this operations class
 * (template) in the GObject OO framework.
 */</FONT></I>
<B><FONT COLOR="#228B22">static</FONT></B> <B><FONT COLOR="#228B22">void</FONT></B>
<B><FONT COLOR="#0000FF">gegl_op_class_init</FONT></B> (GeglOpClass *klass)
{
  GeglOperationClass            *operation_class;
  GeglOperationPointFilterClass *point_filter_class;
  gchar                         *composition = <B><FONT COLOR="#BC8F8F">&quot;&lt;?xml version='1.0' encoding='UTF-8'?&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;gegl&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;node operation='gegl:brightness-contrast'&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;  &lt;params&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;    &lt;param name='contrast'&gt;1.8&lt;/param&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;    &lt;param name='brightness'&gt;0.25&lt;/param&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;  &lt;/params&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;/node&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;node operation='gegl:load'&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;  &lt;params&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;    &lt;param name='path'&gt;standard-input.png&lt;/param&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;  &lt;/params&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;/node&gt;&quot;</FONT></B>
    <B><FONT COLOR="#BC8F8F">&quot;&lt;/gegl&gt;&quot;</FONT></B>;

  operation_class    = GEGL_OPERATION_CLASS (klass);
  point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);

  <I><FONT COLOR="#B22222">/* override the prepare methods of the GeglOperation class */</FONT></I>
  operation_class-&gt;prepare = prepare;
  <I><FONT COLOR="#B22222">/* override the process method of the point filter class (the process methods
   * of our superclasses deal with the handling on their level of abstraction)
   */</FONT></I>
  point_filter_class-&gt;process = process;

  gegl_operation_class_set_keys (operation_class,
      <B><FONT COLOR="#BC8F8F">&quot;name&quot;</FONT></B>,       <B><FONT COLOR="#BC8F8F">&quot;gegl:brightness-contrast&quot;</FONT></B>,
      <B><FONT COLOR="#BC8F8F">&quot;title&quot;</FONT></B>,      _(<B><FONT COLOR="#BC8F8F">&quot;Brightness Contrast&quot;</FONT></B>),
      <B><FONT COLOR="#BC8F8F">&quot;categories&quot;</FONT></B>, <B><FONT COLOR="#BC8F8F">&quot;color&quot;</FONT></B>,
      <B><FONT COLOR="#BC8F8F">&quot;reference-hash&quot;</FONT></B>, <B><FONT COLOR="#BC8F8F">&quot;a60848d705029cad1cb89e44feb7f56e&quot;</FONT></B>,
      <B><FONT COLOR="#BC8F8F">&quot;description&quot;</FONT></B>, _(<B><FONT COLOR="#BC8F8F">&quot;Changes the light level and contrast. This operation operates in linear light, 'contrast' is a scale factor around 50%% gray, and 'brightness' a constant offset to apply after contrast scaling.&quot;</FONT></B>),
      <B><FONT COLOR="#BC8F8F">&quot;cl-source&quot;</FONT></B>  , brightness_contrast_cl_source,
      <B><FONT COLOR="#BC8F8F">&quot;reference-composition&quot;</FONT></B>, composition,
      NULL);
}

#<B><FONT COLOR="#5F9EA0">endif</FONT></B> <I><FONT COLOR="#B22222">/* closing #ifdef GEGL_PROPERTIES ... else ... */</FONT></I>
</PRE>
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