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<HTML>
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<HEAD>
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<TITLE>Enscript Output</TITLE>
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</HEAD>
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<BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#1F00FF" ALINK="#FF0000" VLINK="#9900DD">
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../operations/common/brightness-contrast.c
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<FONT COLOR="#B22222">/* This file is an image processing operation for GEGL
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*
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* GEGL is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* GEGL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
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*/</FONT>
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#<FONT COLOR="#5F9EA0">include</FONT> <FONT COLOR="#BC8F8F">"config.h"</FONT>
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#<FONT COLOR="#5F9EA0">include</FONT> <FONT COLOR="#BC8F8F"><glib/gi18n-lib.h></FONT>
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<FONT COLOR="#B22222">/* Followed by this #if ... */</FONT>
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#<FONT COLOR="#5F9EA0">ifdef</FONT> <FONT COLOR="#B8860B">GEGL_CHANT_PROPERTIES</FONT>
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<FONT COLOR="#B22222">/* ... are the properties of the filter, these are all scalar values
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* (doubles), the the parameters are:
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* property name, min, max, default, "description of property"
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*/</FONT>
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<FONT COLOR="#0000FF">gegl_chant_double_ui</FONT> (contrast, _(<FONT COLOR="#BC8F8F">"Contrast"</FONT>), -5.0, 5.0, 1.0, 0.0, 2.0, 1.0,
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_(<FONT COLOR="#BC8F8F">"Range scale factor"</FONT>))
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<FONT COLOR="#0000FF">gegl_chant_double_ui</FONT> (brightness, _(<FONT COLOR="#BC8F8F">"Brightness"</FONT>), -3.0, 3.0, 0.0, -1.0, 1.0, 1.0,
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_(<FONT COLOR="#BC8F8F">"Amount to increase brightness"</FONT>))
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<FONT COLOR="#B22222">/* this will create the instance structure for our use, and register the
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* property with the given ranges, default values and a comment for the
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* documentation/tooltip.
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*/</FONT>
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#<FONT COLOR="#5F9EA0">else</FONT>
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<FONT COLOR="#B22222">/* Specify the base class we're building our operation on, the base
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* class provides a lot of the legwork so we do not have to. For
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* brightness contrast the best base class is the POINT_FILTER base
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* class.
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*/</FONT>
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#<FONT COLOR="#5F9EA0">define</FONT> <FONT COLOR="#B8860B">GEGL_CHANT_TYPE_POINT_FILTER</FONT>
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<FONT COLOR="#B22222">/* We specify the file we're in, this is needed to make the code
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* generation for the properties work.
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*/</FONT>
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#<FONT COLOR="#5F9EA0">define</FONT> <FONT COLOR="#B8860B">GEGL_CHANT_C_FILE</FONT> <FONT COLOR="#BC8F8F">"brightness-contrast.c"</FONT>
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<FONT COLOR="#B22222">/* Including gegl-chant.h creates most of the GObject boiler plate
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* needed, creating a GeglChant instance structure a GeglChantClass
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* structure for our operation, as well as the needed code to register
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* our new gobject with GEGL.
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*/</FONT>
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#<FONT COLOR="#5F9EA0">include</FONT> <FONT COLOR="#BC8F8F">"gegl-chant.h"</FONT>
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<FONT COLOR="#B22222">/* prepare() is called on each operation providing data to a node that
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* is requested to provide a rendered result. When prepare is called
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* all properties are known. For brightness contrast we use this
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* opportunity to dictate the formats of the input and output buffers.
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*/</FONT>
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<FONT COLOR="#228B22">static</FONT> <FONT COLOR="#228B22">void</FONT> <FONT COLOR="#0000FF">prepare</FONT> (GeglOperation *operation)
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{
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gegl_operation_set_format (operation, <FONT COLOR="#BC8F8F">"input"</FONT>, babl_format (<FONT COLOR="#BC8F8F">"RGBA float"</FONT>));
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gegl_operation_set_format (operation, <FONT COLOR="#BC8F8F">"output"</FONT>, babl_format (<FONT COLOR="#BC8F8F">"RGBA float"</FONT>));
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}
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<FONT COLOR="#B22222">/* For GeglOperationPointFilter subclasses, we operate on linear
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* buffers with a pixel count.
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*/</FONT>
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<FONT COLOR="#228B22">static</FONT> gboolean
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<FONT COLOR="#0000FF">process</FONT> (GeglOperation *op,
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<FONT COLOR="#228B22">void</FONT> *in_buf,
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<FONT COLOR="#228B22">void</FONT> *out_buf,
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glong n_pixels,
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<FONT COLOR="#228B22">const</FONT> GeglRectangle *roi,
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gint level)
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{
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<FONT COLOR="#B22222">/* Retrieve a pointer to GeglChantO structure which contains all the
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* chanted properties
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*/</FONT>
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GeglChantO *o = GEGL_CHANT_PROPERTIES (op);
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gfloat * GEGL_ALIGNED in_pixel;
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gfloat * GEGL_ALIGNED out_pixel;
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gfloat brightness, contrast;
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glong i;
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in_pixel = in_buf;
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out_pixel = out_buf;
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brightness = o->brightness;
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contrast = o->contrast;
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<FONT COLOR="#A020F0">for</FONT> (i=0; i<n_pixels; i++)
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{
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out_pixel[0] = (in_pixel[0] - 0.5f) * contrast + brightness + 0.5;
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out_pixel[1] = (in_pixel[1] - 0.5f) * contrast + brightness + 0.5;
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out_pixel[2] = (in_pixel[2] - 0.5f) * contrast + brightness + 0.5;
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out_pixel[3] = in_pixel[3]; <FONT COLOR="#B22222">/* copy the alpha */</FONT>
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in_pixel += 4;
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out_pixel += 4;
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}
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<FONT COLOR="#A020F0">return</FONT> TRUE;
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}
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#<FONT COLOR="#5F9EA0">include</FONT> <FONT COLOR="#BC8F8F">"opencl/gegl-cl.h"</FONT>
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<FONT COLOR="#228B22">static</FONT> <FONT COLOR="#228B22">const</FONT> <FONT COLOR="#228B22">char</FONT>* kernel_source =
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<FONT COLOR="#BC8F8F">"__kernel void kernel_bc(__global const float4 *in, \n"</FONT>
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<FONT COLOR="#BC8F8F">" __global float4 *out, \n"</FONT>
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<FONT COLOR="#BC8F8F">" float brightness, \n"</FONT>
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<FONT COLOR="#BC8F8F">" float contrast) \n"</FONT>
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<FONT COLOR="#BC8F8F">"{ \n"</FONT>
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<FONT COLOR="#BC8F8F">" int gid = get_global_id(0); \n"</FONT>
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<FONT COLOR="#BC8F8F">" float4 in_v = in[gid]; \n"</FONT>
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<FONT COLOR="#BC8F8F">" float4 out_v; \n"</FONT>
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<FONT COLOR="#BC8F8F">" out_v.xyz = (in_v.xyz - 0.5f) * contrast + brightness + 0.5f;\n"</FONT>
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<FONT COLOR="#BC8F8F">" out_v.w = in_v.w; \n"</FONT>
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<FONT COLOR="#BC8F8F">" out[gid] = out_v; \n"</FONT>
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<FONT COLOR="#BC8F8F">"} \n"</FONT>;
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<FONT COLOR="#228B22">static</FONT> gegl_cl_run_data *cl_data = NULL;
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<FONT COLOR="#B22222">/* OpenCL processing function */</FONT>
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<FONT COLOR="#228B22">static</FONT> cl_int
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<FONT COLOR="#0000FF">cl_process</FONT> (GeglOperation *op,
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cl_mem in_tex,
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cl_mem out_tex,
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size_t global_worksize,
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<FONT COLOR="#228B22">const</FONT> GeglRectangle *roi,
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<FONT COLOR="#228B22">int</FONT> level)
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{
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<FONT COLOR="#B22222">/* Retrieve a pointer to GeglChantO structure which contains all the
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* chanted properties
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*/</FONT>
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GeglChantO *o = GEGL_CHANT_PROPERTIES (op);
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gfloat brightness = o->brightness;
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gfloat contrast = o->contrast;
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cl_int cl_err = 0;
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<FONT COLOR="#A020F0">if</FONT> (!cl_data)
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{
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<FONT COLOR="#228B22">const</FONT> <FONT COLOR="#228B22">char</FONT> *kernel_name[] = {<FONT COLOR="#BC8F8F">"kernel_bc"</FONT>, NULL};
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cl_data = gegl_cl_compile_and_build (kernel_source, kernel_name);
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}
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<FONT COLOR="#A020F0">if</FONT> (!cl_data) <FONT COLOR="#A020F0">return</FONT> 1;
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cl_err |= gegl_clSetKernelArg(cl_data->kernel[0], 0, <FONT COLOR="#A020F0">sizeof</FONT>(cl_mem), (<FONT COLOR="#228B22">void</FONT>*)&in_tex);
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cl_err |= gegl_clSetKernelArg(cl_data->kernel[0], 1, <FONT COLOR="#A020F0">sizeof</FONT>(cl_mem), (<FONT COLOR="#228B22">void</FONT>*)&out_tex);
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cl_err |= gegl_clSetKernelArg(cl_data->kernel[0], 2, <FONT COLOR="#A020F0">sizeof</FONT>(cl_float), (<FONT COLOR="#228B22">void</FONT>*)&brightness);
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cl_err |= gegl_clSetKernelArg(cl_data->kernel[0], 3, <FONT COLOR="#A020F0">sizeof</FONT>(cl_float), (<FONT COLOR="#228B22">void</FONT>*)&contrast);
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<FONT COLOR="#A020F0">if</FONT> (cl_err != CL_SUCCESS) <FONT COLOR="#A020F0">return</FONT> cl_err;
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cl_err = gegl_clEnqueueNDRangeKernel(gegl_cl_get_command_queue (),
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cl_data->kernel[0], 1,
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NULL, &global_worksize, NULL,
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0, NULL, NULL);
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<FONT COLOR="#A020F0">if</FONT> (cl_err != CL_SUCCESS) <FONT COLOR="#A020F0">return</FONT> cl_err;
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<FONT COLOR="#A020F0">return</FONT> cl_err;
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}
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<FONT COLOR="#B22222">/*
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* The class init function sets up information needed for this operations class
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* (template) in the GObject OO framework.
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*/</FONT>
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<FONT COLOR="#228B22">static</FONT> <FONT COLOR="#228B22">void</FONT>
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<FONT COLOR="#0000FF">gegl_chant_class_init</FONT> (GeglChantClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointFilterClass *point_filter_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
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<FONT COLOR="#B22222">/* override the prepare methods of the GeglOperation class */</FONT>
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operation_class->prepare = prepare;
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<FONT COLOR="#B22222">/* override the process method of the point filter class (the process methods
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* of our superclasses deal with the handling on their level of abstraction)
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*/</FONT>
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point_filter_class->process = process;
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point_filter_class->cl_process = cl_process;
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<FONT COLOR="#B22222">/* specify the name this operation is found under in the GUI/when
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* programming/in XML
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*/</FONT>
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operation_class->opencl_support = TRUE;
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gegl_operation_class_set_keys (operation_class,
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<FONT COLOR="#BC8F8F">"name"</FONT>, <FONT COLOR="#BC8F8F">"gegl:brightness-contrast"</FONT>,
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<FONT COLOR="#BC8F8F">"categories"</FONT>, <FONT COLOR="#BC8F8F">"color"</FONT>,
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<FONT COLOR="#BC8F8F">"description"</FONT>, _(<FONT COLOR="#BC8F8F">"Changes the light level and contrast."</FONT>),
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NULL);
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}
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#<FONT COLOR="#5F9EA0">endif</FONT> <FONT COLOR="#B22222">/* closing #ifdef GEGL_CHANT_PROPERTIES ... else ... */</FONT>
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<ADDRESS>Generated by GNU Enscript 1.6.5.90.</ADDRESS>
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</BODY>
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</HTML>
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