On Wed, Apr 13, 2011 at 3:21 AM, sourav de <souravde1...@gmail.com> wrote:

>
>
> On Tue, Apr 12, 2011 at 10:55 PM, sourav de <souravde1...@gmail.com>wrote:
>
>>
>>
>> On Thu, Apr 7, 2011 at 5:36 PM, Mukund Sivaraman <m...@mukund.org> wrote:
>>
>>> Hi Sourav
>>>
>>> On Wed, Apr 06, 2011 at 09:44:31PM +0530, sourav de wrote:
>>> > I tried to implement the blur operation in GEGL. The algorithm is same
>>> as of
>>> > the blur plug-in in GIMP. The patch file for GEGL operation and the
>>> blur.c
>>> > file for the plug-in are attached below. Kindly let me know if there is
>>> any
>>> > mistake in my implementation.
>>> >
>>> > +{
>>> > +dst_buf[offset*4+c]=ROUND(
>>> > +                           ((gdouble) (src_pix[c-src_width*4 - 4] *
>>> src_pix[c-src_width*4 - c])
>>> > +                            + (gdouble) (src_pix[c-src_width*4] *
>>> src_pix[c-src_width*4 + 4 - c])
>>> > +                            + (gdouble) (src_pix[c-src_width*4 + 4] *
>>> src_pix[c-src_width*4 + 2*4 - c])
>>> > +                            + (gdouble) (src_pix[c - bytes] *
>>> src_pix[c - c])
>>> > +                            + (gdouble) (src_pix[c] * src_pix[c + 4 -
>>> c])
>>> > +                            + (gdouble) (src_pix[c + 4] * src_pix[c +
>>> 2*4 - c])
>>> > +                            + (gdouble) (src_pix[c+src_width*4 - 4] *
>>> src_pix[c+src_width*4 - c])
>>> > +                            + (gdouble) (src_pix[c+src_width*4] *
>>> src_pix[c+src_width*4 + 4 - c])
>>> > +                            + (gdouble) (src_pix[c+src_width*4 + 4] *
>>> src_pix[c+src_width*4 + 2*4 - c]))
>>> > +                           / ((gdouble) src_pix[c-src_width*4 - c]
>>> > +                              + (gdouble) src_pix[c-src_width*4 + 4 -
>>> c]
>>> > +                              + (gdouble) src_pix[c-src_width*4 + 2*4
>>> - c]
>>> > +                              + (gdouble) src_pix[c -c]
>>> > +                              + (gdouble) src_pix[c + 4 - c]
>>> > +                              + (gdouble) src_pix[c + 2*4 - c]
>>> > +                              + (gdouble) src_pix[c+src_width*4 - c]
>>> > +                              + (gdouble) src_pix[c+src_width*4 + 4 -
>>> c]
>>> > +                              + (gdouble) src_pix[c+src_width*4 + 2*4
>>> - c]));
>>> > +
>>> > +}
>>> > +
>>> > +dst_buf[offset*4+3]=
>>> ((gint)src_pix[c-4-src_width*4]+(gint)src_pix[c-src_width*4]+(gint)src_pix[c+4-src_width*4]
>>> +
>>> > +     (gint)src_pix[c-4]+(gint)src_pix[c]+(gint)src_pix[c+4]+
>>> > +
>>> (gint)src_pix[c-4+src_width*4]+(gint)src_pix[c+src_width*4]+(gint)src_pix[c+4+src_width*4]+4)/9;
>>>
>>> Did this code work for you? Were you able to use this inside GEGL to
>>> perform a blur?
>>>
>>> You can help me review this code if you clean it up and comment it.
>>>
>>>                Mukund
>>>
>>
>> Hi,
>>
>> I changed the code little bit.
>> I placed the blur.c file in gegl-0.1.2/operations/common folder & followed
>> these steps to compile GEGL.
>>
>> 1. configure
>> 2. make
>> 3. make install
>>
>> it compiled successfully. But I don't know how to check whether it runs or
>> not. Please help me finding this out & cleaning it up. Sorry for replying
>> late.
>>
>>
>>
>> --
>> Sourav De
>> 2nd Year Student
>> Department of Computer Science and Engineering
>> IIT KHARAGPUR
>>
>>
> I overlooked the option in GIMP to run GEGL operation. Now I have checked
> it, and it works.
>
> --
> Sourav De
> 2nd Year Student
> Department of Computer Science and Engineering
> IIT KHARAGPUR
>
>
I've revised my code. It performs blur operation successfully.

Regards,

-- 
Sourav De
2nd Year Student
Department of Computer Science and Engineering
IIT KHARAGPUR
#include "config.h"
#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

gegl_chant_int    (radius, _("Radius"), 0, 50, 3,
   _("Blur Radius"))

#else

#define GEGL_CHANT_TYPE_AREA_FILTER
#define GEGL_CHANT_C_FILE  "blur.c"

#include <gegl-chant.h>
#include <math.h>
#include <stdio.h>

#define BLUR_RADIUS 1;

static void blur(GeglBuffer *src,const GeglRectangle *src_rect,GeglBuffer *dst,const GeglRectangle *dst_rect,gint radius);

static inline void  prepare(GeglOperation *operation)
{
GeglChantO              *o       = GEGL_CHANT_PROPERTIES (operation);
GeglOperationAreaFilter *area = GEGL_OPERATION_AREA_FILTER (operation);
area->left = area->right = area->top = area->bottom=o->radius;
gegl_operation_set_format (operation, "input", babl_format ("RaGaBaA float"));
gegl_operation_set_format (operation, "output", babl_format ("RaGaBaA float"));
}

static gboolean process (GeglOperation *operation, GeglBuffer *input, GeglBuffer *output, const GeglRectangle *result)
{
GeglChantO   *o = GEGL_CHANT_PROPERTIES (operation);
GeglRectangle rect;

GeglOperationAreaFilter *op_area;
  op_area = GEGL_OPERATION_AREA_FILTER (operation);

rect.x      = result->x - op_area->left;
  rect.width  = result->width + op_area->left + op_area->right;
  rect.y      = result->y - op_area->top;
  rect.height = result->height + op_area->top + op_area->bottom;

blur(input, &rect, output, result,o->radius);
return TRUE;
}


static void blur (GeglBuffer *src,const GeglRectangle *src_rect,GeglBuffer *dst,const GeglRectangle *dst_rect,gint radius)
{
gint x,y;
gint i,j;
gint a,b;
gfloat *src_buf,*dst_buf;
gint offset;


src_buf = g_new0 (gfloat, src_rect->width * src_rect->height * 4);
dst_buf = g_new0 (gfloat, dst_rect->width * dst_rect->height * 4);



gegl_buffer_get (src, 1.0, src_rect, babl_format ("RaGaBaA float"), src_buf, GEGL_AUTO_ROWSTRIDE);

gint src_width=src_rect->width;

offset=0;
for(y=0; y<dst_rect->height; y++)
{
for (x=0; x<dst_rect->width; x++)
{

gfloat gradient[4] = {0.0f, 0.0f, 0.0f, 0.0f};

gint c;
i=x+radius;
 j=y+radius;
gfloat *src_pix = src_buf + (i + j * src_width) * 4;

for (c=0;c<4;c++)
{

for (a = -radius; a <= radius; ++a)
{
for (b = -radius; b <= radius; ++b)
{
  gradient[c]+= src_pix[c+a*src_width*4+4*b];
}
}

gradient[c]/=pow((radius * 2 + 1),2);

}




for (c=0; c<4;c++)
          dst_buf[offset*4+c] = gradient[c];


offset++;
}

}

gegl_buffer_set (dst, dst_rect, babl_format ("RaGaBaA float"), dst_buf,GEGL_AUTO_ROWSTRIDE);

g_free (src_buf);
g_free (dst_buf);

}

static void
gegl_chant_class_init (GeglChantClass *klass)
{
  GeglOperationClass       *operation_class;
  GeglOperationFilterClass *filter_class;

  operation_class = GEGL_OPERATION_CLASS (klass);
  filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);

  filter_class->process    = process;
  operation_class->prepare = prepare;

  operation_class->categories  = "blur";
  operation_class->name        = "gegl:blur";
  operation_class->description =
       _("Performs an averaging of pixels.");
}

#endif
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