On Thu, Apr 7, 2011 at 5:36 PM, Mukund Sivaraman <muks@xxxxxxxxxx> 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
I've revised my code. It compiles and runs successfully. The patch is attached below. If still there is any mistake, kindly let me know it.
--
Sourav De
2nd Year Student
Department of Computer Science and Engineering
IIT KHARAGPUR
From 19d005775c6b49f3dbecec17eeaa606aa2a4f7b6 Mon Sep 17 00:00:00 2001
From: Sourav De <souravde1991@xxxxxxxxx>
Date: Thu, 7 Apr 2011 20:42:21 +0530
Subject: [PATCH] first commit
---
blur.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 123 insertions(+), 0 deletions(-)
create mode 100644 blur.c
diff --git a/blur.c b/blur.c
new file mode 100644
index 0000000..b991310
--- /dev/null
+++ b/blur.c
@@ -0,0 +1,123 @@
+#include "config.h"
+#include <string.h>
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+#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);
+
+static inline void prepare(GeglOperation *operation)
+{
+GeglOperationAreaFilter *area = GEGL_OPERATION_AREA_FILTER (operation);
+area->left = area->right = area->top = area->bottom=BLUR_RADIUS;
+gegl_operation_set_format (operation, "input", babl_format ("RGBA float"));
+gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
+}
+
+static gboolean process (GeglOperation *operation, GeglBuffer *input, GeglBuffer *output, const GeglRectangle *result)
+{
+GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+GeglRectangle compute;
+compute = gegl_operation_get_required_for_output (operation, "input",result);
+blur(input, &compute, output, result);
+return TRUE;
+}
+
+
+static void blur (GeglBuffer *src,const GeglRectangle *src_rect,GeglBuffer *dst,const GeglRectangle *dst_rect)
+{
+gint x,y;
+gint i,j;
+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);
+
+gint src_width=src_rect->width;
+
+gegl_buffer_get (src, 1.0, src_rect, babl_format ("RGBA float"), src_buf, GEGL_AUTO_ROWSTRIDE);
+
+offset=0;
+for(y=0; y<dst_rect->height; y++)
+{
+for (x=0; x<dst_rect->width; x++)
+{
+
+gint c;
+i=x+BLUR_RADIUS;
+ j=y+BLUR_RADIUS;
+gfloat *src_pix = src_buf + (i + j * src_width) * 4;
+
+for (c=0;c<3;c++)
+{
+dst_buf[offset*4+c]=lround(
+ ((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 - 4] * 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;
+
+
+
+offset++;
+}
+
+}
+
+gegl_buffer_set (dst, dst_rect, babl_format ("RGBA 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
--
1.7.0.4
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