GNOME.org
 

[gegl/paint-system: 5/7] Extract vector rendering operations from path.c

commit 89403971d75507477e70b2c72af6112f90848d87
Author: Damien de Lemeny <d delemeny gmail com>
Date:   Thu Jun 10 15:26:17 2010 +0200

    Extract vector rendering operations from path.c
    
    * add vector-fill and vector-stroke operations (use cairo)
    * update Makefile

 operations/external/Makefile.am     |    8 +-
 operations/external/vector-fill.c   |  292 +++++++++++++++++++++++++++++++++++
 operations/external/vector-stroke.c |  286 ++++++++++++++++++++++++++++++++++
 3 files changed, 585 insertions(+), 1 deletions(-)
---
diff --git a/operations/external/Makefile.am b/operations/external/Makefile.am
index b33746e..81d8956 100644
--- a/operations/external/Makefile.am
+++ b/operations/external/Makefile.am
@@ -12,10 +12,16 @@ text_la_CFLAGS = $(AM_CFLAGS) $(PANGOCAIRO_CFLAGS)
 endif
 
 if HAVE_CAIRO
-ops += path.la
+ops += path.la vector-fill.la vector-stroke.la
 path_la_SOURCES = path.c
 path_la_LIBADD = $(op_libs) $(CAIRO_LIBS)
 path_la_CFLAGS = $(AM_CFLAGS) $(CAIRO_CFLAGS)
+vector_fill_la_SOURCES = vector-fill.c
+vector_fill_la_LIBADD = $(op_libs) $(CAIRO_LIBS)
+vector_fill_la_CFLAGS = $(AM_CFLAGS) $(CAIRO_CFLAGS)
+vector_stroke_la_SOURCES = vector-stroke.c
+vector_stroke_la_LIBADD = $(op_libs) $(CAIRO_LIBS)
+vector_stroke_la_CFLAGS = $(AM_CFLAGS) $(CAIRO_CFLAGS)
 endif
 
 if HAVE_PNG
diff --git a/operations/external/vector-fill.c b/operations/external/vector-fill.c
new file mode 100644
index 0000000..725e046
--- /dev/null
+++ b/operations/external/vector-fill.c
@@ -0,0 +1,292 @@
+/* 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 <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2006 �yvind Kolås <pippin gimp org>
+ */
+
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+
+gegl_chant_color  (color,    _("Color"),  "rgba(0.0,0.0,0.0,0.6)",
+                             _("Color of paint to use for filling."))
+
+gegl_chant_double (opacity,  _("Opacity"),  -2.0, 2.0, 1.0,
+                             _("The fill opacity to use."))
+
+gegl_chant_string (fill_rule,_("Fill rule."), "nonzero",
+                             _("how to determine what to fill (nonzero|evenodd"))
+
+gegl_chant_string (transform,_("Transform"), "",
+                             _("svg style description of transform."))
+
+gegl_chant_path   (d,        _("Vector"),
+                             _("A GeglVector representing the path of the stroke"))
+
+#else
+
+#define GEGL_CHANT_TYPE_FILTER
+#define GEGL_CHANT_C_FILE "vector-fill.c"
+
+#include "gegl-plugin.h"
+
+/* the path api isn't public yet */
+#include "property-types/gegl-path.h"
+static void path_changed (GeglPath *path,
+                          const GeglRectangle *roi,
+                          gpointer userdata);
+
+#include "gegl-chant.h"
+#include <cairo.h>
+
+static void path_changed (GeglPath *path,
+                          const GeglRectangle *roi,
+                          gpointer userdata)
+{
+  GeglChantO    *o   = GEGL_CHANT_PROPERTIES (userdata);
+  GeglRectangle rect;
+  gdouble        x0, x1, y0, y1;
+  
+  gegl_path_get_bounds(o->d, &x0, &x1, &y0, &y1);
+  rect.x = x0;
+  rect.y = y0;
+  rect.width = x1 - x0;
+  rect.height = y1 - y0;  
+  
+  gegl_operation_invalidate (userdata, roi, TRUE);
+};
+
+static void
+prepare (GeglOperation *operation)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  gegl_operation_set_format (operation, "output", babl_format ("RaGaBaA float"));
+  if (o->transform && o->transform[0] != '\0')
+    {
+      GeglMatrix3 matrix;
+      gegl_matrix3_parse_string (matrix, o->transform);
+      gegl_path_set_matrix (o->d, matrix);
+    }
+}
+
+static GeglRectangle
+get_bounding_box (GeglOperation *operation)
+{
+  GeglChantO    *o       = GEGL_CHANT_PROPERTIES (operation);
+  GeglRectangle  defined = { 0, 0, 512, 512 };
+  GeglRectangle *in_rect;
+  gdouble        x0, x1, y0, y1;
+
+  in_rect =  gegl_operation_source_get_bounding_box (operation, "input");
+
+  gegl_path_get_bounds (o->d, &x0, &x1, &y0, &y1);
+  defined.x      = x0;
+  defined.y      = y0;
+  defined.width  = x1 - x0;
+  defined.height = y1 - y0;
+
+  if (in_rect)
+    {
+      gegl_rectangle_bounding_box (&defined, &defined, in_rect);
+    }
+
+  return defined;
+}
+
+
+
+#if 0
+static gboolean gegl_path_is_closed (GeglPath *path)
+{
+  const GeglPathItem *knot;
+
+  if (!path)
+    return FALSE;
+  knot = gegl_path_get_node (path, -1);
+  if (!knot)
+    return FALSE;
+  if (knot->type == 'z')
+    {
+      return TRUE;
+    }
+  return FALSE;
+}
+#endif
+
+
+#if 0
+static GeglRectangle
+get_cached_region (GeglOperation *operation)
+{
+  return get_bounding_box (operation);
+}
+#endif
+static void gegl_path_cairo_play (GeglPath *path,
+                                    cairo_t *cr);
+
+static gboolean
+process (GeglOperation       *operation,
+         GeglBuffer          *input,
+         GeglBuffer          *output,
+         const GeglRectangle *result)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  gboolean need_fill = FALSE;
+  gdouble r,g,b,a;
+
+  if (input)
+    {
+      gegl_buffer_copy (input, result, output, result);
+    }
+  else
+    {
+      gegl_buffer_clear (output, result);
+    }
+
+
+  if (o->opacity > 0.0001 && o->color)
+    {
+      gegl_color_get_rgba (o->color, &r,&g,&b,&a);
+      a *= o->opacity;
+      if (a>0.001)
+          need_fill=TRUE;
+    }
+
+  if (need_fill)   
+    {
+      GStaticMutex mutex = G_STATIC_MUTEX_INIT;
+      cairo_t *cr;
+      cairo_surface_t *surface;
+      guchar *data;
+
+      
+      g_static_mutex_lock (&mutex);      
+      data = (void*)gegl_buffer_linear_open (output, result, NULL, babl_format ("B'aG'aR'aA u8"));
+      surface = cairo_image_surface_create_for_data (data,
+                                                     CAIRO_FORMAT_ARGB32,
+                                                     result->width,
+                                                     result->height,
+                                                     result->width * 4);
+      
+      cr = cairo_create (surface);
+      cairo_translate (cr, -result->x, -result->y);
+      if (g_str_equal (o->fill_rule, "evenodd"))
+          cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+
+      gegl_path_cairo_play (o->d, cr);
+      cairo_set_source_rgba (cr, r,g,b,a);
+      cairo_fill (cr);
+      cairo_destroy (cr);
+      
+      gegl_buffer_linear_close (output, data);
+      g_static_mutex_unlock (&mutex);
+    }
+  return  TRUE;
+}
+
+static void foreach_cairo (const GeglPathItem *knot,
+                           gpointer              cr)
+{
+  switch (knot->type)
+    {
+      case 'M':
+        cairo_move_to (cr, knot->point[0].x, knot->point[0].y);
+        break;
+      case 'L':
+        cairo_line_to (cr, knot->point[0].x, knot->point[0].y);
+        break;
+      case 'C':
+        cairo_curve_to (cr, knot->point[0].x, knot->point[0].y,
+                            knot->point[1].x, knot->point[1].y,
+                            knot->point[2].x, knot->point[2].y);
+        break;
+      case 'z':
+        cairo_close_path (cr);
+        break;
+      default:
+        g_print ("%s uh?:%c\n", G_STRLOC, knot->type);
+    }
+}
+
+static void gegl_path_cairo_play (GeglPath *path,
+                                    cairo_t *cr)
+{
+  gegl_path_foreach_flat (path, foreach_cairo, cr);
+}
+
+static GeglNode *detect (GeglOperation *operation,
+                         gint           x,
+                         gint           y)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  cairo_t *cr;
+  cairo_surface_t *surface;
+  gchar *data = "     ";
+  gboolean result = FALSE;
+
+  surface = cairo_image_surface_create_for_data ((guchar*)data,
+                                                 CAIRO_FORMAT_ARGB32,
+                                                 1,1,4);
+  cr = cairo_create (surface);
+  gegl_path_cairo_play (o->d, cr);
+
+  if (!result)
+    {
+      if (o->d)
+        {
+          gdouble r,g,b,a;
+          gegl_color_get_rgba (o->color, &r,&g,&b,&a);
+          if (a * o->opacity>0.8)
+            result = cairo_in_fill (cr, x, y);
+        }
+    }
+
+  cairo_destroy (cr);
+
+  if (result)
+    return operation->node;
+
+  return NULL;
+}
+
+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->get_bounding_box = get_bounding_box;
+  operation_class->prepare = prepare;
+  operation_class->detect = detect;
+  /*operation_class->no_cache = TRUE;*/
+
+  operation_class->name        = "gegl:vector-fill";
+  operation_class->categories  = "render";
+  operation_class->description = _("Renders a filled region");
+#if 0
+  operation_class->get_cached_region = (void*)get_cached_region;
+#endif
+}
+
+
+#endif
diff --git a/operations/external/vector-stroke.c b/operations/external/vector-stroke.c
new file mode 100644
index 0000000..7250dc3
--- /dev/null
+++ b/operations/external/vector-stroke.c
@@ -0,0 +1,286 @@
+/* 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 <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2006 �yvind Kolås <pippin gimp org>
+ */
+
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+
+gegl_chant_color  (color,    _("Color"),      "rgba(0.0,0.0,0.0,0.0)",
+                             _("Color of paint to use for stroking."))
+
+gegl_chant_double (width,    _("Width"),  0.0, 200.0, 2.0,
+                             _("The width of the brush used to stroke the path."))
+
+gegl_chant_double (opacity,  _("Opacity"),  -2.0, 2.0, 1.0,
+                             _("Opacity of stroke, note, does not behave like SVG since at the moment stroking is done using an airbrush tool."))
+
+gegl_chant_string (transform,_("Transform"), "",
+                             _("svg style description of transform."))
+
+gegl_chant_path   (d,        _("Vector"),
+                             _("A GeglVector representing the path of the stroke"))
+
+#else
+
+#define GEGL_CHANT_TYPE_FILTER
+#define GEGL_CHANT_C_FILE "vector-stroke.c"
+
+#include "gegl-plugin.h"
+
+/* the path api isn't public yet */
+#include "property-types/gegl-path.h"
+static void path_changed (GeglPath *path,
+                          const GeglRectangle *roi,
+                          gpointer userdata);
+
+#include "gegl-chant.h"
+#include <cairo.h>
+
+static void path_changed (GeglPath *path,
+                          const GeglRectangle *roi,
+                          gpointer userdata)
+{
+  GeglRectangle rect = *roi;
+  GeglChantO    *o   = GEGL_CHANT_PROPERTIES (userdata);
+  /* invalidate the incoming rectangle */
+
+  rect.x -= o->width/2;
+  rect.y -= o->width/2;
+  rect.width += o->width;
+  rect.height += o->width;
+
+  gegl_operation_invalidate (userdata, &rect, FALSE);
+};
+
+static void
+prepare (GeglOperation *operation)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  gegl_operation_set_format (operation, "output", babl_format ("RaGaBaA float"));
+  if (o->transform && o->transform[0] != '\0')
+    {
+      GeglMatrix3 matrix;
+      gegl_matrix3_parse_string (matrix, o->transform);
+      gegl_path_set_matrix (o->d, matrix);
+    }
+}
+
+static GeglRectangle
+get_bounding_box (GeglOperation *operation)
+{
+  GeglChantO    *o       = GEGL_CHANT_PROPERTIES (operation);
+  GeglRectangle  defined = { 0, 0, 512, 512 };
+  GeglRectangle *in_rect;
+  gdouble        x0, x1, y0, y1;
+
+  in_rect =  gegl_operation_source_get_bounding_box (operation, "input");
+
+  gegl_path_get_bounds (o->d, &x0, &x1, &y0, &y1);
+  defined.x      = x0 - o->width/2;
+  defined.y      = y0 - o->width/2;
+  defined.width  = x1 - x0 + o->width;
+  defined.height = y1 - y0 + o->width;
+
+  if (in_rect)
+    {
+      gegl_rectangle_bounding_box (&defined, &defined, in_rect);
+    }
+
+  return defined;
+}
+
+
+
+#if 0
+static gboolean gegl_path_is_closed (GeglPath *path)
+{
+  const GeglPathItem *knot;
+
+  if (!path)
+    return FALSE;
+  knot = gegl_path_get_node (path, -1);
+  if (!knot)
+    return FALSE;
+  if (knot->type == 'z')
+    {
+      return TRUE;
+    }
+  return FALSE;
+}
+#endif
+
+
+#if 0
+static GeglRectangle
+get_cached_region (GeglOperation *operation)
+{
+  return get_bounding_box (operation);
+}
+#endif
+static void gegl_path_cairo_play (GeglPath *path,
+                                    cairo_t *cr);
+
+static gboolean
+process (GeglOperation       *operation,
+         GeglBuffer          *input,
+         GeglBuffer          *output,
+         const GeglRectangle *result)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+
+  if (input)
+    {
+      gegl_buffer_copy (input, result, output, result);
+    }
+  else
+    {
+      gegl_buffer_clear (output, result);
+    }
+
+  gboolean need_stroke = FALSE;
+  gdouble r,g,b,a;
+
+  if (o->width > 0.1 && o->opacity > 0.0001)
+    {
+      gegl_color_get_rgba (o->color, &r,&g,&b,&a);
+      a *= o->opacity;
+      if (a>0.001)
+          need_stroke=TRUE;
+    }
+
+  if (need_stroke)   
+    {
+      GStaticMutex mutex = G_STATIC_MUTEX_INIT;
+      cairo_t *cr;
+      cairo_surface_t *surface;
+      guchar *data;
+      
+      g_static_mutex_lock (&mutex);
+      data = (void*)gegl_buffer_linear_open (output, result, NULL, babl_format ("B'aG'aR'aA u8"));
+      surface = cairo_image_surface_create_for_data (data,
+                                                     CAIRO_FORMAT_ARGB32,
+                                                     result->width,
+                                                     result->height,
+                                                     result->width * 4);
+      
+      cr = cairo_create (surface);
+      
+      cairo_translate (cr, -result->x, -result->y);
+      
+      cairo_set_line_width  (cr, o->width);
+      cairo_set_line_cap    (cr, CAIRO_LINE_CAP_ROUND);
+      cairo_set_line_join   (cr, CAIRO_LINE_JOIN_ROUND);
+      
+      gegl_path_cairo_play (o->d, cr);
+      cairo_set_source_rgba (cr, r,g,b,a);
+      cairo_stroke (cr);      
+      cairo_destroy (cr);
+      
+      gegl_buffer_linear_close (output, data);
+      g_static_mutex_unlock (&mutex);
+    }
+  return  TRUE;
+} 
+static void foreach_cairo (const GeglPathItem *knot,
+                           gpointer              cr)
+{
+  switch (knot->type)
+    {
+      case 'M':
+        cairo_move_to (cr, knot->point[0].x, knot->point[0].y);
+        break;
+      case 'L':
+        cairo_line_to (cr, knot->point[0].x, knot->point[0].y);
+        break;
+      case 'C':
+        cairo_curve_to (cr, knot->point[0].x, knot->point[0].y,
+                            knot->point[1].x, knot->point[1].y,
+                            knot->point[2].x, knot->point[2].y);
+        break;
+      case 'z':
+        cairo_close_path (cr);
+        break;
+      default:
+        g_print ("%s uh?:%c\n", G_STRLOC, knot->type);
+    }
+}
+
+static void gegl_path_cairo_play (GeglPath *path,
+                                    cairo_t *cr)
+{
+  gegl_path_foreach_flat (path, foreach_cairo, cr);
+}
+
+static GeglNode *detect (GeglOperation *operation,
+                         gint           x,
+                         gint           y)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  cairo_t *cr;
+  cairo_surface_t *surface;
+  gchar *data = "     ";
+  gboolean result = FALSE;
+
+  surface = cairo_image_surface_create_for_data ((guchar*)data,
+                                                 CAIRO_FORMAT_ARGB32,
+                                                 1,1,4);
+  cr = cairo_create (surface);
+  gegl_path_cairo_play (o->d, cr);
+  cairo_set_line_width (cr, o->width);
+
+
+  if (o->width > 0.1 && o->opacity > 0.0001)
+    result = cairo_in_stroke (cr, x, y);
+
+  cairo_destroy (cr);
+
+  if (result)
+    return operation->node;
+
+  return NULL;
+}
+
+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->get_bounding_box = get_bounding_box;
+  operation_class->prepare = prepare;
+  operation_class->detect = detect;
+  /*operation_class->no_cache = TRUE;*/
+
+  operation_class->name        = "gegl:vector-stroke";
+  operation_class->categories  = "render";
+  operation_class->description = _("Renders a vector stroke");
+#if 0
+  operation_class->get_cached_region = (void*)get_cached_region;
+#endif
+}
+
+
+#endif
[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]