[gimp/metadata-browser] app: fix up dissolve mode



commit 94e288953e27db3a1c5c3133daa5a76b04395b0d
Author: Ãyvind KolÃs <pippin gimp org>
Date:   Sat Mar 31 21:13:49 2012 +0100

    app: fix up dissolve mode
    
    It produces some garbage, but it is 99.5% compliant with the output of legacy
    gimp dissolve mode now.

 app/gegl/gimpoperationdissolvemode.c |  247 +++++++++-------------------------
 app/gegl/gimpoperationdissolvemode.h |    7 +-
 2 files changed, 66 insertions(+), 188 deletions(-)
---
diff --git a/app/gegl/gimpoperationdissolvemode.c b/app/gegl/gimpoperationdissolvemode.c
index 47827a4..32e03cf 100644
--- a/app/gegl/gimpoperationdissolvemode.c
+++ b/app/gegl/gimpoperationdissolvemode.c
@@ -3,6 +3,7 @@
  *
  * gimpoperationdissolvemode.c
  * Copyright (C) 2012 Ville Sokk <ville sokk gmail com>
+ *               2012 Ãyvind KolÃs <pippin gimp org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -30,35 +31,17 @@
 
 #define RANDOM_TABLE_SIZE 4096
 
-enum
-{
-  PROP_0,
-  PROP_PREMULTIPLIED
-};
-
-
-static void          gimp_operation_dissolve_mode_set_property            (GObject                   *object,
-                                                                           guint                      property_id,
-                                                                           const GValue              *value,
-                                                                           GParamSpec                *pspec);
-static void          gimp_operation_dissolve_mode_get_property            (GObject                   *object,
-                                                                           guint                      property_id,
-                                                                           GValue                    *value,
-                                                                           GParamSpec                *pspec);
-static void          gimp_operation_dissolve_mode_prepare                 (GeglOperation             *operation);
-static GeglRectangle gimp_operation_dissolve_mode_get_required_for_output (GeglOperation             *operation,
-                                                                           const gchar               *input_pad,
-                                                                           const GeglRectangle       *roi);
-static gboolean gimp_operation_dissolve_mode_process                      (GeglOperation             *operation,
-                                                                           GeglBuffer                *input,
-                                                                           GeglBuffer                *aux,
-                                                                           GeglBuffer                *output,
-                                                                           const GeglRectangle       *result,
-                                                                           gint                       level);
-
+static void     gimp_operation_dissolve_mode_prepare (GeglOperation       *operation);
+static gboolean gimp_operation_dissolve_mode_process (GeglOperation       *operation,
+                                                      void                *in_buf,
+                                                      void                *aux_buf,
+                                                      void                *out_buf,
+                                                      glong                samples,
+                                                      const GeglRectangle *result,
+                                                      gint                 level);
 
 G_DEFINE_TYPE (GimpOperationDissolveMode, gimp_operation_dissolve_mode,
-               GEGL_TYPE_OPERATION_COMPOSER)
+               GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
 
 static gint32 random_table[RANDOM_TABLE_SIZE];
 
@@ -66,14 +49,14 @@ static gint32 random_table[RANDOM_TABLE_SIZE];
 static void
 gimp_operation_dissolve_mode_class_init (GimpOperationDissolveModeClass *klass)
 {
-  GObjectClass               *object_class    = G_OBJECT_CLASS (klass);
-  GeglOperationClass         *operation_class = GEGL_OPERATION_CLASS (klass);
-  GeglOperationComposerClass *composer_class  = GEGL_OPERATION_COMPOSER_CLASS (klass);
-  GRand                      *gr;
-  gint                        i;
+  GeglOperationClass              *operation_class;
+  GeglOperationPointComposerClass *point_composer_class;
+  GRand                           *gr;
+  gint                             i;
+  static gboolean table_initialized = FALSE;
 
-  object_class->set_property = gimp_operation_dissolve_mode_set_property;
-  object_class->get_property = gimp_operation_dissolve_mode_get_property;
+  operation_class = GEGL_OPERATION_CLASS (klass);
+  point_composer_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
 
   gegl_operation_class_set_keys (operation_class,
                                  "name",        "gimp:dissolve-mode",
@@ -81,195 +64,91 @@ gimp_operation_dissolve_mode_class_init (GimpOperationDissolveModeClass *klass)
                                  "categories",  "compositors",
                                  NULL);
 
-  operation_class->prepare                 = gimp_operation_dissolve_mode_prepare;
-  operation_class->get_required_for_output = gimp_operation_dissolve_mode_get_required_for_output;
-  composer_class->process                  = gimp_operation_dissolve_mode_process;
-
-  g_object_class_install_property (object_class, PROP_PREMULTIPLIED,
-                                   g_param_spec_boolean ("premultiplied",
-                                                         NULL, NULL,
-                                                         TRUE,
-                                                         GIMP_PARAM_READWRITE |
-                                                         G_PARAM_CONSTRUCT_ONLY));
+  operation_class->prepare      = gimp_operation_dissolve_mode_prepare;
+  point_composer_class->process = gimp_operation_dissolve_mode_process;
 
 #define RANDOM_SEED 314159265
 
-  /* generate a table of random seeds */
-  gr = g_rand_new_with_seed (RANDOM_SEED);
-
-  for (i = 0; i < RANDOM_TABLE_SIZE; i++)
+  if (!table_initialized)
     {
-      random_table[i] = g_rand_int (gr);
-    }
-
-  g_rand_free (gr);
-}
-
-static void
-gimp_operation_dissolve_mode_init (GimpOperationDissolveMode *self)
-{
-}
-
-static void
-gimp_operation_dissolve_mode_set_property (GObject      *object,
-                                           guint         property_id,
-                                           const GValue *value,
-                                           GParamSpec   *pspec)
-{
-  GimpOperationDissolveMode *self = GIMP_OPERATION_DISSOLVE_MODE (object);
+      /* generate a table of random seeds */
+      gr = g_rand_new_with_seed (RANDOM_SEED);
 
-  switch (property_id)
-    {
-    case PROP_PREMULTIPLIED:
-      self->premultiplied = g_value_get_boolean (value);
-      break;
+      for (i = 0; i < RANDOM_TABLE_SIZE; i++)
+        {
+          random_table[i] = g_rand_int (gr);
+        }
 
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
-      break;
+      g_rand_free (gr);
+      table_initialized = TRUE;
     }
 }
 
 static void
-gimp_operation_dissolve_mode_get_property (GObject    *object,
-                                           guint       property_id,
-                                           GValue     *value,
-                                           GParamSpec *pspec)
+gimp_operation_dissolve_mode_init (GimpOperationDissolveMode *self)
 {
-  GimpOperationDissolveMode *self = GIMP_OPERATION_DISSOLVE_MODE (object);
-
-  switch (property_id)
-    {
-    case PROP_PREMULTIPLIED:
-      g_value_set_boolean (value, self->premultiplied);
-      break;
-
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
-      break;
-    }
 }
 
 static void
 gimp_operation_dissolve_mode_prepare (GeglOperation *operation)
 {
-  GimpOperationDissolveMode *self = GIMP_OPERATION_DISSOLVE_MODE (operation);
   const Babl                *format;
 
-  if (self->premultiplied)
-    format = babl_format ("RaGaBaA float");
-  else
-    format = babl_format ("RGBA float");
+  format = babl_format ("R'G'B'A float");
 
   gegl_operation_set_format (operation, "input", format);
   gegl_operation_set_format (operation, "aux", format);
   gegl_operation_set_format (operation, "output", format);
 }
 
-static GeglRectangle
-gimp_operation_dissolve_mode_get_required_for_output (GeglOperation       *operation,
-                                                      const gchar         *input_pad,
-                                                      const GeglRectangle *roi)
-{
-  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
-                                                                  "input");
-
-  return result;
-}
-
 static gboolean
 gimp_operation_dissolve_mode_process (GeglOperation       *operation,
-                                      GeglBuffer          *input,
-                                      GeglBuffer          *aux,
-                                      GeglBuffer          *output,
+                                      void                *in_buf,
+                                      void                *aux_buf,
+                                      void                *out_buf,
+                                      glong                samples,
                                       const GeglRectangle *result,
                                       gint                 level)
 {
-  GimpOperationDissolveMode *self = GIMP_OPERATION_DISSOLVE_MODE (operation);
-  GeglBufferIterator        *it;
-  const Babl                *format;
-  gint                       index_in, index_out, index_layer;
-
-  if (self->premultiplied)
-    format = babl_format ("RaGaBaA float");
-  else
-    format = babl_format ("RGBA float");
-
-  it          = gegl_buffer_iterator_new (output, result, level,
-                                          format, GEGL_BUFFER_WRITE,
-                                          GEGL_ABYSS_NONE);
-  index_in    = gegl_buffer_iterator_add (it, input, result,
-                                          level, format, GEGL_BUFFER_READ,
-                                          GEGL_ABYSS_NONE);
-  index_layer = gegl_buffer_iterator_add (it, aux, result,
-                                          level, format, GEGL_BUFFER_READ,
-                                          GEGL_ABYSS_NONE);
-  index_out   = 0;
-
-  while (gegl_buffer_iterator_next (it))
+  gint    x, y, i;
+  gfloat *in  = in_buf;
+  gfloat *out = out_buf;
+  gfloat *aux = aux_buf;
+  
+  for (i = 0, y = result->y; y < result->y + result->height; y++)
     {
-      gint    row;
-      gint    width  = it->roi->width;
-      gint    height = it->roi->height;
-      gfloat *in     = it->data[index_in];
-      gfloat *out    = it->data[index_out];
-      gfloat *layer  = it->data[index_layer];
+      GRand *gr = g_rand_new_with_seed (random_table[y % RANDOM_TABLE_SIZE]);
 
-      for (row = 0; row < height; row++)
+      /* fast forward through this rows pseudo random sequence */
+      for (x = 0; x < result->x; x++)
+        g_rand_int (gr);
+
+      for (x = result->x; x < result->x + result->width; x++, i++)
         {
-          gint   pixel, i;
-          gint   x  = gegl_buffer_get_x (aux) + 4096 + it->roi->x;
-          gint   y  = gegl_buffer_get_y (aux) + 4096 + it->roi->y;
-          GRand *gr = g_rand_new_with_seed (random_table[(y + row) % RANDOM_TABLE_SIZE]);
+          gdouble  rand_val;
+          /* dissolve if random value is >= opacity */
+          rand_val = g_rand_int_range (gr, 0, 255);
 
-          for (i = 0; i < x; i++)
+          if (aux[3] * 255 >= rand_val)
             {
-              g_rand_double_range (gr, 0.0, 0.1);
+              out[0] = aux[0];
+              out[1] = aux[1];
+              out[2] = aux[2];
+              out[3] = 1.0;
             }
-
-          for (pixel = 0; pixel < width; pixel++)
+          else
             {
-              gdouble  rand_val;
-
-              /* dissolve if random value is >= opacity */
-              rand_val = g_rand_double_range (gr, 0.0, 1.0);
-
-              if (layer[ALPHA] >= rand_val)
-                {
-                  out[ALPHA] = 1.0;
-
-                  if (self->premultiplied)
-                    {
-                      for (i = RED; i < ALPHA; i++)
-                        {
-                          out[i] = layer[i] / layer[ALPHA];
-                        }
-                    }
-                  else
-                    {
-                      for (i = RED; i < ALPHA; i++)
-                        {
-                          out[i] = layer[i];
-                        }
-                    }
-                }
-              else
-                {
-                  out[ALPHA] = in[ALPHA];
-
-                  for (i = RED; i < ALPHA; i++)
-                    {
-                      out[i] = in[i];
-                    }
-                }
-
-              in    += 4;
-              layer += 4;
-              out   += 4;
+              out[0] = in[0];
+              out[1] = in[1];
+              out[2] = in[2];
+              out[3] = in[3];
             }
 
-          g_rand_free (gr);
+          in+=4;
+          out+=4;
+          aux+=4;
         }
+      g_rand_free (gr);
     }
 
   return TRUE;
diff --git a/app/gegl/gimpoperationdissolvemode.h b/app/gegl/gimpoperationdissolvemode.h
index ee5fe2b..ad9dbf5 100644
--- a/app/gegl/gimpoperationdissolvemode.h
+++ b/app/gegl/gimpoperationdissolvemode.h
@@ -29,19 +29,18 @@
 #define GIMP_IS_OPERATION_DISSOLVE_MODE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DISSOLVE_MODE))
 #define GIMP_OPERATION_DISSOLVE_MODE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DISSOLVE_MODE, GimpOperationDissolveModeClass))
 
+#include "gimpoperationpointlayermode.h"
 
 typedef struct _GimpOperationDissolveModeClass GimpOperationDissolveModeClass;
 
 struct _GimpOperationDissolveModeClass
 {
-  GeglOperationComposerClass parent_class;
+  GimpOperationPointLayerModeClass parent_class;
 };
 
 struct _GimpOperationDissolveMode
 {
-  GeglOperationComposer parent_instance;
-
-  gboolean              premultiplied;
+  GimpOperationPointLayerMode parent_instance;
 };
 
 



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