[gegl/abyss: 3/4] abyss: get down to gegl_buffer_get_pixel in the call graph with the repeat_mode parameter and implem

[Ville Sokk <villesokk src gnome org>]

commit b9ac084ba39479dae59636dd4ce8576c3dd3d2f4
Author: Michael Murà <batolettre gmail com>
Date:   Fri Sep 16 17:20:31 2011 +0200

    abyss: get down to gegl_buffer_get_pixel in the call graph with the repeat_mode parameter and implement the abyss policy here.
    
    Next and last function to be treated is gegl_buffer_iterate.

 gegl/buffer/gegl-buffer-access.c   |   69 ++++++++++++++++++++++++++++-------
 gegl/buffer/gegl-buffer-iterator.c |    6 ++-
 gegl/buffer/gegl-buffer-linear.c   |    2 +-
 gegl/buffer/gegl-buffer-private.h  |    7 ++--
 gegl/gegl-enums.h                  |    6 +++-
 operations/external/path.c         |    2 +-
 6 files changed, 70 insertions(+), 22 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer-access.c b/gegl/buffer/gegl-buffer-access.c
index 318b4d5..633f65b 100644
--- a/gegl/buffer/gegl-buffer-access.c
+++ b/gegl/buffer/gegl-buffer-access.c
@@ -107,7 +107,7 @@ gegl_buffer_pixel_set (GeglBuffer *buffer,
 #endif
 
 static gboolean
-gegl_buffer_in_abyss( GeglBuffer *buffer,
+gegl_buffer_in_abyss (GeglBuffer *buffer,
                       gint        x,
                       gint        y )
 {
@@ -196,11 +196,12 @@ gegl_buffer_set_pixel (GeglBuffer *buffer,
 }
 
 static inline void
-gegl_buffer_get_pixel (GeglBuffer *buffer,
-                       gint        x,
-                       gint        y,
-                       const Babl *format,
-                       gpointer    data)
+gegl_buffer_get_pixel (GeglBuffer     *buffer,
+                       gint            x,
+                       gint            y,
+                       const Babl     *format,
+                       gpointer        data,
+                       GeglAbyssPolicy repeat_mode)
 {
   guchar     *buf         = data;
   gint        tile_width  = buffer->tile_storage->tile_width;
@@ -224,8 +225,47 @@ gegl_buffer_get_pixel (GeglBuffer *buffer,
 
     if (gegl_buffer_in_abyss (buffer, x, y))
       { /* in abyss */
-        memset (buf, 0x00, bpx_size);
-        return;
+        const GeglRectangle *abyss;
+        switch (repeat_mode)
+        {
+          case GEGL_ABYSS_CLAMP:
+            abyss = gegl_buffer_get_abyss (buffer);
+            x = CLAMP (x, abyss->x, abyss->x+abyss->width);
+            y = CLAMP (y, abyss->y, abyss->x+abyss->height);
+            break;
+
+          case GEGL_ABYSS_LOOP:
+            abyss = gegl_buffer_get_abyss (buffer);
+            x = abyss->x + (x - abyss->x) % abyss->width;
+            y = abyss->y + (y - abyss->y) % abyss->height;
+            break;
+
+          case GEGL_ABYSS_BLACK:
+            {
+              gfloat color[4] = {0.0, 0.0, 0.0, 1.0};
+              babl_process (babl_fish (babl_format ("RGBA float"), format),
+                            color,
+                            buf,
+                            1);
+              return;
+            }
+
+          case GEGL_ABYSS_WHITE:
+            {
+              gfloat color[4] = {1.0, 1.0, 1.0, 1.0};
+              babl_process (babl_fish (babl_format ("RGBA float"),
+                                       format),
+                            color,
+                            buf,
+                            1);
+              return;
+            }
+
+          default:
+          case GEGL_ABYSS_NONE:
+            memset (buf, 0x00, bpx_size);
+            return;
+        }
       }
     else
       {
@@ -931,7 +971,8 @@ gegl_buffer_get_unlocked (GeglBuffer          *buffer,
                           const GeglRectangle *rect,
                           const Babl          *format,
                           gpointer             dest_buf,
-                          gint                 rowstride)
+                          gint                 rowstride,
+                          GeglAbyssPolicy      repeat_mode)
 {
 
   if (format == NULL)
@@ -944,7 +985,7 @@ gegl_buffer_get_unlocked (GeglBuffer          *buffer,
       rect->width == 1 &&
       rect->height == 1)  /* fast path */
     {
-      gegl_buffer_get_pixel (buffer, rect->x, rect->y, format, dest_buf);
+      gegl_buffer_get_pixel (buffer, rect->x, rect->y, format, dest_buf, repeat_mode);
       return;
     }
 #endif
@@ -1062,7 +1103,7 @@ gegl_buffer_get (GeglBuffer          *buffer,
                  GeglAbyssPolicy      repeat_mode)
 {
   g_return_if_fail (GEGL_IS_BUFFER (buffer));
-  gegl_buffer_get_unlocked (buffer, scale, rect, format, dest_buf, rowstride);
+  gegl_buffer_get_unlocked (buffer, scale, rect, format, dest_buf, rowstride, repeat_mode);
 }
 
 const GeglRectangle *
@@ -1084,14 +1125,14 @@ gegl_buffer_sample (GeglBuffer       *buffer,
                     gpointer          dest,
                     const Babl       *format,
                     GeglSamplerType   sampler_type,
-                    GeglAbyssPolicy    repeat_mode)
+                    GeglAbyssPolicy   repeat_mode)
 {
   GType desired_type;
   g_return_if_fail (GEGL_IS_BUFFER (buffer));
 
 /*#define USE_WORKING_SHORTCUT*/
 #ifdef USE_WORKING_SHORTCUT
-  gegl_buffer_get_pixel (buffer, x, y, format, dest);
+  gegl_buffer_get_pixel (buffer, x, y, format, dest, repeat_mode);
   return;
 #endif
 
@@ -1104,7 +1145,7 @@ gegl_buffer_sample (GeglBuffer       *buffer,
       sampler_type == GEGL_SAMPLER_NEAREST)
     {
       /* XXX: not thread safe */
-      gegl_buffer_get_pixel (buffer, x, y, format, dest);
+      gegl_buffer_get_pixel (buffer, x, y, format, dest, repeat_mode);
       return;
     }
   /* unset the cached sampler if it dosn't match the needs */
diff --git a/gegl/buffer/gegl-buffer-iterator.c b/gegl/buffer/gegl-buffer-iterator.c
index 191c148..ef435d9 100644
--- a/gegl/buffer/gegl-buffer-iterator.c
+++ b/gegl/buffer/gegl-buffer-iterator.c
@@ -527,7 +527,8 @@ gegl_buffer_iterator_next (GeglBufferIterator *iterator)
 
               if (i->flags[no] & GEGL_BUFFER_READ)
                 {
-                  gegl_buffer_get_unlocked (i->buffer[no], 1.0, &(i->roi[no]), i->format[no], i->buf[no], GEGL_AUTO_ROWSTRIDE);
+                  gegl_buffer_get_unlocked (i->buffer[no], 1.0, &(i->roi[no]), i->format[no], i->buf[no],
+                                            GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
                 }
 
               i->data[no]=i->buf[no];
@@ -547,7 +548,8 @@ gegl_buffer_iterator_next (GeglBufferIterator *iterator)
 
           if (i->flags[no] & GEGL_BUFFER_READ)
             {
-              gegl_buffer_get_unlocked (i->buffer[no], 1.0, &(i->roi[no]), i->format[no], i->buf[no], GEGL_AUTO_ROWSTRIDE);
+              gegl_buffer_get_unlocked (i->buffer[no], 1.0, &(i->roi[no]), i->format[no], i->buf[no],
+                                        GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
             }
           i->data[no]=i->buf[no];
 
diff --git a/gegl/buffer/gegl-buffer-linear.c b/gegl/buffer/gegl-buffer-linear.c
index 9db8e96..27970c5 100644
--- a/gegl/buffer/gegl-buffer-linear.c
+++ b/gegl/buffer/gegl-buffer-linear.c
@@ -205,7 +205,7 @@ gegl_buffer_linear_open (GeglBuffer          *buffer,
     if(rowstride)*rowstride = rs;
 
     info->buf = gegl_malloc (rs * info->extent.height);
-    gegl_buffer_get_unlocked (buffer, 1.0, &info->extent, format, info->buf, rs);
+    gegl_buffer_get_unlocked (buffer, 1.0, &info->extent, format, info->buf, rs, GEGL_ABYSS_NONE);
     return info->buf;
   }
   return NULL;
diff --git a/gegl/buffer/gegl-buffer-private.h b/gegl/buffer/gegl-buffer-private.h
index 3f6d7fb1..99829f6 100644
--- a/gegl/buffer/gegl-buffer-private.h
+++ b/gegl/buffer/gegl-buffer-private.h
@@ -46,8 +46,8 @@ struct _GeglBuffer
                                 be different from format */
 
   gint              shift_x; /* The relative offset of origins compared with */
-  gint              shift_y; /* anchestral tile_storage buffer, during            */
-                             /* construction relative to immediate source  */
+  gint              shift_y; /* anchestral tile_storage buffer, during       */
+                             /* construction relative to immediate source    */
 
   GeglRectangle     abyss;
   gboolean          abyss_tracks_extent; /* specifies whether the abyss rectangle
@@ -120,7 +120,8 @@ void              gegl_buffer_get_unlocked (GeglBuffer          *buffer,
                                             const GeglRectangle *rect,
                                             const Babl          *format,
                                             gpointer             dest_buf,
-                                            gint                 rowstride);
+                                            gint                 rowstride,
+                                            GeglAbyssPolicy      repeat_mode);
 
 GeglBuffer *
 gegl_buffer_new_ram (const GeglRectangle *extent,
diff --git a/gegl/gegl-enums.h b/gegl/gegl-enums.h
index 434dc8b..648a766 100644
--- a/gegl/gegl-enums.h
+++ b/gegl/gegl-enums.h
@@ -41,7 +41,11 @@ GType gegl_sampler_type_get_type   (void) G_GNUC_CONST;
 #define GEGL_TYPE_SAMPLER_TYPE (gegl_sampler_type_get_type())
 
 typedef enum {
-  GEGL_ABYSS_NONE
+  GEGL_ABYSS_NONE,
+  GEGL_ABYSS_CLAMP,
+  GEGL_ABYSS_LOOP,
+  GEGL_ABYSS_BLACK,
+  GEGL_ABYSS_WHITE
 } GeglAbyssPolicy;
 GType gegl_abyss_policy_get_type   (void) G_GNUC_CONST;
 #define GEGL_ABYSS_POLICY_TYPE (gegl_abyss_policy_get_type())
diff --git a/operations/external/path.c b/operations/external/path.c
index 4575139..bad2d41 100644
--- a/operations/external/path.c
+++ b/operations/external/path.c
@@ -256,7 +256,7 @@ gegl_path_stamp (GeglBuffer *buffer,
     }
   g_assert (s.buf);
 
-  gegl_buffer_get_unlocked (buffer, 1.0, &roi, s.format, s.buf, 0);
+  gegl_buffer_get_unlocked (buffer, 1.0, &roi, s.format, s.buf, 0, GEGL_ABYSS_NONE);
 
   {
     gint u, v;