# New: function imImageMergeAttributes.

8 files changed, 71 insertions, 5 deletions

diff --git a/html/en/history.html b/html/en/history.html
index 525cfe0..4ed4c30 100644
--- a/html/en/history.html
+++ b/html/en/history.html
@@ -26,8 +26,11 @@
 
 <h2>History of Changes</h2>
 <h3 dir="ltr">
-    CVS (19/Jan/2011)</h3>
+    CVS (04/Apr/2011)</h3>
 <ul dir="ltr">
+	<li dir="ltr"><span class="hist_new">New:</span><span style="color: #008000"><span
+            style="color: #000000"> 
+	function <strong>imImageMergeAttributes.</strong></span></span></li>
 	<li dir="ltr"><span style="color: #008000">
 	<span
             style="color: #000000"> 
diff --git a/include/im_attrib.h b/include/im_attrib.h
index 76302ef..f7d5b0e 100644
--- a/include/im_attrib.h
+++ b/include/im_attrib.h
@@ -45,6 +45,10 @@ public:
   void CopyFrom(const imAttribTable& table)
     { imAttribTableCopyFrom(ptable, table.ptable); }
 
+  /** Merges the contents of the given table into this table. */
+  void MergeFrom(const imAttribTable& table)
+    { imAttribTableMergeFrom(ptable, table.ptable); }
+
   /** Inserts an attribute into the table. \n 
    * If data_type is BYTE then count can be -1 to indicate a NULL terminated string.
    * Data is duplicated if not NULL, else data is initialized with zeros.
diff --git a/include/im_attrib_flat.h b/include/im_attrib_flat.h
index db6c2d8..8b5af2d 100644
--- a/include/im_attrib_flat.h
+++ b/include/im_attrib_flat.h
@@ -25,6 +25,7 @@ const void* imAttribTableGet(const imAttribTablePrivate* ptable, const char *nam
 void imAttribTableSet(imAttribTablePrivate* ptable, const char* name, int data_type, int count, const void* data);
 void imAttribTableUnSet(imAttribTablePrivate* ptable, const char *name);
 void imAttribTableCopyFrom(imAttribTablePrivate* ptable_dst, const imAttribTablePrivate* ptable_src);
+void imAttribTableMergeFrom(imAttribTablePrivate* ptable_dst, const imAttribTablePrivate* ptable_src);
 void imAttribTableForEach(const imAttribTablePrivate* ptable, void* user_data, imAttribTableCallback attrib_func);
 
 imAttribTablePrivate* imAttribArrayCreate(int hash_size);
diff --git a/include/im_image.h b/include/im_image.h
index 6c1a084..bd13c24 100644
--- a/include/im_image.h
+++ b/include/im_image.h
@@ -136,12 +136,20 @@ void imImageCopy(const imImage* src_image, imImage* dst_image);
 void imImageCopyData(const imImage* src_image, imImage* dst_image);
 
 /** Copies the image attributes from src to dst.
- * Includes the pallete when a MAP or GRAY image.
+ * Includes the pallete if defined in both images.
  *
  * \verbatim image:CopyAttributes(dst_image: imImage) [in Lua 5] \endverbatim
  * \ingroup imgclass */
 void imImageCopyAttributes(const imImage* src_image, imImage* dst_image);
 
+/** Merges the image attributes from src to dst. \n
+ * Attributes that exist in dst are not replaced. 
+ * Doens NOT include the pallete.
+ *
+ * \verbatim image:MergeAttributes(dst_image: imImage) [in Lua 5] \endverbatim
+ * \ingroup imgclass */
+void imImageMergeAttributes(const imImage* src_image, imImage* dst_image);
+
 /** Copy one image plane fom one image to another. \n
  * Images must have the same size and type.
  *
diff --git a/src/im.def b/src/im.def
index 1bbe79d..b54647d 100644
--- a/src/im.def
+++ b/src/im.def
@@ -109,6 +109,7 @@ EXPORTS
   imImageMatchSize
   imImageClear
   imImageCopyAttributes
+  imImageMergeAttributes
   imImageDestroy
   imImageGetAttributeList
   imImageReshape
diff --git a/src/im_attrib.cpp b/src/im_attrib.cpp
index 10d4599..b2809bb 100644
--- a/src/im_attrib.cpp
+++ b/src/im_attrib.cpp
@@ -2,7 +2,7 @@
  * \brief Attributes Table
  *
  * See Copyright Notice in im_lib.h
- * $Id: im_attrib.cpp,v 1.3 2009/08/22 04:31:04 scuri Exp $
+ * $Id: im_attrib.cpp,v 1.4 2011/04/04 20:42:47 scuri Exp $
  */
 
 #include <stdlib.h>
@@ -305,6 +305,20 @@ void imAttribTableCopyFrom(imAttribTablePrivate* ptable_dst, const imAttribTable
   imAttribTableForEach(ptable_src, (void*)ptable_dst, iCopyFunc);
 }
 
+static int iMergeFunc(void* user_data, int index, const char* name, int data_type, int count, const void* data)
+{                  
+  (void)index;
+  imAttribTablePrivate* ptable = (imAttribTablePrivate*)user_data;
+  if (!imAttribTableGet(ptable, name, NULL, NULL))
+    imAttribTableSet(ptable, name, data_type, count, data);
+  return 1;
+}
+
+void imAttribTableMergeFrom(imAttribTablePrivate* ptable_dst, const imAttribTablePrivate* ptable_src)
+{
+  imAttribTableForEach(ptable_src, (void*)ptable_dst, iMergeFunc);
+}
+
 static int iCopyArrayFunc(void* user_data, int index, const char* name, int data_type, int count, const void* data)
 {                  
   (void)index;
diff --git a/src/im_image.cpp b/src/im_image.cpp
index 5f865f8..712de7f 100644
--- a/src/im_image.cpp
+++ b/src/im_image.cpp
@@ -2,7 +2,7 @@
  * \brief Image Manipulation
  *
  * See Copyright Notice in im_lib.h
- * $Id: im_image.cpp,v 1.7 2010/01/17 18:18:12 scuri Exp $
+ * $Id: im_image.cpp,v 1.8 2011/04/04 20:42:47 scuri Exp $
  */
 
 #include <stdlib.h>
@@ -424,6 +424,28 @@ void imImageCopyAttributes(const imImage* src_image, imImage* dst_image)
   iAttributeTableCopy(src_image->attrib_table, dst_image->attrib_table);
 }
 
+static void iAttributeTableMerge(const void* src_attrib_table, void* dst_attrib_table)
+{
+  const imAttribTable* src_table = (const imAttribTable*)src_attrib_table;
+  imAttribTable* dst_table = (imAttribTable*)dst_attrib_table;
+  dst_table->MergeFrom(*src_table);
+}
+
+void imImageMergeAttributes(const imImage* src_image, imImage* dst_image)
+{
+  assert(src_image);
+  assert(dst_image);
+
+  if (src_image->palette && dst_image->palette &&
+      src_image->color_space == dst_image->color_space)
+  {
+    memcpy(dst_image->palette, src_image->palette, 256*sizeof(long));
+    dst_image->palette_count = src_image->palette_count;
+  }
+
+  iAttributeTableMerge(src_image->attrib_table, dst_image->attrib_table);
+}
+
 static int iAttribCB(void* user_data, int index, const char* name, int data_type, int count, const void* data)
 {
   (void)data_type;
diff --git a/src/lua5/imlua_image.c b/src/lua5/imlua_image.c
index b8bc1a8..057e757 100644
--- a/src/lua5/imlua_image.c
+++ b/src/lua5/imlua_image.c
@@ -2,7 +2,7 @@
  * \brief IM Lua 5 Binding
  *
  * See Copyright Notice in im_lib.h
- * $Id: imlua_image.c,v 1.13 2010/10/25 18:29:07 scuri Exp $
+ * $Id: imlua_image.c,v 1.14 2011/04/04 20:42:48 scuri Exp $
  */
 
 #include <string.h>
@@ -546,6 +546,18 @@ static int imluaImageCopyAttributes (lua_State *L)
 }
 
 /*****************************************************************************\
+ image:MergeAttributes(dst_image)
+\*****************************************************************************/
+static int imluaImageMergeAttributes (lua_State *L)
+{
+  imImage *src_image = imlua_checkimage(L, 1);
+  imImage *dst_image = imlua_checkimage(L, 2);
+
+  imImageMergeAttributes(src_image, dst_image);
+  return 0;
+}
+
+/*****************************************************************************\
  image:MatchSize(image2)
 \*****************************************************************************/
 static int imluaImageMatchSize (lua_State *L)
@@ -1056,6 +1068,7 @@ static const luaL_reg imimage_metalib[] = {
   {"SetPalette", imluaImageSetPalette},
   {"GetPalette", imluaImageGetPalette},
   {"CopyAttributes", imluaImageCopyAttributes},
+  {"MergeAttributes", imluaImageMergeAttributes},
   {"MatchSize", imluaImageMatchSize},
   {"MatchColor", imluaImageMatchColor},
   {"MatchDataType", imluaImageMatchDataType},