From 24e80665d8272198783cd6a634cb47a7d289fb1c Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Sun, 2 Jan 2011 17:08:25 +0000
Subject: New customdata layer callback: validate Used to validate displacement
 allocation size after face copying to match face vertex and displacement
 corners count.

---
 source/blender/blenkernel/BKE_customdata.h    |  1 +
 source/blender/blenkernel/intern/customdata.c | 34 ++++++++++++++++++++++++++-
 source/blender/editors/mesh/editmesh.c        |  1 +
 source/blender/editors/mesh/editmesh_tools.c  |  1 +
 4 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/source/blender/blenkernel/BKE_customdata.h b/source/blender/blenkernel/BKE_customdata.h
index fb079d44bb5..e9118323682 100644
--- a/source/blender/blenkernel/BKE_customdata.h
+++ b/source/blender/blenkernel/BKE_customdata.h
@@ -144,6 +144,7 @@ void CustomData_em_copy_data(const struct CustomData *source,
 void CustomData_bmesh_copy_data(const struct CustomData *source, 
 							struct CustomData *dest,void *src_block, 
 							void **dest_block);
+void CustomData_em_validate_data(struct CustomData *data, void *block, int sub_elements);
 
 /* frees data in a CustomData object
  * return 1 on success, 0 on failure
diff --git a/source/blender/blenkernel/intern/customdata.c b/source/blender/blenkernel/intern/customdata.c
index ee3477585f8..2d4e65f8f94 100644
--- a/source/blender/blenkernel/intern/customdata.c
+++ b/source/blender/blenkernel/intern/customdata.c
@@ -104,6 +104,11 @@ typedef struct LayerTypeInfo {
 
 	/* a function to determine file size */
 	size_t (*filesize)(CDataFile *cdf, void *data, int count);
+
+	/* a function to validate layer contents depending on
+	 * sub-elements count
+	 */
+	void (*validate)(void *source, int sub_elements);
 } LayerTypeInfo;
 
 static void layerCopy_mdeformvert(const void *source, void *dest,
@@ -517,6 +522,20 @@ static void layerCopy_mdisps(const void *source, void *dest, int count)
 	}
 }
 
+static void layerValidate_mdisps(void *data, int sub_elements)
+{
+	MDisps *disps = data;
+	if(disps->disps) {
+		int corners = multires_mdisp_corners(disps);
+
+		if(corners != sub_elements) {
+			MEM_freeN(disps->disps);
+			disps->totdisp = disps->totdisp / corners * sub_elements;
+			disps->disps = MEM_callocN(3*disps->totdisp*sizeof(float), "layerValidate_mdisps");
+		}
+	}
+}
+
 static void layerFree_mdisps(void *data, int count, int UNUSED(size))
 {
 	int i;
@@ -768,7 +787,8 @@ const LayerTypeInfo LAYERTYPEINFO[CD_NUMTYPES] = {
 	{sizeof(MLoopCol), "MLoopCol", 1, "Col", NULL, NULL, layerInterp_mloopcol, NULL, layerDefault_mloopcol},
 	{sizeof(float)*3*4, "", 0, NULL, NULL, NULL, NULL, NULL, NULL},
 	{sizeof(MDisps), "MDisps", 1, NULL, layerCopy_mdisps,
-	 layerFree_mdisps, layerInterp_mdisps, layerSwap_mdisps, NULL, layerRead_mdisps, layerWrite_mdisps, layerFilesize_mdisps},
+	 layerFree_mdisps, layerInterp_mdisps, layerSwap_mdisps, NULL, layerRead_mdisps, layerWrite_mdisps,
+	 layerFilesize_mdisps, layerValidate_mdisps},
 	{sizeof(MCol)*4, "MCol", 4, "WeightCol", NULL, NULL, layerInterp_mcol,
 	 layerSwap_mcol, layerDefault_mcol},
 	 {sizeof(MCol)*4, "MCol", 4, "IDCol", NULL, NULL, layerInterp_mcol,
@@ -1691,6 +1711,18 @@ void CustomData_em_copy_data(const CustomData *source, CustomData *dest,
 	}
 }
 
+void CustomData_em_validate_data(CustomData *data, void *block, int sub_elements)
+{
+	int i;
+	for(i = 0; i < data->totlayer; i++) {
+		const LayerTypeInfo *typeInfo = layerType_getInfo(data->layers[i].type);
+		char *leayer_data = (char*)block + data->layers[i].offset;
+
+		if(typeInfo->validate)
+			typeInfo->validate(leayer_data, sub_elements);
+	}
+}
+
 void *CustomData_em_get(const CustomData *data, void *block, int type)
 {
 	int layer_index;
diff --git a/source/blender/editors/mesh/editmesh.c b/source/blender/editors/mesh/editmesh.c
index 2a66e95bc77..5f7ccd1441b 100644
--- a/source/blender/editors/mesh/editmesh.c
+++ b/source/blender/editors/mesh/editmesh.c
@@ -380,6 +380,7 @@ EditFace *addfacelist(EditMesh *em, EditVert *v1, EditVert *v2, EditVert *v3, Ed
 		efa->mat_nr= example->mat_nr;
 		efa->flag= example->flag;
 		CustomData_em_copy_data(&em->fdata, &em->fdata, example->data, &efa->data);
+		CustomData_em_validate_data(&em->fdata, efa->data, efa->v4 ? 4 : 3);
 	}
 	else {
 		efa->mat_nr= em->mat_nr;
diff --git a/source/blender/editors/mesh/editmesh_tools.c b/source/blender/editors/mesh/editmesh_tools.c
index 7c3262f3747..d00b5ac6070 100644
--- a/source/blender/editors/mesh/editmesh_tools.c
+++ b/source/blender/editors/mesh/editmesh_tools.c
@@ -1519,6 +1519,7 @@ static void facecopy(EditMesh *em, EditFace *source, EditFace *target)
 	if (target->v4)
 		interp_weights_face_v3( w[3],v1, v2, v3, v4, target->v4->co);
 
+	CustomData_em_validate_data(&em->fdata, target->data, target->v4 ? 4 : 3);
 	CustomData_em_interp(&em->fdata, &source->data, NULL, (float*)w, 1, target->data);
 }
 
-- 
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