From 8db8e30cb07ed8ceea2f1ccbcaa961399f5d7183 Mon Sep 17 00:00:00 2001
From: Marco Callieri mcallieri <marco.callieri@isti.cnr.it>
Date: Mon, 16 Jan 2012 18:06:27 +0000
Subject: [PATCH] added alpha masking for image weighting (still to be tested),
 commented out some problematic QWarning

---
 .../filter_img_patch_param/TexturePainter.cpp |  2 +-
 .../VisibilityCheck.cpp                       |  2 +-
 .../filter_img_patch_param/VisibleSet.cpp     | 29 +++++++++++++++++++
 .../filter_img_patch_param/VisibleSet.h       |  1 +
 .../filter_img_patch_param.cpp                |  6 ++++
 5 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/src/meshlabplugins/filter_img_patch_param/TexturePainter.cpp b/src/meshlabplugins/filter_img_patch_param/TexturePainter.cpp
index 699261f50..25148ff87 100644
--- a/src/meshlabplugins/filter_img_patch_param/TexturePainter.cpp
+++ b/src/meshlabplugins/filter_img_patch_param/TexturePainter.cpp
@@ -64,7 +64,7 @@ bool TexturePainter::init( int texSize )
                                  .AttachAndLink( fpg, &logs ) )
 
     {
-        qWarning( (std::string(__func__)+": "+logs).c_str() );
+    //    qWarning( (std::string(__func__)+": "+logs).c_str() );
         return false;
     }
 
diff --git a/src/meshlabplugins/filter_img_patch_param/VisibilityCheck.cpp b/src/meshlabplugins/filter_img_patch_param/VisibilityCheck.cpp
index 45128cac5..e1f2ec30b 100644
--- a/src/meshlabplugins/filter_img_patch_param/VisibilityCheck.cpp
+++ b/src/meshlabplugins/filter_img_patch_param/VisibilityCheck.cpp
@@ -370,7 +370,7 @@ bool VisibilityCheck_ShadowMap::initShaders()
         !fpg.CompileSrcFile( basename+"visibility_detection.frag", &logs ) ||
         !m_VisDetectionShader.Attach( vpg ).AttachAndLink( fpg, &logs )     )
     {
-        qWarning( (  std::string(__func__)+ ": "+logs).c_str() );
+       // qWarning( (  std::string(__func__)+ ": "+logs).c_str() );
         return false;
     }
 
diff --git a/src/meshlabplugins/filter_img_patch_param/VisibleSet.cpp b/src/meshlabplugins/filter_img_patch_param/VisibleSet.cpp
index 192219467..7c30a7108 100644
--- a/src/meshlabplugins/filter_img_patch_param/VisibleSet.cpp
+++ b/src/meshlabplugins/filter_img_patch_param/VisibleSet.cpp
@@ -99,5 +99,34 @@ float VisibleSet::getWeight( const RasterModel *rm, CFaceO &f )
                                    std::abs(2.0f*cam.Y()/rm->shot.Intrinsics.ViewportPx.Y()-1.0f) );
     }
 
+    if( (m_WeightMask & W_IMG_ALPHA) && weight>0.0f )
+    {
+        vcg::Point2f ppoint0 = rm->shot.Project( f.V(0)->P() );
+        vcg::Point2f ppoint1 = rm->shot.Project( f.V(0)->P() );
+        vcg::Point2f ppoint2 = rm->shot.Project( f.V(0)->P() );
+
+        float aweight = 1.0;
+        float wt;
+        QRgb pcolor;
+        
+        // vertex 0
+        pcolor = rm->currentPlane->image.pixel(ppoint0[0],rm->shot.Intrinsics.ViewportPx[1] - ppoint0[1]);
+        wt = (qAlpha(pcolor) / 255.0);
+        if(aweight > wt)
+          aweight = wt;
+        // vertex 0
+        pcolor = rm->currentPlane->image.pixel(ppoint1[0],rm->shot.Intrinsics.ViewportPx[1] - ppoint1[1]);
+        wt = (qAlpha(pcolor) / 255.0);
+        if(aweight > wt)
+          aweight = wt;
+        // vertex 0
+        pcolor = rm->currentPlane->image.pixel(ppoint2[0],rm->shot.Intrinsics.ViewportPx[1] - ppoint2[1]);
+        wt = (qAlpha(pcolor) / 255.0);
+        if(aweight > wt)
+          aweight = wt;
+
+        weight *= aweight;
+    }
+
     return weight;
 }
diff --git a/src/meshlabplugins/filter_img_patch_param/VisibleSet.h b/src/meshlabplugins/filter_img_patch_param/VisibleSet.h
index 7b8fdba67..0c22920e4 100644
--- a/src/meshlabplugins/filter_img_patch_param/VisibleSet.h
+++ b/src/meshlabplugins/filter_img_patch_param/VisibleSet.h
@@ -38,6 +38,7 @@ public:
         W_ORIENTATION   = 0x01,
         W_DISTANCE      = 0x02,
         W_IMG_BORDER    = 0x04,
+        W_IMG_ALPHA     = 0x08,
     };
 
 
diff --git a/src/meshlabplugins/filter_img_patch_param/filter_img_patch_param.cpp b/src/meshlabplugins/filter_img_patch_param/filter_img_patch_param.cpp
index f1c94146b..8113603c8 100644
--- a/src/meshlabplugins/filter_img_patch_param/filter_img_patch_param.cpp
+++ b/src/meshlabplugins/filter_img_patch_param/filter_img_patch_param.cpp
@@ -147,6 +147,10 @@ void FilterImgPatchParamPlugin::initParameterSet( QAction *act,
                                         true,
                                         "Use image border weight",
                                         "Includes a weight accounting for the distance to the image border during the computation of reference images") );
+			      par.addParam(new RichBool ( "useAlphaWeight",
+				                                false,
+				                                "use image alpha weight",
+				                                "If true, alpha channel of the image is used as additional weight. In this way it is possible to mask-out parts of the images that should not be projected on the mesh. Please note this is not a transparency effect, but just influences the weigthing between different images"));
             par.addParam( new RichBool( "cleanIsolatedTriangles",
                                         true,
                                         "Clean isolated triangles",
@@ -832,6 +836,8 @@ void FilterImgPatchParamPlugin::patchBasedTextureParameterization( RasterPatchMa
         weightMask |= VisibleSet::W_DISTANCE;
     if( par.getBool("useImgBorderWeight") )
         weightMask |= VisibleSet::W_IMG_BORDER;
+    if( par.getBool("useAlphaWeight") )
+        weightMask |= VisibleSet::W_IMG_ALPHA;
     VisibleSet *faceVis = new VisibleSet( mesh, rasterList, weightMask );
     Log( "VISIBILITY CHECK: %.3f sec.", 0.001f*t.elapsed() );