From 59748c3d553ac4ab6ea9660f5c017f046ee21bbd Mon Sep 17 00:00:00 2001
From: ouv <ouv@opencascade.com>
Date: Fri, 23 Sep 2005 13:53:50 +0000
Subject: [PATCH] MakeTexture() moved from VISU_GaussPoints_I

---
 src/PIPELINE/VISU_GaussPointsPL.cxx | 60 +++++++++++++++++++++++++++++
 src/PIPELINE/VISU_GaussPointsPL.hxx |  5 +++
 2 files changed, 65 insertions(+)

diff --git a/src/PIPELINE/VISU_GaussPointsPL.cxx b/src/PIPELINE/VISU_GaussPointsPL.cxx
index 85802771..c3f68e91 100644
--- a/src/PIPELINE/VISU_GaussPointsPL.cxx
+++ b/src/PIPELINE/VISU_GaussPointsPL.cxx
@@ -367,3 +367,63 @@ VISU_GaussPointsPL
 {
   myPSMapper->SetImageData( theImageData );
 }
+
+//----------------------------------------------------------------------------
+vtkImageData*
+VISU_GaussPointsPL
+::MakeTexture( const char* theMainTexture, 
+	       const char* theAlphaTexture )
+{
+  if( !theMainTexture || !theAlphaTexture )
+    return 0;
+
+  vtkXMLImageDataReader* aMainReader = vtkXMLImageDataReader::New();
+  vtkXMLImageDataReader* anAlphaReader = vtkXMLImageDataReader::New();
+
+  aMainReader->SetFileName( theMainTexture );
+  anAlphaReader->SetFileName( theAlphaTexture );
+
+  aMainReader->Update();
+  anAlphaReader->Update();
+
+  vtkImageData* aMainImageData = aMainReader->GetOutput();
+  vtkImageData* anAlphaImageData = anAlphaReader->GetOutput();
+
+  int* aMainImageSize = aMainImageData->GetDimensions();
+  int* anAlphaImageSize = anAlphaImageData->GetDimensions();
+  if(aMainImageSize[0] != anAlphaImageSize[0] || aMainImageSize[1] != anAlphaImageSize[1])
+    throw std::runtime_error("GaussPoints_i::MakeTexture : aMainImageSize[0] != anAlphaImageSize[0] || aMainImageSize[1] != anAlphaImageSize[1]");
+
+  int aNbCompositeComponents = 4;
+  vtkImageData* aCompositeImageData = vtkImageData::New();
+  aCompositeImageData->SetDimensions(aMainImageSize);
+  aCompositeImageData->SetScalarTypeToUnsignedChar();        
+  aCompositeImageData->SetNumberOfScalarComponents(aNbCompositeComponents);
+  aCompositeImageData->AllocateScalars();
+
+  unsigned char* aMainDataPtr = (unsigned char*)aMainImageData->GetScalarPointer();
+  unsigned char* anAlphaDataPtr = (unsigned char*)anAlphaImageData->GetScalarPointer();
+  unsigned char *aCompositeDataPtr = (unsigned char * )aCompositeImageData->GetScalarPointer();
+
+  int aNbMainComponents = aMainImageData->GetNumberOfScalarComponents();
+  int aNbAlphaComponents = anAlphaImageData->GetNumberOfScalarComponents();
+  int aCompositeSize = aMainImageSize[0] * aMainImageSize[1] * aNbCompositeComponents;
+  
+  int aMainId = 0, anAlphaId = 0, aCompositeId = 0;
+  for(; aCompositeId < aCompositeSize;)
+  {
+    aCompositeDataPtr[aCompositeId] = aMainDataPtr[aMainId];
+    aCompositeDataPtr[aCompositeId + 1] = aMainDataPtr[aMainId + 1];
+    aCompositeDataPtr[aCompositeId + 2] = aMainDataPtr[aMainId + 2];
+    aCompositeDataPtr[aCompositeId + 3] = anAlphaDataPtr[anAlphaId];
+
+    aMainId += aNbMainComponents;
+    anAlphaId += aNbAlphaComponents;
+    aCompositeId += aNbCompositeComponents;
+  }
+  aMainReader->Delete();
+  anAlphaReader->Delete();
+  aCompositeImageData->Update();
+
+  return aCompositeImageData;
+}
diff --git a/src/PIPELINE/VISU_GaussPointsPL.hxx b/src/PIPELINE/VISU_GaussPointsPL.hxx
index 3d9cab66..192542ae 100644
--- a/src/PIPELINE/VISU_GaussPointsPL.hxx
+++ b/src/PIPELINE/VISU_GaussPointsPL.hxx
@@ -159,6 +159,11 @@ public:
   void
   SetImageData(vtkImageData* theImageData);
 
+  static
+  vtkImageData*
+  MakeTexture( const char* theMainTexture,
+	       const char* theAlphaTexture );
+
 protected:
   VISU_OpenGLPointSpriteMapper* myPSMapper;
   vtkGeometryFilter* myGeomFilter;
-- 
2.39.2