EgtGraphics 1.8b2 :

- aggiunta in interfaccia funzione GetImage.
2017-02-13 08:20:31 +00:00
parent 2cf0a63522
commit 5be1bf8dc7
7 changed files with 141 additions and 3 deletions
@@ -0,0 +1,123 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2017-2017
+//----------------------------------------------------------------------------
+// File : SceneImage.cpp         Data : 11.02.17           Versione : 1.8b2
+// Contenuto : Implementazione della gestione immagini della classe scena.
+//
+//
+//
+// Modifiche : 11.02.17 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+//--------------------------- Include ----------------------------------------
+#include "stdafx.h"
+#include "Scene.h"
+#include "\EgtDev\Include\EgtStringConverter.h"
+#include "\EgtDev\Extern\FreeImage\Include\FreeImage.h"
+
+using namespace std ;
+
+//----------------------------------------------------------------------------
+bool
+Scene::GetImage( int nShowMode, bool bShowGrid, bool bShowFrame, Color colBackTop, Color colBackBottom,
+                 int nDestWidth, int nDestHeight, const string& sFile)
+{
+  // Cerco e verifico il formato del file da scrivere a partire dall'estensione
+   FREE_IMAGE_FORMAT fif = FreeImage_GetFIFFromFilenameU( stringtoW( sFile)) ;
+   if ( fif == FIF_UNKNOWN  ||  ! FreeImage_FIFSupportsWriting( fif))
+      return false ;
+
+  // Dimensioni della vista
+   int nWidth = m_nViewportW ;
+   int nHeight = m_nViewportH ;
+   if ( nWidth == 0  ||  nHeight == 0)
+      return false ;
+
+  // Coefficienti di scalatura
+   if ( nDestWidth == 0  ||  nDestHeight == 0)
+      return false ;
+   double dCoeffW = double( nDestWidth) / nWidth ;
+   double dCoeffH = double( nDestHeight) / nHeight ;
+
+  // Alloco il buffer di lettura dei pixel della vista OpenGL ( fattore 4 perché RGBA)
+   BYTE* pBuffer = new BYTE[ 4 * nWidth * nHeight] ;
+   if ( pBuffer == nullptr)
+      return false ;
+
+  // Imposto attributi di visualizzazione
+   int nCurrShowMode = m_nShowMode ;
+   m_nShowMode = nShowMode ;
+   bool bCurrShowGrid = m_bShowGrid ;
+   m_bShowGrid = bShowGrid ;
+   bool bCurrShowFrame = m_bShowFrame ;
+   m_bShowFrame = bShowFrame ;
+   Color colCurrBackTop = m_colBackTop ;
+   Color colCurrBackBottom = m_colBackBottom ;
+   m_colBackTop = colBackTop ;
+   m_colBackBottom = colBackBottom ;
+  // Imposto zoom
+   double dCurrHalfWidth = m_dHalfWidth ;
+   double dCurrHalfHeight = m_dHalfHeight ;
+   double dCoeff = max( dCoeffW, dCoeffH) / min( dCoeffW, dCoeffH) ;
+   m_dHalfWidth *= dCoeff ;
+   m_dHalfHeight *= dCoeff ;
+
+  // Eseguo disegno sul back buffer
+   if ( ! MyDraw( false))
+      return false ;
+
+  // Ripristino attributi di visualizzazione originali
+   m_nShowMode = nCurrShowMode ;
+   m_bShowGrid = bCurrShowGrid ;
+   m_bShowFrame = bCurrShowFrame ;
+   m_colBackBottom = colCurrBackBottom ;
+   m_colBackTop = colCurrBackTop ;
+  // Ripristino zoom
+   m_dHalfWidth = dCurrHalfWidth ;
+   m_dHalfHeight = dCurrHalfHeight ;
+
+  // Leggo l'immagine nel buffer
+   glReadBuffer( GL_BACK) ;
+   glReadPixels( 0, 0, nWidth, nHeight, GL_BGRA, GL_UNSIGNED_BYTE, pBuffer) ;
+
+  // Converto al formato di FreeImage
+   FIBITMAP* pDib = FreeImage_ConvertFromRawBits( pBuffer, nWidth, nHeight, 4 * nWidth, 32,
+                                                  0x0000FF00, 0xFF000000, 0x00FF0000, false) ;
+  // converto l'immagine a 24 bit per pixel
+   FIBITMAP* pTmpDib = pDib ;
+   pDib = FreeImage_ConvertTo24Bits( pTmpDib) ;
+   FreeImage_Unload( pTmpDib) ;
+
+  // Eseguo scalatura della bitmap
+   int nLeft ; int nTop ;
+   int nRight ; int nBottom ;
+   if ( dCoeffW >= dCoeffH) {
+      nLeft = 0 ;
+      nRight = nWidth - 1 ;
+      int nDeltaH = nHeight - int( nDestHeight / dCoeffW) ;
+      nTop = nDeltaH / 2 ;
+      nBottom = nHeight - nTop ; 
+   }
+   else {
+      nTop = 0 ;
+      nBottom = nHeight ; 
+      int nDeltaW = nWidth - int( nDestWidth / dCoeffH) ;
+      nLeft = nDeltaW / 2 ;
+      nRight = nWidth - nLeft ;
+   }
+   FIBITMAP* pTmp2Dib = pDib ;
+   pDib = FreeImage_RescaleRect( pTmp2Dib, nDestWidth, nDestHeight, nLeft, nTop, nRight, nBottom, FILTER_BSPLINE) ;
+   FreeImage_Unload( pTmp2Dib) ;
+
+  // Salvataggio
+   int nFlag = 0 ;
+   bool bOk = ( FreeImage_SaveU( fif, pDib, stringtoW( sFile), nFlag) != FALSE) ;
+
+  // Libero le risorse
+   FreeImage_Unload( pDib) ;
+   delete pBuffer ;
+
+   return bOk ;
+}