From 93cd7b5f714cd8213ab1d694af93e72dd011dd74 Mon Sep 17 00:00:00 2001
From: Luis Lucas <luisfrlucas@gmail.com>
Date: Sun, 25 Jan 2015 23:46:29 +0000
Subject: [PATCH] Set minimum zoom equal to window size minus 5 pixels.

---
 app/VideoSubWindow.cpp |  8 ++++----
 app/ViewArea.cpp       | 41 ++++++++++++++++++++++++++++++++++++-----
 app/ViewArea.h         |  2 +-
 3 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/app/VideoSubWindow.cpp b/app/VideoSubWindow.cpp
index 27b4934..a3ebe31 100644
--- a/app/VideoSubWindow.cpp
+++ b/app/VideoSubWindow.cpp
@@ -348,7 +348,7 @@ Void VideoSubWindow::normalSize()
   if( factor != curFactor )
   {
     Double usedScale;
-    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, QPoint() );
+    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, QPoint(), QSize() );
     adjustScrollBarByScale( usedScale, QPoint() );
   }
 }
@@ -366,7 +366,7 @@ Void VideoSubWindow::zoomToFactor( Double factor, QPoint center )
   if( factor != curFactor )
   {
     Double usedScale;
-    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, center );
+    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, center, QSize() );
     adjustScrollBarByScale( usedScale, center );
   }
 }
@@ -377,7 +377,7 @@ Void VideoSubWindow::scaleView( Double scale, QPoint center )
   if( scale != 1.0 )
   {
     Double usedScale;
-    usedScale = m_cViewArea->scaleZoomFactor( scale, center );
+    usedScale = m_cViewArea->scaleZoomFactor( scale, center, getScrollSize() );
     adjustScrollBarByScale( usedScale, center );
   }
 }
@@ -409,7 +409,7 @@ Void VideoSubWindow::scaleView( const QSize & size, QPoint center )
   if( factor != curFactor )
   {
     Double usedScale;
-    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, center );
+    usedScale = m_cViewArea->scaleZoomFactor( factor / curFactor, center, getScrollSize() );
     adjustScrollBarByScale( usedScale, center );
   }
 }
diff --git a/app/ViewArea.cpp b/app/ViewArea.cpp
index 8eb145c..954dc8c 100644
--- a/app/ViewArea.cpp
+++ b/app/ViewArea.cpp
@@ -109,12 +109,41 @@ Void ViewArea::setZoomFactor( Double f )
   update();
 }
 
-Double ViewArea::scaleZoomFactor( Double scale, QPoint center )
+Double ViewArea::scaleZoomFactor( Double scale, QPoint center, QSize minimumSize )
 {
-  Double zoomFactor;
   Double maxZoom = 100.0;
   Double minZoom = 0.01;  //( 1.0 / m_pixmap.width() );
   Double new_scale = 1.0;
+  Double zoomFactor = m_zoomFactor * scale;
+
+  if(!minimumSize.isNull())
+  {
+    Double cw = m_pixmap.width()*m_zoomFactor;
+    Double ch = m_pixmap.height()*m_zoomFactor;
+    Double fw = m_pixmap.width()*zoomFactor;
+    Double fh = m_pixmap.height()*zoomFactor;
+    Double mw = minimumSize.width();
+    Double mh = minimumSize.height();
+
+    if( (cw < mw) && (ch < mh) && (scale < 1) )
+    {
+      return new_scale;
+    }
+
+    if( (fw < mw) && (fh < mh) && (scale < 1) )
+    {
+      Double wfactor = mw/fw;
+      Double hfactor = mh/fh;
+
+      if( wfactor < hfactor )
+        scale = wfactor;
+      else
+        scale = hfactor;
+
+      zoomFactor = zoomFactor * scale;
+      scale = zoomFactor/m_zoomFactor;
+    }
+  }
 
   if( ( m_zoomFactor == minZoom ) && ( scale < 1 ) )
     return new_scale;
@@ -122,7 +151,7 @@ Double ViewArea::scaleZoomFactor( Double scale, QPoint center )
   if( ( m_zoomFactor == maxZoom ) && ( scale > 1 ) )
     return new_scale;
 
-  zoomFactor = m_zoomFactor * scale;
+
   new_scale = scale;
 
   if( zoomFactor < minZoom )
@@ -289,7 +318,7 @@ void ViewArea::resizeEvent( QResizeEvent *event )
   if( size().isEmpty() || m_pixmap.isNull() )
     return;
 
-  updateOffset();
+  updateSize();
   update();
 }
 ////////////////////////////////////////////////////////////////////////////////
@@ -567,7 +596,9 @@ void ViewArea::wheelEvent( QWheelEvent *event )
     else
       scale=0.8;
 
-    usedScale = scaleZoomFactor( scale , event->pos() );
+    QWidget *p = parentWidget();
+    QSize minimumSize = QSize( p->size().width() - 5, p->size().height() - 5 );
+    usedScale = scaleZoomFactor( scale , event->pos(), minimumSize );
     if( usedScale != 1.0 )
     {
       emit zoomFactorChanged_byWheel( usedScale, event->pos() );
diff --git a/app/ViewArea.h b/app/ViewArea.h
index 77f6868..9eec6ac 100644
--- a/app/ViewArea.h
+++ b/app/ViewArea.h
@@ -116,7 +116,7 @@ public:
   PlaYUVerStream* getInputStream();
 
   // Scale function. Return used scale value (it may change when it touches the min or max zoom value)
-  Double scaleZoomFactor(Double scale, QPoint center);
+  Double scaleZoomFactor(Double scale, QPoint center, QSize minimumSize);
 
   void setTool( eTool tool );