paysages : Preview improvements.

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@315 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

TODO

@@ -11,10 +11,10 @@ Technology Preview 2 :
 - Improve curve editor.
 - Water and terrain LOD moves with the camera, fix it like in the wanderer.
 - There should not have to be more preview threads than cpu cores.
-- Add preview threads pausing (for rendering).
-- Add preview chunks priority (for visible previews).
-- Interrupt preview chunk renderings that will be discarded at commit.
+- Pause previews drawing of main window when a dialog is opened.
+- Interrupt preview chunk renderings that will be discarded at commit, or that are no more visible.
 - Can't overwrite picture files (ILError).
+- Fix "RGB parameters out of range" on preview while moving render size fast in render tab.
 
 Technology Preview 3 :
 - Restore render progress.

gui_qt/basepreview.cpp

@@ -47,6 +47,11 @@ public:
         {
             _need_render = false;
             
+            if (!_preview->isVisible())
+            {
+                return false;
+            }
+            
             QImage pixbuf = _preview->startChunkTransaction(_xstart, _ystart, _xsize, _ysize, &revision);
 
             for (int x = 0; x < _xsize; x++)
@@ -108,7 +113,7 @@ void PreviewDrawingThread::run()
     while (_running)
     {
         _drawing_manager->performOneThreadJob();
-        QThread::usleep(50000);
+        QThread::usleep(5000);
     }
 }
 
@@ -124,7 +129,7 @@ PreviewDrawingManager::PreviewDrawingManager()
 
 void PreviewDrawingManager::startThreads()
 {
-    for (int i = 0; i < _thread_count * 3; i++)
+    for (int i = 0; i < _thread_count; i++)
     {
         PreviewDrawingThread* thread = new PreviewDrawingThread();
         _threads.append(thread);
@@ -363,6 +368,11 @@ void BasePreview::handleRedraw()
     lock_drawing->unlock();
 }
 
+void BasePreview::showEvent(QShowEvent* event)
+{
+    updateChunks();
+}
+
 void BasePreview::resizeEvent(QResizeEvent* event)
 {
     QImage* image;

gui_qt/basepreview.h

@@ -40,6 +40,7 @@ private:
     void updateScaling();
     void updateChunks();
 
+    void showEvent(QShowEvent* event);
     void resizeEvent(QResizeEvent* event);
     void paintEvent(QPaintEvent* event);