Made GAL backends settings more consistent. Fixed grid line width in the OpenGL backend.

common/gal/cairo/cairo_gal.cpp

@@ -40,23 +40,16 @@ CAIRO_GAL::CAIRO_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
                       wxEvtHandler* aPaintListener, const wxString& aName ) :
     wxWindow( aParent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxEXPAND, aName )
 {
-    // Default values
-    fillColor   = COLOR4D( 0, 0, 0, 1 );
-    strokeColor = COLOR4D( 1, 1, 1, 1 );
-    screenSize  = VECTOR2D( aParent->GetSize() );
-
     parentWindow  = aParent;
     mouseListener = aMouseListener;
     paintListener = aPaintListener;
 
+    // Initialize the flags
     isGrouping          = false;
     isInitialized       = false;
     isDeleteSavedPixels = false;
-    zoomFactor          = 1.0;
     groupCounter        = 0;
 
-    SetSize( aParent->GetSize() );
-
     // Connecting the event handlers
     Connect( wxEVT_PAINT, wxPaintEventHandler( CAIRO_GAL::onPaint ) );
 
@@ -73,17 +66,12 @@ CAIRO_GAL::CAIRO_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
     Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
 #endif
 
-    // Initialize the cursor shape
-    SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
-    initCursor( 21 );
+    SetSize( aParent->GetSize() );
+    screenSize = VECTOR2D( aParent->GetSize() );
+    initCursor( 20 );
 
-    // Allocate memory
+    // Allocate memory for pixel storage
     allocateBitmaps();
-
-    // Set grid defaults
-    SetGridColor( COLOR4D( 0.5, 0.5, 0.5, 0.3 ) );
-    SetCoarseGrid( 10 );
-    SetGridLineWidth( 0.5 );
 }
 
 
@@ -557,10 +545,10 @@ void CAIRO_GAL::SetLayerDepth( double aLayerDepth )
     {
         storePath();
 
-//        cairo_pop_group_to_source( currentContext );
-//        cairo_paint_with_alpha( currentContext, fillColor.a );
-//
-//        cairo_push_group( currentContext );
+        cairo_pop_group_to_source( currentContext );
+        cairo_paint_with_alpha( currentContext, fillColor.a );
+
+        cairo_push_group( currentContext );
     }
 }
 

common/gal/graphics_abstraction_layer.cpp

@@ -38,15 +38,21 @@ GAL::GAL() :
     // Set the default values for the internal variables
     SetIsFill( false );
     SetIsStroke( true );
-    SetIsCursorEnabled( false );
-    SetZoomFactor( 1.0 );
     SetFillColor( COLOR4D( 0.0, 0.0, 0.0, 0.0 ) );
     SetStrokeColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
-    SetGridVisibility( true );
-    SetGridColor( COLOR4D( 1, 1, 1, 0.1 ) );
-    SetCoarseGrid( 5 );
-    SetLineWidth( 1.0 );
+    SetIsCursorEnabled( false );
+    SetZoomFactor( 1.0 );
     SetDepthRange( VECTOR2D( -2048, 2047 ) );
+    SetLineWidth( 1.0 );
+
+    // Set grid defaults
+    SetGridVisibility( true );
+    SetGridColor( COLOR4D( 0.4, 0.4, 0.4, 1.0 ) );
+    SetCoarseGrid( 10 );
+    SetGridLineWidth( 0.5 );
+
+    // Initialize the cursor shape
+    SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
 
     strokeFont.LoadNewStrokeFont( newstroke_font, newstroke_font_bufsize );
 }
@@ -65,22 +71,42 @@ void GAL::DrawGrid()
     SetTarget( TARGET_NONCACHED );
 
     // The grid consists of lines
-    // For the drawing the start points, end points and increments have to be calculated in world coordinates
-    VECTOR2D    screenStartPoint( 0, 0 );
-    VECTOR2D    screenEndPoint( screenSize.x, screenSize.y );
+    // For the drawing the start points, end points and increments have
+    // to be calculated in world coordinates
     MATRIX3x3D  inverseMatrix   = worldScreenMatrix.Inverse();
-    VECTOR2D    worldStartPoint = inverseMatrix * screenStartPoint;
-    VECTOR2D    worldEndPoint   = inverseMatrix * screenEndPoint;
+    VECTOR2D    worldStartPoint = inverseMatrix * VECTOR2D( 0.0, 0.0 );
+    VECTOR2D    worldEndPoint   = inverseMatrix * screenSize;
+
+    int gridScreenSizeDense  = round( gridSize.x * worldScale );
+    int gridScreenSizeCoarse = round( gridSize.x * static_cast<double>( gridTick ) * worldScale );
+
+    // Compute the line width of the grid
+    double width = 2.0 * gridLineWidth / worldScale;
+    double doubleWidth = 2.0 * width;
+
+    SetIsFill( false );
+    SetIsStroke( true );
+
+    // Draw the origin marker
+    SetLayerDepth( 0.0 );
+    double origSize = static_cast<double>( gridOriginMarkerSize ) / worldScale;
+    SetStrokeColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
+    SetLineWidth( width );
+    DrawLine( gridOrigin + VECTOR2D( -origSize, -origSize ),
+              gridOrigin + VECTOR2D( origSize, origSize ) );
+    DrawLine( gridOrigin + VECTOR2D( -origSize, origSize ),
+              gridOrigin + VECTOR2D( origSize, -origSize ) );
+    DrawCircle( gridOrigin, origSize * 0.7 );
 
+    // Check if the grid would not be too dense
+    if( std::max( gridScreenSizeDense, gridScreenSizeCoarse ) > gridDrawThreshold )
+    {
         // Compute grid variables
         int gridStartX = round( worldStartPoint.x / gridSize.x );
         int gridEndX = round( worldEndPoint.x / gridSize.x );
         int gridStartY = round( worldStartPoint.y / gridSize.y );
         int gridEndY = round( worldEndPoint.y / gridSize.y );
 
-    int gridScreenSizeDense  = round( gridSize.x * worldScale );
-    int gridScreenSizeCoarse = round( gridSize.x * (double) gridTick * worldScale );
-
         // Swap the coordinates, if they have not the right order
         SWAP( gridEndX, <, gridStartX );
         SWAP( gridEndY, <, gridStartY );
@@ -91,31 +117,10 @@ void GAL::DrawGrid()
         gridEndX    += 1;
         gridEndY    += 1;
 
-    double  savedLineWidth  = GetLineWidth();
-    COLOR4D savedColor      = GetStrokeColor();
-
-    // Compute the line width of the grid
-    ComputeWorldScale();
-    double  width = gridLineWidth / worldScale;
-    double  doubleWidth = 2 * width;
-
-    SetLayerDepth( 0.0 );
-
-    // Draw the origin marker
-    double origSize = (double) gridOriginMarkerSize / worldScale;
-    SetStrokeColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
-    SetLineWidth( width );
-    SetIsFill( false );
-    DrawLine( gridOrigin + VECTOR2D( -origSize, -origSize ), gridOrigin + VECTOR2D( origSize, origSize ) );
-    DrawLine( gridOrigin + VECTOR2D( -origSize, origSize ),  gridOrigin + VECTOR2D( origSize, -origSize ) );
-    DrawCircle( gridOrigin, origSize * 0.7 );
-
+        // Draw the grid behind all layers
+        SetLayerDepth( depthRange.y * 0.75 );
         SetStrokeColor( gridColor );
 
-    if( std::max( gridScreenSizeDense, gridScreenSizeCoarse ) < gridDrawThreshold )
-        return;
-
-    SetLayerDepth( 0.0 );
         // Now draw the grid, every coarse grid line gets the double width
         for( int j = gridStartY; j < gridEndY; j += 1 )
         {
@@ -154,10 +159,7 @@ void GAL::DrawGrid()
                               VECTOR2D( i * gridSize.x, gridEndY * gridSize.y ) );
             }
         }
-
-    // Restore old values
-    SetLineWidth( savedLineWidth );
-    SetStrokeColor( savedColor );
+    }
 }
 
 

common/gal/opengl/opengl_compositor.cpp

@@ -143,13 +143,18 @@ void OPENGL_COMPOSITOR::SetBuffer( unsigned int aBufferHandle )
         return;
 
     // Change the rendering destination to the selected attachment point
-    if( m_currentFbo != m_framebuffer )
+    if( aBufferHandle == 0 )
+    {
+        glBindFramebuffer( GL_FRAMEBUFFER, 0 );
+        m_currentFbo = 0;
+    }
+    else if( m_currentFbo != m_framebuffer )
     {
         glBindFramebuffer( GL_FRAMEBUFFER, m_framebuffer );
         m_currentFbo = m_framebuffer;
     }
 
-    if( m_current != aBufferHandle - 1 )
+    if( m_currentFbo != 0 && m_current != aBufferHandle - 1 )
     {
         m_current = aBufferHandle - 1;
         glDrawBuffer( m_buffers[m_current].attachmentPoint );

common/gal/opengl/opengl_gal.cpp

@@ -63,29 +63,14 @@ OPENGL_GAL::OPENGL_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
     mouseListener   = aMouseListener;
     paintListener   = aPaintListener;
 
-    // Set the cursor size
-    initCursor( 20 );
-    SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
-
     // Initialize the flags
     isGlewInitialized        = false;
     isFramebufferInitialized = false;
     isShaderInitialized      = false;
     isGrouping               = false;
-    wxSize parentSize        = aParent->GetSize();
     groupCounter             = 0;
 
-    SetSize( parentSize );
-
-    screenSize.x = parentSize.x;
-    screenSize.y = parentSize.y;
-
-    // Set grid defaults
-    SetGridColor( COLOR4D( 0.3, 0.3, 0.3, 0.3 ) );
-    SetCoarseGrid( 10 );
-    SetGridLineWidth( 1.0 );
-
-    // Connecting the event handlers.
+    // Connecting the event handlers
     Connect( wxEVT_PAINT, wxPaintEventHandler( OPENGL_GAL::onPaint ) );
 
     // Mouse events are skipped to the parent
@@ -101,6 +86,10 @@ OPENGL_GAL::OPENGL_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
     Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
 #endif
 
+    SetSize( aParent->GetSize() );
+    screenSize = VECTOR2D( aParent->GetSize() );
+    initCursor( 20 );
+
     // Tesselator initialization
     tesselator = gluNewTess();
     InitTesselatorCallbacks( tesselator );
@@ -308,6 +297,12 @@ void OPENGL_GAL::BeginDrawing()
     SetStrokeColor( strokeColor );
 
     // Prepare buffers for drawing
+    compositor.SetBuffer( mainBuffer );
+    compositor.ClearBuffer();
+    compositor.SetBuffer( overlayBuffer );
+    compositor.ClearBuffer();
+    compositor.SetBuffer( 0 );  // Unbind buffers
+
     nonCachedManager.Clear();
     overlayManager.Clear();
 
@@ -321,13 +316,11 @@ void OPENGL_GAL::EndDrawing()
 {
     // Cached & non-cached containers are rendered to the same buffer
     compositor.SetBuffer( mainBuffer );
-    compositor.ClearBuffer();
     nonCachedManager.EndDrawing();
     cachedManager.EndDrawing();
 
     // Overlay container is rendered to a different buffer
     compositor.SetBuffer( overlayBuffer );
-    compositor.ClearBuffer();
     overlayManager.EndDrawing();
 
     // Draw the remaining contents, blit the rendering targets to the screen, swap the buffers
@@ -349,11 +342,9 @@ inline void OPENGL_GAL::drawLineQuad( const VECTOR2D& aStartPoint, const VECTOR2
     if( lineLength <= 0.0 )
         return;
 
-    VECTOR2D perpendicularVector( -startEndVector.y * scale, startEndVector.x * scale );
-    glm::vec4 vector( perpendicularVector.x, perpendicularVector.y, 0.0, 0.0 );
-
     // The perpendicular vector also needs transformations
-    vector = currentManager->GetTransformation() * vector;
+    glm::vec4 vector = currentManager->GetTransformation() *
+            glm::vec4( -startEndVector.y * scale, startEndVector.x * scale, 0.0, 0.0 );
 
     // Line width is maintained by the vertex shader
     currentManager->Shader( SHADER_LINE, vector.x, vector.y, lineWidth );
@@ -1151,39 +1142,26 @@ void OPENGL_GAL::DrawCursor( VECTOR2D aCursorPosition )
 
 void OPENGL_GAL::DrawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
 {
-    // TODO change to simple drawline
-    // We check, if we got a horizontal or a vertical grid line and compute the offset
-    VECTOR2D perpendicularVector;
+    compositor.SetBuffer( mainBuffer );
 
-    if( aStartPoint.x == aEndPoint.x )
+    // We do not need a very precise comparison here (the lineWidth is set by GAL::DrawGrid())
+    if( fabs( lineWidth - 2.0 * gridLineWidth / worldScale ) < 0.1 )
     {
-        // Vertical grid line
-        perpendicularVector = VECTOR2D( 0.5 * lineWidth, 0 );
+        glLineWidth( 1.0 );
     }
     else
     {
-        // Horizontal grid line
-        perpendicularVector = VECTOR2D( 0, 0.5 * lineWidth );
+        glLineWidth( 2.0 );
     }
 
-    // Now we compute the edge points of the quad
-    VECTOR2D point1 = aStartPoint + perpendicularVector;
-    VECTOR2D point2 = aStartPoint - perpendicularVector;
-    VECTOR2D point3 = aEndPoint + perpendicularVector;
-    VECTOR2D point4 = aEndPoint - perpendicularVector;
-
-    currentManager->Color( gridColor.r, gridColor.g, gridColor.b, gridColor.a );
-    currentManager->Shader( SHADER_NONE );
+    glColor4d( gridColor.r, gridColor.g, gridColor.b, gridColor.a );
 
-    // Draw the quad for the grid line
-    double gridDepth = depthRange.y * 0.75;
-    currentManager->Vertex( point1.x, point1.y, gridDepth );
-    currentManager->Vertex( point2.x, point2.y, gridDepth );
-    currentManager->Vertex( point4.x, point4.y, gridDepth );
+    glBegin( GL_LINES );
+    glVertex3d( aStartPoint.x, aStartPoint.y, layerDepth );
+    glVertex3d( aEndPoint.x, aEndPoint.y, layerDepth );
+    glEnd();
 
-    currentManager->Vertex( point1.x, point1.y, gridDepth );
-    currentManager->Vertex( point4.x, point4.y, gridDepth );
-    currentManager->Vertex( point3.x, point3.y, gridDepth );
+    glColor4d( 1.0, 1.0, 1.0, 1.0 );
 }
 
 

common/gal/opengl/shader.vert

@@ -51,7 +51,7 @@ void main()
      
         // Make lines appear to be at least 1 pixel wide
         if( worldScale * lineWidth < MIN_WIDTH )
-            scale = 1.0f / ( worldScale * lineWidth );
+            scale = MIN_WIDTH / ( worldScale * lineWidth );
         else
             scale = 1.0f;
         

include/gal/cairo/cairo_gal.h

@@ -389,12 +389,8 @@ private:
      */
     void skipMouseEvent( wxMouseEvent& aEvent );
 
-    /**
-     * @brief Initialize the cursor.
-     *
-     * @param aCursorSize is the size of the cursor.
-     */
-    void initCursor( int aCursorSize );
+    /// @copydoc GAL::initCursor()
+    virtual void initCursor( int aCursorSize );
 
     /// Allocate the bitmaps for drawing
     void allocateBitmaps();

include/gal/graphics_abstraction_layer.h

@@ -785,6 +785,13 @@ protected:
      * @param aEndPoint is the end point of the line.
      */
     virtual void DrawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) = 0;
+
+    /**
+     * @brief Initialize the cursor.
+     *
+     * @param aCursorSize is the size of the cursor.
+     */
+    virtual void initCursor( int aCursorSize ) = 0;
 };
 } // namespace KiGfx
 

include/gal/opengl/opengl_gal.h

@@ -422,12 +422,8 @@ private:
     /// Initialize GLEW.
     void initGlew();
 
-    /**
-     * @brief Initialize the cursor.
-     *
-     * @param aCursorSize is the cursor size in pixels (screen coordinates).
-     */
-    void initCursor( int aCursorSize );
+    /// @copydoc GAL::initCursor()
+    virtual void initCursor( int aCursorSize );
 
     /**
      * @brief Draw a quad for the line.