kicad/common/gal/graphics_abstraction_layer.cpp

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Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2012-2017 Kicad Developers, see change_log.txt for contributors.
Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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*
* Graphics Abstraction Layer (GAL) - base class
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <wx/log.h>
#include <gal/graphics_abstraction_layer.h>
#include <gal/definitions.h>
#include <math/util.h> // for KiROUND
#include <cmath>
using namespace KIGFX;
Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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GAL::GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions ) :
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m_options( aDisplayOptions ),
m_strokeFont( this )
Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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{
// Set the default values for the internal variables
SetIsFill( false );
SetIsStroke( true );
SetFillColor( COLOR4D( 0.0, 0.0, 0.0, 0.0 ) );
SetStrokeColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
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SetLookAtPoint( VECTOR2D( 0, 0 ) );
SetZoomFactor( 1.0 );
SetRotation( 0.0 );
// this value for SetWorldUnitLength is only suitable for Pcbnew.
// Other editors/viewer must call SetWorldUnitLength with their internal units
SetWorldUnitLength( 1e-9 /* 1 nm */ / 0.0254 /* 1 inch in meters */ );
// wxDC::GetPPI() reports 96 DPI, but somehow this value
// is the closest match to the legacy renderer
SetScreenDPI( 91 );
SetDepthRange( VECTOR2D( GAL::MIN_DEPTH, GAL::MAX_DEPTH ) );
SetLayerDepth( 0.0 );
SetFlip( false, false );
SetLineWidth( 1.0f );
computeWorldScale();
SetAxesEnabled( false );
// Set grid defaults
SetGridVisibility( true );
SetCoarseGrid( 10 );
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m_gridLineWidth = 0.5f;
m_gridStyle = GRID_STYLE::LINES;
m_gridMinSpacing = 10;
// Initialize the cursor shape
SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
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m_fullscreenCursor = false;
m_forceDisplayCursor = false;
SetCursorEnabled( false );
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// Initialize the native widget to an arrow cursor
SetNativeCursorStyle( KICURSOR::ARROW );
// Initialize text properties
ResetTextAttributes();
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m_strokeFont.LoadNewStrokeFont( newstroke_font, newstroke_font_bufsize );
// subscribe for settings updates
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m_observerLink = m_options.Subscribe( this );
Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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}
GAL::~GAL()
{
}
void GAL::OnGalDisplayOptionsChanged( const GAL_DISPLAY_OPTIONS& aOptions )
{
// defer to the child class first
updatedGalDisplayOptions( aOptions );
// there is no refresh to do at this level
}
bool GAL::updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions )
{
bool refresh = false;
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if( m_options.m_gridStyle != m_gridStyle )
{
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m_gridStyle = m_options.m_gridStyle ;
refresh = true;
}
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if( m_options.m_gridLineWidth != m_gridLineWidth )
{
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m_gridLineWidth = std::floor( m_options.m_gridLineWidth + 0.5 );
refresh = true;
}
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if( m_options.m_gridMinSpacing != m_gridMinSpacing )
{
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m_gridMinSpacing = m_options.m_gridMinSpacing;
refresh = true;
}
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if( m_options.m_axesEnabled != m_axesEnabled )
{
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m_axesEnabled = m_options.m_axesEnabled;
refresh = true;
}
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if( m_options.m_forceDisplayCursor != m_forceDisplayCursor )
{
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m_forceDisplayCursor = m_options.m_forceDisplayCursor;
refresh = true;
}
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if( m_options.m_fullscreenCursor != m_fullscreenCursor )
{
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m_fullscreenCursor = m_options.m_fullscreenCursor;
refresh = true;
}
// tell the derived class if the base class needs an update or not
return refresh;
}
Introduction of Graphics Abstraction Layer based rendering for pcbnew. New classes: - VIEW - represents view that is seen by user, takes care of layer ordering & visibility and how it is displayed (which location, how much zoomed, etc.) - VIEW_ITEM - Base class for every item that can be displayed on VIEW (the biggest change is that now it may be necessary to override ViewBBox & ViewGetLayers method for derived classes). - EDA_DRAW_PANEL_GAL - Inherits after EDA_DRAW_PANEL, displays VIEW output, right now it is not editable (in opposite to usual EDA_DRAW_PANEL). - GAL/OPENGL_GAL/CAIRO_GAL - Base Graphics Abstraction Layer class + two different flavours (Cairo is not fully supported yet), that offers methods to draw primitives using different libraries. - WX_VIEW_CONTROLS - Controller for VIEW, handles user events, allows zooming, panning, etc. - PAINTER/PCB_PAINTER - Classes that uses GAL interface to draw items (as you may have already guessed - PCB_PAINTER is a class for drawing PCB specific object, PAINTER is an abstract class). Its methods are invoked by VIEW, when an item has to be drawn. To display a new type of item - you need to implement draw(ITEM_TYPE*) method that draws it using GAL methods. - STROKE_FONT - Implements stroke font drawing using GAL methods. Most important changes to Kicad original code: * EDA_ITEM now inherits from VIEW_ITEM, which is a base class for all drawable objects. * EDA_DRAW_FRAME contains both usual EDA_DRAW_PANEL and new EDA_DRAW_PANEL_GAL, that can be switched anytime. * There are some new layers for displaying multilayer pads, vias & pads holes (these are not shown yet on the right sidebar in pcbnew) * Display order of layers is different than in previous versions (if you are curious - you may check m_galLayerOrder@pcbnew/basepcbframe.cpp). Preserving usual order would result in not very natural display, such as showing silkscreen texts on the bottom. * Introduced new hotkey (Alt+F12) and new menu option (View->Switch canvas) for switching canvas during runtime. * Some of classes (mostly derived from BOARD_ITEM) now includes ViewBBox & ViewGetLayers methods. * Removed tools/class_painter.h, as now it is extended and included in source code. Build changes: * GAL-based rendering option is turned on by a new compilation CMake option KICAD_GAL. * When compiling with CMake option KICAD_GAL=ON, GLEW and Cairo libraries are required. * GAL-related code is compiled into a static library (common/libgal). * Build with KICAD_GAL=OFF should not need any new libraries and should come out as a standard version of Kicad Currently most of items in pcbnew can be displayed using OpenGL (to be done are DIMENSIONS and MARKERS). More details about GAL can be found in: http://www.ohwr.org/attachments/1884/view-spec.pdf
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void GAL::SetTextAttributes( const EDA_TEXT* aText )
{
SetGlyphSize( VECTOR2D( aText->GetTextSize() ) );
SetHorizontalJustify( aText->GetHorizJustify() );
SetVerticalJustify( aText->GetVertJustify() );
SetFontBold( aText->IsBold() );
SetFontItalic( aText->IsItalic() );
SetFontUnderlined( false );
SetTextMirrored( aText->IsMirrored() );
}
void GAL::ResetTextAttributes()
{
// Tiny but non-zero - this will always need setting
// there is no built-in default
SetGlyphSize( { 1.0, 1.0 } );
SetHorizontalJustify( GR_TEXT_HJUSTIFY_CENTER );
SetVerticalJustify( GR_TEXT_VJUSTIFY_CENTER );
SetFontBold( false );
SetFontItalic( false );
SetFontUnderlined( false );
SetTextMirrored( false );
}
VECTOR2D GAL::GetTextLineSize( const UTF8& aText ) const
{
// Compute the X and Y size of a given text.
// Because computeTextLineSize expects a one line text,
// aText is expected to be only one line text.
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return m_strokeFont.computeTextLineSize( aText );
}
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void GAL::ComputeWorldScreenMatrix()
{
computeWorldScale();
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MATRIX3x3D translation;
translation.SetIdentity();
// We're deliberately dividing integers to avoid fractional pixel offsets.
translation.SetTranslation( VECTOR2D( m_screenSize.x/2, m_screenSize.y/2 ) );
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MATRIX3x3D rotate;
rotate.SetIdentity();
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rotate.SetRotation( m_rotation );
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MATRIX3x3D scale;
scale.SetIdentity();
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scale.SetScale( VECTOR2D( m_worldScale, m_worldScale ) );
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MATRIX3x3D flip;
flip.SetIdentity();
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flip.SetScale( VECTOR2D( m_globalFlipX ? -1.0 : 1.0, m_globalFlipY ? -1.0 : 1.0 ) );
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MATRIX3x3D lookat;
lookat.SetIdentity();
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lookat.SetTranslation( -m_lookAtPoint );
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m_worldScreenMatrix = translation * rotate * flip * scale * lookat;
m_screenWorldMatrix = m_worldScreenMatrix.Inverse();
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}
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BOX2D GAL::GetVisibleWorldExtents() const
{
const MATRIX3x3D& matrix = GetScreenWorldMatrix();
VECTOR2D halfSize = VECTOR2D( matrix.GetScale().x * m_screenSize.x * 0.5,
matrix.GetScale().y * m_screenSize.y * 0.5 );
BOX2D extents;
extents.SetOrigin( GetLookAtPoint() - halfSize );
extents.SetSize( halfSize * 2 );
return extents;
}
double GAL::computeMinGridSpacing() const
{
// just return the current value. This could be cleverer and take
// into account other settings in future
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return m_gridMinSpacing;
}
VECTOR2D GAL::GetGridPoint( const VECTOR2D& aPoint ) const
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{
#if 0
// This old code expects a non zero grid size, which can be wrong here.
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return VECTOR2D( KiROUND( ( aPoint.x - m_gridOffset.x ) / m_gridSize.x ) * m_gridSize.x + m_gridOffset.x,
KiROUND( ( aPoint.y - m_gridOffset.y ) / m_gridSize.y ) * m_gridSize.y + m_gridOffset.y );
#else
// if grid size == 0.0 there is no grid, so use aPoint as grid reference position
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double cx = m_gridSize.x > 0.0 ? KiROUND( ( aPoint.x - m_gridOffset.x ) / m_gridSize.x ) * m_gridSize.x + m_gridOffset.x
: aPoint.x;
double cy = m_gridSize.y > 0.0 ? KiROUND( ( aPoint.y - m_gridOffset.y ) / m_gridSize.y ) * m_gridSize.y + m_gridOffset.y
: aPoint.y;
return VECTOR2D( cx, cy );
#endif
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}
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const int GAL::MIN_DEPTH = -1024;
const int GAL::MAX_DEPTH = 1023;
const int GAL::GRID_DEPTH = MAX_DEPTH - 1;
COLOR4D GAL::getCursorColor() const
{
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COLOR4D color = m_cursorColor;
// dim the cursor if it's only on because it was forced
// (this helps to provide a hint for active tools)
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if( !m_isCursorEnabled )
color.a = color.a * 0.5;
return color;
}
bool GAL::SetNativeCursorStyle( KICURSOR aCursor )
{
if( m_currentNativeCursor == aCursor )
return false;
m_currentNativeCursor = aCursor;
return true;
}