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switching to compositing operators (fixes #9881), adding layers

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58917 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Stefan Csomor
2009-02-15 16:52:05 +00:00
parent 977a41ec3e
commit bf02a7f976
6 changed files with 538 additions and 154 deletions
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59
include/wx/graphics.h
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@@ -20,6 +20,38 @@
#include "wx/dynarray.h"
#include "wx/dc.h"
enum wxAntialiasMode
{
wxANTIALIAS_NONE, // should be 0
wxANTIALIAS_DEFAULT,
};
enum wxCompositionMode
{
// R = Result, S = Source, D = Destination, premultiplied with alpha
// Ra, Sa, Da their alpha components
// classic Porter-Duff compositions
// http://keithp.com/~keithp/porterduff/p253-porter.pdf
wxCOMPOSITION_CLEAR, /* R = 0 */
wxCOMPOSITION_SOURCE, /* R = S */
wxCOMPOSITION_OVER, /* R = S + D*(1 - Sa) */
wxCOMPOSITION_IN, /* R = S*Da */
wxCOMPOSITION_OUT, /* R = S*(1 - Da) */
wxCOMPOSITION_ATOP, /* R = S*Da + D*(1 - Sa) */
wxCOMPOSITION_DEST, /* R = D, essentially a noop */
wxCOMPOSITION_DEST_OVER, /* R = S*(1 - Da) + D */
wxCOMPOSITION_DEST_IN, /* R = D*Sa */
wxCOMPOSITION_DEST_OUT, /* R = D*(1 - Sa) */
wxCOMPOSITION_DEST_ATOP, /* R = S*(1 - Da) + D*Sa */
wxCOMPOSITION_XOR, /* R = S*(1 - Da) + D*(1 - Sa) */
// mathematical compositions
wxCOMPOSITION_ADD, /* R = S + D */
};
class WXDLLIMPEXP_FWD_CORE wxWindowDC;
class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
#if wxUSE_PRINTING_ARCHITECTURE
@@ -356,11 +388,17 @@ public:
// returns the native context
virtual void * GetNativeContext() = 0;
// returns the current logical function
virtual wxRasterOperationMode GetLogicalFunction() const { return m_logicalFunction; }
// returns the current shape antialiasing mode
virtual wxAntialiasMode GetAntialiasMode() const { return m_antialias; }
// sets the antialiasing mode, returns true if it supported
virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
// sets the current logical function, returns true if it supported
virtual bool SetLogicalFunction(wxRasterOperationMode function);
// returns the current compositing operator
virtual wxCompositionMode GetCompositionMode() const { return m_composition; }
// sets the compositing operator, returns true if it supported
virtual bool SetCompositionMode(wxCompositionMode op) = 0;
// returns the size of the graphics context in device coordinates
virtual void GetSize( wxDouble* width, wxDouble* height);
@@ -375,6 +413,14 @@ public:
// returns the alpha on this context
virtual wxDouble GetAlpha() const;
#endif
// all rendering is done into a fully transparent temporary context
virtual void BeginLayer(wxDouble opacity) = 0;
// composites back the drawings into the content with the opacity given at
// the BeginLayer call
virtual void EndLayer() = 0;
//
// transformation : changes the current transformation matrix CTM of the context
//
@@ -477,7 +523,7 @@ public:
// draws a polygon
virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
// draws a polygon
// draws a rectangle
virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
// draws an ellipse
@@ -496,7 +542,8 @@ protected:
wxGraphicsPen m_pen;
wxGraphicsBrush m_brush;
wxGraphicsFont m_font;
wxRasterOperationMode m_logicalFunction;
wxAntialiasMode m_antialias;
wxCompositionMode m_composition;
protected:
// implementations of overloaded public functions: we use different names