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Adding a native implementation for clearing bitmap/window contexts

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Filling a bitmap surface is filled with ARGB 0,0,0,0. This way eg buffered transparent layers can be properly cleared.
This commit is contained in:
Stefan Csomor
2017-06-25 22:48:58 +02:00
parent 40d77062b0
commit 6dfa897b4a
5 changed files with 72 additions and 28 deletions
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13
src/generic/graphicc.cpp
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@@ -98,7 +98,6 @@ using namespace std;
#ifdef __WXMAC__
#include "wx/osx/private.h"
#include <cairo-quartz.h>
#include <cairo-atsui.h>
#endif
// Helper functions for dealing with alpha pre-multiplication.
@@ -476,7 +475,8 @@ public:
virtual void StrokePath( const wxGraphicsPath& p ) wxOVERRIDE;
virtual void FillPath( const wxGraphicsPath& p , wxPolygonFillMode fillStyle = wxWINDING_RULE ) wxOVERRIDE;
virtual void ClearRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) wxOVERRIDE;
virtual void Translate( wxDouble dx , wxDouble dy ) wxOVERRIDE;
virtual void Scale( wxDouble xScale , wxDouble yScale ) wxOVERRIDE;
virtual void Rotate( wxDouble angle ) wxOVERRIDE;
@@ -2440,6 +2440,15 @@ void wxCairoContext::FillPath( const wxGraphicsPath& path , wxPolygonFillMode fi
}
}
void wxCairoContext::ClearRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
{
cairo_save(m_context);
cairo_set_operator(m_context, CAIRO_OPERATOR_CLEAR);
cairo_rectangle (m_context, x, y, w, h);
cairo_fill (m_context);
cairo_restore(m_context);
}
void wxCairoContext::Rotate( wxDouble angle )
{
cairo_rotate(m_context,angle);