wxGraphicsBitmap implementation for Cairo.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@56887 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/graphicc.cpp

@@ -301,6 +301,23 @@ private :
     double m_alpha;
 };
 
+class wxCairoBitmapData : public wxGraphicsObjectRefData
+{
+public:
+    wxCairoBitmapData( wxGraphicsRenderer* renderer, const wxBitmap& bmp );
+    ~wxCairoBitmapData();
+
+    virtual cairo_surface_t* GetCairoSurface() { return m_surface; }
+    virtual cairo_pattern_t* GetCairoPattern() { return m_pattern; }
+    virtual wxSize GetSize() { return wxSize(m_width, m_height); }
+private :
+    cairo_surface_t* m_surface;
+    cairo_pattern_t* m_pattern;
+    int m_width;
+    int m_height;
+    unsigned char* m_buffer;
+};
+
 class WXDLLIMPEXP_CORE wxCairoContext : public wxGraphicsContext
 {
     DECLARE_NO_COPY_CLASS(wxCairoContext)
@@ -341,7 +358,7 @@ public:
     // gets the matrix of this context
     virtual wxGraphicsMatrix GetTransform() const;
 
-    void DrawGraphicsBitmapInternal( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) {}
+    void DrawGraphicsBitmapInternal( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
     virtual void PushState();
@@ -962,6 +979,90 @@ void * wxCairoMatrixData::GetNativeMatrix() const
     return (void*) &m_matrix;
 }
 
+//-----------------------------------------------------------------------------
+// wxCairoBitmap implementation
+//-----------------------------------------------------------------------------
+
+wxCairoBitmapData::wxCairoBitmapData( wxGraphicsRenderer* renderer, const wxBitmap& bmp ) : wxGraphicsObjectRefData( renderer )
+{
+    wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
+
+    int bw = m_width = bmp.GetWidth();
+    int bh = m_height = bmp.GetHeight();
+    wxBitmap bmpSource = bmp;  // we need a non-const instance
+    m_buffer = new unsigned char[bw*bh*4];
+    wxUint32* data = (wxUint32*)m_buffer;
+    
+    // Create a surface object and copy the bitmap pixel data to it.  if the
+    // image has alpha (or a mask represented as alpha) then we'll use a
+    // different format and iterator than if it doesn't...
+    if (bmpSource.HasAlpha() || bmpSource.GetMask())
+    {
+        m_surface = cairo_image_surface_create_for_data(
+            m_buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
+        wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
+        wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
+        
+        wxAlphaPixelData::Iterator p(pixData);
+        for (int y=0; y<bh; y++)
+        {
+            wxAlphaPixelData::Iterator rowStart = p;
+            for (int x=0; x<bw; x++)
+            {
+                // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
+                // with alpha in the upper 8 bits, then red, then green, then
+                // blue. The 32-bit quantities are stored native-endian.
+                // Pre-multiplied alpha is used.
+                unsigned char alpha = p.Alpha();
+                if (alpha == 0)
+                    *data = 0;
+                else
+                    *data = ( alpha                      << 24 
+                              | (p.Red() * alpha/255)    << 16 
+                              | (p.Green() * alpha/255)  <<  8 
+                              | (p.Blue() * alpha/255) );
+                ++data;
+                ++p;
+            }
+            p = rowStart;
+            p.OffsetY(pixData, 1);
+        }        
+    }
+    else  // no alpha
+    {
+        m_surface = cairo_image_surface_create_for_data(
+            m_buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
+        wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
+        wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
+        
+        wxNativePixelData::Iterator p(pixData);
+        for (int y=0; y<bh; y++)
+        {
+            wxNativePixelData::Iterator rowStart = p;
+            for (int x=0; x<bw; x++)
+            {
+                // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
+                // the upper 8 bits unused. Red, Green, and Blue are stored in
+                // the remaining 24 bits in that order.  The 32-bit quantities
+                // are stored native-endian.
+                *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
+                ++data;
+                ++p;
+            }
+            p = rowStart;
+            p.OffsetY(pixData, 1);
+        }        
+    }
+    m_pattern = cairo_pattern_create_for_surface(m_surface);
+}
+
+wxCairoBitmapData::~wxCairoBitmapData()
+{
+    cairo_pattern_destroy(m_pattern);
+    cairo_surface_destroy(m_surface);
+    delete [] m_buffer;
+}
+
 //-----------------------------------------------------------------------------
 // wxCairoContext implementation
 //-----------------------------------------------------------------------------
@@ -1147,103 +1248,38 @@ void wxCairoContext::PopState()
 
 void wxGraphicsContext::DrawGraphicsBitmap(const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h)
 {
+    static_cast<wxCairoContext*>(this)->DrawGraphicsBitmapInternal(bmp, x, y, w, h);
 }
 
 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {
-    wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
+    wxGraphicsBitmap bitmap = GetRenderer()->CreateBitmap(bmp);
-
+    DrawGraphicsBitmapInternal(bitmap, x, y, w, h);
-    cairo_surface_t* surface;
+}
-    int bw = bmp.GetWidth();
-    int bh = bmp.GetHeight();
-    wxBitmap bmpSource = bmp;  // we need a non-const instance
-    unsigned char* buffer = new unsigned char[bw*bh*4];
-    wxUint32* data = (wxUint32*)buffer;
-    
-    // Create a surface object and copy the bitmap pixel data to it.  if the
-    // image has alpha (or a mask represented as alpha) then we'll use a
-    // different format and iterator than if it doesn't...
-    if (bmpSource.HasAlpha() || bmpSource.GetMask())
-    {
-        surface = cairo_image_surface_create_for_data(
-            buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
-        wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
-        wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
-        
-        wxAlphaPixelData::Iterator p(pixData);
-        for (int y=0; y<bh; y++)
-        {
-            wxAlphaPixelData::Iterator rowStart = p;
-            for (int x=0; x<bw; x++)
-            {
-                // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
-                // with alpha in the upper 8 bits, then red, then green, then
-                // blue. The 32-bit quantities are stored native-endian.
-                // Pre-multiplied alpha is used.
-                unsigned char alpha = p.Alpha();
-                if (alpha == 0)
-                    *data = 0;
-                else
-                    *data = ( alpha                      << 24 
-                              | (p.Red() * alpha/255)    << 16 
-                              | (p.Green() * alpha/255)  <<  8 
-                              | (p.Blue() * alpha/255) );
-                ++data;
-                ++p;
-            }
-            p = rowStart;
-            p.OffsetY(pixData, 1);
-        }        
-    }
-    else  // no alpha
-    {
-        surface = cairo_image_surface_create_for_data(
-            buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
-        wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
-        wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
-        
-        wxNativePixelData::Iterator p(pixData);
-        for (int y=0; y<bh; y++)
-        {
-            wxNativePixelData::Iterator rowStart = p;
-            for (int x=0; x<bw; x++)
-            {
-                // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
-                // the upper 8 bits unused. Red, Green, and Blue are stored in
-                // the remaining 24 bits in that order.  The 32-bit quantities
-                // are stored native-endian.
-                *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
-                ++data;
-                ++p;
-            }
-            p = rowStart;
-            p.OffsetY(pixData, 1);
-        }        
-    }
-
 
+void wxCairoContext::DrawGraphicsBitmapInternal(const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
+{
+    wxCairoBitmapData* data = static_cast<wxCairoBitmapData*>(bmp.GetRefData());
+    cairo_pattern_t* pattern = data->GetCairoPattern();
+    wxSize size = data->GetSize();
     PushState();
     
     // In case we're scaling the image by using a width and height different
     // than the bitmap's size create a pattern transformation on the surface and
     // draw the transformed pattern.
-    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
+    wxDouble scaleX = w / size.GetWidth();
-    wxDouble scaleX = w / bw;
+    wxDouble scaleY = h / size.GetHeight();
-    wxDouble scaleY = h / bh;
     cairo_scale(m_context, scaleX, scaleY);
 
     // prepare to draw the image
     cairo_translate(m_context, x, y);
     cairo_set_source(m_context, pattern);
     // use the original size here since the context is scaled already...
-    cairo_rectangle(m_context, 0, 0, bw, bh);
+    cairo_rectangle(m_context, 0, 0, size.GetWidth(), size.GetHeight());
     // fill the rectangle using the pattern
     cairo_fill(m_context);
 
     // clean up
-    cairo_pattern_destroy(pattern);
-    cairo_surface_destroy(surface);
-    delete [] buffer;
     PopState();
 }
 
@@ -1378,7 +1414,7 @@ public :
     // sets the font
     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
     
-    wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) { return wxGraphicsBitmap(); }
+    wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) ;
 
 private :
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
@@ -1520,4 +1556,16 @@ wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour
         return wxNullGraphicsFont;
 }
 
+wxGraphicsBitmap wxGraphicsRenderer::CreateBitmap( const wxBitmap& bmp )
+{
+    if ( bmp.Ok() )
+    {
+        wxGraphicsBitmap p;
+        p.SetRefData(new wxCairoBitmapData( this , bmp ));
+        return p;
+    }
+    else
+        return wxNullGraphicsBitmap;
+}
+
 #endif  // wxUSE_GRAPHICS_CONTEXT