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wxGraphicsBitmap implementation for Cairo.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@56887 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Kevin Ollivier
2008-11-22 04:40:08 +00:00
parent c41168ca31
commit 29c98ea876
1 changed files with 127 additions and 79 deletions
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206
src/generic/graphicc.cpp
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@@ -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 / bw;
wxDouble scaleY = h / bh;
wxDouble scaleX = w / size.GetWidth();
wxDouble scaleY = h / size.GetHeight();
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