cairo.hxx

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#pragma once
 
#include <sal/config.h>
#include <osl/endian.h>
#include <vcl/Scanline.hxx>
#include <vcl/vclptr.hxx>
#include <config_features.h>
#include <config_cairo_rgba.h>
#include <memory>
 
// Using formats that match cairo's formats.
// SVP_24BIT_FORMAT is used to store 24-bit images in 3-byte pixels to conserve memory.
 
/*
 For internal cairo we have the option --enable-cairo-rgba which is potentially
 useful for Android or Online to switch the rgb components. For Android cairo then
 matches the OpenGL GL_RGBA format so we can use it there where we don't have
 GL_BGRA support. Similarly for Online we can then use cairo's pixel data
 without needing to swizzle it for use as a canvas ImageData.
*/
#if ENABLE_CAIRO_RGBA
#define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb | ScanlineFormat::TopDown)
#define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcRgba | ScanlineFormat::TopDown)
#define SVP_CAIRO_BLUE 1
#define SVP_CAIRO_GREEN 2
#define SVP_CAIRO_RED 0
#define SVP_CAIRO_ALPHA 3
#elif defined OSL_BIGENDIAN
#define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb | ScanlineFormat::TopDown)
#define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcArgb | ScanlineFormat::TopDown)
#define SVP_CAIRO_BLUE 3
#define SVP_CAIRO_GREEN 2
#define SVP_CAIRO_RED 1
#define SVP_CAIRO_ALPHA 0
#else
#define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcBgr | ScanlineFormat::TopDown)
#define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcBgra | ScanlineFormat::TopDown)
#define SVP_CAIRO_BLUE 0
#define SVP_CAIRO_GREEN 1
#define SVP_CAIRO_RED 2
#define SVP_CAIRO_ALPHA 3
#endif
 
typedef struct _cairo_surface cairo_surface_t;
typedef struct _cairo cairo_t;
 
class VirtualDevice;
 
namespace cairo {
 
    typedef std::shared_ptr<cairo_surface_t> CairoSurfaceSharedPtr;
    typedef std::shared_ptr<cairo_t>         CairoSharedPtr;
    struct Surface;
    typedef std::shared_ptr<Surface>         SurfaceSharedPtr;
 
    struct Surface
    {
    public:
        virtual ~Surface() {}
 
        // Query methods
        virtual CairoSharedPtr getCairo() const = 0;
        virtual CairoSurfaceSharedPtr getCairoSurface() const = 0;
        virtual SurfaceSharedPtr getSimilar(int cairo_content_type, int width, int height) const = 0;
 
        virtual VclPtr<VirtualDevice> createVirtualDevice() const = 0;
 
        virtual bool Resize( int /*width*/, int /*height*/ ) { return false; }
 
        virtual void flush() const = 0;
    };
 
}
 
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