include/vcl/cairo.hxx

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  15  *   License, Version 2.0 (the "License"); you may not use this file
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <sal/config.h>
  23 #include <osl/endian.h>
  24 #include <vcl/Scanline.hxx>
  25 #include <vcl/vclptr.hxx>
  26 #include <config_features.h>
  27 #include <memory>
  28
  29 //Using formats that match cairo's formats. For android we patch cairo,
  30 //which is internal in that case, to swap the rgb components so that
  31 //cairo then matches the OpenGL GL_RGBA format so we can use it there
  32 //where we don't have GL_BGRA support.
  33 // SVP_24BIT_FORMAT is used to store 24-bit images in 3-byte pixels to conserve memory.
  34 #if defined(ANDROID) && !HAVE_FEATURE_ANDROID_LOK
  35 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb | ScanlineFormat::TopDown)
  36 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcRgba | ScanlineFormat::TopDown)
  37 #define SVP_CAIRO_BLUE 1
  38 #define SVP_CAIRO_GREEN 2
  39 #define SVP_CAIRO_RED 0
  40 #define SVP_CAIRO_ALPHA 3
  41 #elif defined OSL_BIGENDIAN
  42 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb | ScanlineFormat::TopDown)
  43 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcArgb | ScanlineFormat::TopDown)
  44 #define SVP_CAIRO_BLUE 3
  45 #define SVP_CAIRO_GREEN 2
  46 #define SVP_CAIRO_RED 1
  47 #define SVP_CAIRO_ALPHA 0
  48 #else
  49 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcBgr | ScanlineFormat::TopDown)
  50 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcBgra | ScanlineFormat::TopDown)
  51 #define SVP_CAIRO_BLUE 0
  52 #define SVP_CAIRO_GREEN 1
  53 #define SVP_CAIRO_RED 2
  54 #define SVP_CAIRO_ALPHA 3
  55 #endif
  56
  57 typedef struct _cairo_surface cairo_surface_t;
  58 typedef struct _cairo cairo_t;
  59
  60 class VirtualDevice;
  61
  62 namespace cairo {
  63
  64     typedef std::shared_ptr<cairo_surface_t> CairoSurfaceSharedPtr;
  65     typedef std::shared_ptr<cairo_t>         CairoSharedPtr;
  66     struct Surface;
  67     typedef std::shared_ptr<Surface>         SurfaceSharedPtr;
  68
  69     /** Cairo surface interface
  70
  71         For each cairo-supported platform, there's an implementation of
  72         this interface
  73      */
  74     struct Surface
  75     {
  76     public:
  77         virtual ~Surface() {}
  78
  79         // Query methods
  80         virtual CairoSharedPtr getCairo() const = 0;
  81         virtual CairoSurfaceSharedPtr getCairoSurface() const = 0;
  82         virtual SurfaceSharedPtr getSimilar(int cairo_content_type, int width, int height) const = 0;
  83
  84         /// factory for VirDev on this surface
  85         virtual VclPtr<VirtualDevice> createVirtualDevice() const = 0;
  86
  87         /// Resize the surface (possibly destroying content), only possible for X11 typically
  88         /// so on failure caller must create a new surface instead
  89         virtual bool Resize( int /*width*/, int /*height*/ ) { return false; }
  90
  91         /// Flush all pending output to surface
  92         virtual void flush() const = 0;
  93     };
  94
  95 }
  96
  97 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */