include/vcl/cairo.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  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/vclptr.hxx>
  25 #include <config_cairo_rgba.h>
  26 #include <memory>
  27
  28 // Using formats that match cairo's formats.
  29 // SVP_24BIT_FORMAT is used to store 24-bit images in 3-byte pixels to conserve memory.
  30
  31 /*
  32  For internal cairo we have the option --enable-cairo-rgba which is potentially
  33  useful for Android or Online to switch the rgb components. For Android cairo then
  34  matches the OpenGL GL_RGBA format so we can use it there where we don't have
  35  GL_BGRA support. Similarly for Online we can then use cairo's pixel data
  36  without needing to swizzle it for use as a canvas ImageData.
  37 */
  38 #if ENABLE_CAIRO_RGBA
  39 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb)
  40 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcRgba)
  41 #define SVP_CAIRO_BLUE 1
  42 #define SVP_CAIRO_GREEN 2
  43 #define SVP_CAIRO_RED 0
  44 #define SVP_CAIRO_ALPHA 3
  45 #elif defined OSL_BIGENDIAN
  46 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb)
  47 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcArgb)
  48 #define SVP_CAIRO_BLUE 3
  49 #define SVP_CAIRO_GREEN 2
  50 #define SVP_CAIRO_RED 1
  51 #define SVP_CAIRO_ALPHA 0
  52 #else
  53 #define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcBgr)
  54 #define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcBgra)
  55 #define SVP_CAIRO_BLUE 0
  56 #define SVP_CAIRO_GREEN 1
  57 #define SVP_CAIRO_RED 2
  58 #define SVP_CAIRO_ALPHA 3
  59 #endif
  60
  61 typedef struct _cairo_surface cairo_surface_t;
  62 typedef struct _cairo cairo_t;
  63
  64 class VirtualDevice;
  65
  66 namespace cairo {
  67
  68     typedef std::shared_ptr<cairo_surface_t> CairoSurfaceSharedPtr;
  69     typedef std::shared_ptr<cairo_t>         CairoSharedPtr;
  70     struct Surface;
  71     typedef std::shared_ptr<Surface>         SurfaceSharedPtr;
  72
  73     /** Cairo surface interface
  74
  75         For each cairo-supported platform, there's an implementation of
  76         this interface
  77      */
  78     struct Surface
  79     {
  80     public:
  81         virtual ~Surface() {}
  82
  83         // Query methods
  84         virtual CairoSharedPtr getCairo() const = 0;
  85         virtual CairoSurfaceSharedPtr getCairoSurface() const = 0;
  86         virtual SurfaceSharedPtr getSimilar(int cairo_content_type, int width, int height) const = 0;
  87
  88         /// factory for VirDev on this surface
  89         virtual VclPtr<VirtualDevice> createVirtualDevice() const = 0;
  90
  91         /// Resize the surface (possibly destroying content), only possible for X11 typically
  92         /// so on failure caller must create a new surface instead
  93         virtual bool Resize( int /*width*/, int /*height*/ ) { return false; }
  94
  95         /// Flush all pending output to surface
  96         virtual void flush() const = 0;
  97     };
  98
  99 }
 100
 101 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */