librender/Renderer_agg.h

   1 //
   2 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
   3 //   Foundation, Inc
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19
  20 #ifndef BACKEND_RENDER_HANDLER_AGG_H
  21 #define BACKEND_RENDER_HANDLER_AGG_H
  22
  23 #include "dsodefs.h"
  24 #include "Renderer.h"
  25
  26 namespace gnash {
  27
  28 // Base class to shield GUIs from AGG's pixelformat classes
  29 class Renderer_agg_base : public Renderer
  30 {
  31 private:
  32
  33   unsigned char *_testBuffer; // buffer used by initTestBuffer() only
  34
  35 public:
  36
  37   Renderer_agg_base() : _testBuffer(0) { }
  38
  39   // virtual classes should have virtual destructors
  40   virtual ~Renderer_agg_base() {}
  41
  42   // these methods need to be accessed from outside:
  43   virtual void init_buffer(unsigned char *mem, int size, int x, int y, int rowstride)=0;
  44
  45   virtual unsigned int getBytesPerPixel() const=0;
  46
  47   unsigned int getBitsPerPixel() const { return getBytesPerPixel()*8; }
  48
  49   virtual bool initTestBuffer(unsigned width, unsigned height) {
  50     int size = width * height * getBytesPerPixel();
  51
  52     _testBuffer = static_cast<unsigned char *>( realloc(_testBuffer, size) );
  53
  54     init_buffer(_testBuffer, size, width, height, width * getBytesPerPixel());
  55
  56     return true;
  57   }
  58
  59
  60 };
  61
  62
  63 /// Create a render handler
  64 //
  65 /// If the given pixelformat is unsupported, or any other error
  66 /// occurs, NULL is returned.
  67 ///
  68 DSOEXPORT Renderer_agg_base*
  69   create_Renderer_agg(const char *pixelformat);
  70
  71 /// Detect pixel format based on bit mask. If the pixel format is unknown,
  72 /// NULL is returned. Note that a successfully detected pixel format does
  73 /// not necessarily mean that the pixel format is available (compiled in).
  74 /// The bit offsets are assumed to be in host byte order!
  75 DSOEXPORT const char* agg_detect_pixel_format(unsigned int rofs, unsigned int rsize,
  76   unsigned int gofs, unsigned int gsize,
  77   unsigned int bofs, unsigned int bsize,
  78   unsigned int bpp);
  79
  80
  81 } // namespace gnash
  82
  83
  84 #endif // BACKEND_RENDER_HANDLER_CAIRO_H