gui/qt/Qt4GlueCairo.cpp

   1 //
   2 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010,
   3 //   2011 Free Software 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 #ifdef HAVE_CONFIG_H
  21 #include "gnashconfig.h"
  22 #endif
  23
  24 #include "Qt4Gui.h"
  25 #include "Qt4GlueCairo.h"
  26 #include "Renderer.h"
  27 #include "Renderer_cairo.h"
  28 #include <QWidget>
  29 #include <QRect>
  30
  31 namespace gnash
  32 {
  33
  34 Qt4CairoGlue::Qt4CairoGlue()
  35 :
  36   _width(0),
  37   _height(0),
  38   _renderer(nullptr),
  39   _cairo_handle(nullptr),
  40   _cairo_surface(nullptr)
  41 {
  42 }
  43
  44 Qt4CairoGlue::~Qt4CairoGlue()
  45 {
  46     if (_cairo_surface)
  47         cairo_surface_destroy(_cairo_surface);
  48 }
  49
  50 bool
  51 Qt4CairoGlue::init(int /* argc */, char *** /* argv */)
  52 {
  53     return true;
  54 }
  55
  56 void
  57 Qt4CairoGlue::initBuffer(int width, int height)
  58 {
  59     if (! _drawing_area)
  60         return;
  61
  62     _width = width;
  63     _height = height;
  64
  65     cairo_format_t cairoFormat = CAIRO_FORMAT_ARGB32;
  66     QImage::Format qtFormat = QImage::Format_ARGB32;
  67     switch (_drawing_area->depth()) {
  68         case 24:
  69             cairoFormat = CAIRO_FORMAT_RGB24;
  70             qtFormat = QImage::Format_RGB32;
  71             break;
  72         case 32:
  73             cairoFormat = CAIRO_FORMAT_ARGB32;
  74             qtFormat = QImage::Format_ARGB32;
  75             break;
  76     }
  77
  78     // Cairo uses 4 bits per pixel even for 24 bit color depth
  79     int bufsize = _width * _height * 4;
  80     _offscreenbuf.reset(new unsigned char[bufsize]);
  81     _image.reset(new QImage(_offscreenbuf.get(),
  82                             _width, _height, qtFormat));
  83
  84     if (_cairo_surface)
  85         cairo_surface_destroy(_cairo_surface);
  86     if (_cairo_handle)
  87         cairo_destroy(_cairo_handle);
  88
  89     _cairo_surface = cairo_image_surface_create_for_data(
  90                         _offscreenbuf.get(), cairoFormat, _width, _height,
  91                         cairo_format_stride_for_width(cairoFormat, _width));
  92
  93     _cairo_handle = cairo_create(_cairo_surface);
  94     cairo_set_source_surface(_cairo_handle,
  95                              cairo_get_target(_cairo_handle), 0, 0);
  96     renderer::cairo::set_context(_renderer, _cairo_handle);
  97 }
  98
  99 void
 100 Qt4CairoGlue::prepDrawingArea(DrawingWidget *drawing_area)
 101 {
 102     assert(drawing_area);
 103     _drawing_area = drawing_area;
 104 }
 105
 106
 107 void
 108 Qt4CairoGlue::render()
 109 {
 110     QRect r(0, 0, _width, _height);
 111     render(r);
 112 }
 113
 114
 115 void
 116 Qt4CairoGlue::render(const QRect& updateRect)
 117 {
 118     assert(_drawing_area);
 119
 120     if (_cairo_handle) {
 121
 122         cairo_paint(_cairo_handle);
 123
 124         QPainter p(_drawing_area);
 125
 126         p.drawImage(updateRect, *_image, updateRect);
 127         p.end();
 128     }
 129 }
 130
 131 void
 132 Qt4CairoGlue::resize(int width, int height)
 133 {
 134     initBuffer(width, height);
 135 }
 136
 137
 138
 139 Renderer*
 140 Qt4CairoGlue::createRenderHandler()
 141 {
 142     _renderer = renderer::cairo::create_handler();
 143
 144     return _renderer;
 145 }
 146
 147 // end of namespace gnash
 148 }