src/Fl_Gl_Device_Plugin.cxx

   1 //
   2 // "$Id: Fl_Gl_Device_Plugin.cxx 8368 2011-02-04 23:32:53Z manolo $"
   3 //
   4 // implementation of class Fl_Gl_Device_Plugin for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems to:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 #include <config.h>
  29 #include <FL/Fl_Printer.H>
  30 #include <FL/Fl_Gl_Window.H>
  31 #include "Fl_Gl_Choice.H"
  32 #include "FL/Fl.H"
  33 #ifndef __APPLE__
  34 #include "FL/fl_draw.H"
  35 #endif
  36
  37 #if defined(__APPLE__)
  38 static void imgProviderReleaseData (void *info, const void *data, size_t size)
  39 {
  40   free((void *)data);
  41 }
  42 #endif
  43
  44 static void print_gl_window(Fl_Gl_Window *glw, int x, int y, int height)
  45 {
  46 #ifdef WIN32
  47   HDC save_gc = fl_gc;
  48   const int bytesperpixel = 3;
  49 #elif defined(__APPLE__)
  50   CGContextRef save_gc = fl_gc;
  51   const int bytesperpixel = 4;
  52 #else
  53   _XGC *save_gc = fl_gc;
  54   const int bytesperpixel = 3;
  55 #endif
  56   Fl_Surface_Device *save_surface = Fl_Surface_Device::surface();
  57   fl_gc = NULL;
  58   Fl_Display_Device::display_device()->set_current();
  59 #ifdef WIN32
  60   Fl::check();
  61   Fl_Window *win = (Fl_Window*)glw;
  62   while( win->window() ) win = win->window();
  63   win->redraw();
  64   Fl::check();
  65   glw->make_current();
  66 #else
  67   glw->make_current();
  68   glw->redraw();
  69   glFlush();
  70   Fl::check();
  71   glFinish();
  72 #endif
  73   // Read OpenGL context pixels directly.
  74   // For extra safety, save & restore OpenGL states that are changed
  75   glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  76   glPixelStorei(GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
  77   glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  78   glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  79   glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  80   // Read a block of pixels from the frame buffer
  81   int mByteWidth = glw->w() * bytesperpixel;
  82   mByteWidth = (mByteWidth + 3) & ~3;    // Align to 4 bytes
  83   uchar *baseAddress = (uchar*)malloc(mByteWidth * glw->h());
  84   glReadPixels(0, 0, glw->w(), glw->h(),
  85 #ifdef WIN32
  86                GL_RGB, GL_UNSIGNED_BYTE,
  87 #elif defined(__APPLE__)
  88                GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
  89 #else // FIXME Linux/Unix
  90                GL_RGB, GL_UNSIGNED_BYTE,
  91 #endif
  92                baseAddress);
  93   glPopClientAttrib();
  94   save_surface->set_current();
  95   fl_gc = save_gc;
  96 #if defined(__APPLE__)
  97 // kCGBitmapByteOrder32Host and CGBitmapInfo are supposed to arrive with 10.4
  98 // but some 10.4 don't have kCGBitmapByteOrder32Host, so we play a little #define game
  99 #if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
 100 #define kCGBitmapByteOrder32Host 0
 101 #define CGBitmapInfo CGImageAlphaInfo
 102 #elif ! defined(kCGBitmapByteOrder32Host)
 103 #ifdef __BIG_ENDIAN__
 104 #define kCGBitmapByteOrder32Host (4 << 12)
 105 #else    /* Little endian. */
 106 #define kCGBitmapByteOrder32Host (2 << 12)
 107 #endif
 108 #endif
 109   CGColorSpaceRef cSpace = CGColorSpaceCreateDeviceRGB();
 110   CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, mByteWidth * glw->h(), imgProviderReleaseData);
 111   CGImageRef image = CGImageCreate(glw->w(), glw->h(), 8, 8*bytesperpixel, mByteWidth, cSpace,
 112                                    (CGBitmapInfo)(kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host),
 113                                    provider, NULL, false, kCGRenderingIntentDefault);
 114   if(image == NULL) return;
 115   CGContextSaveGState(fl_gc);
 116   CGContextTranslateCTM(fl_gc, 0, height);
 117   CGContextScaleCTM(fl_gc, 1.0f, -1.0f);
 118   CGRect rect = { { x, height - y - glw->h() }, { glw->w(), glw->h() } };
 119   Fl_X::q_begin_image(rect, 0, 0, glw->w(), glw->h());
 120   CGContextDrawImage(fl_gc, rect, image);
 121   Fl_X::q_end_image();
 122   CGContextRestoreGState(fl_gc);
 123   CGImageRelease(image);
 124   CGColorSpaceRelease(cSpace);
 125   CGDataProviderRelease(provider);
 126 #else
 127   fl_draw_image(baseAddress + (glw->h() - 1) * mByteWidth, x, y , glw->w(), glw->h(), bytesperpixel, - mByteWidth);
 128   free(baseAddress);
 129 #endif // __APPLE__
 130 }
 131
 132 /**
 133  This class will make sure that OpenGL printing is available if fltk_gl
 134  was linked to the program.
 135  */
 136 class Fl_Gl_Device_Plugin : public Fl_Device_Plugin {
 137 public:
 138   Fl_Gl_Device_Plugin() : Fl_Device_Plugin(name()) { }
 139   virtual const char *name() { return "opengl.device.fltk.org"; }
 140   virtual int print(Fl_Widget *w, int x, int y, int height) {
 141     Fl_Gl_Window *glw = w->as_gl_window();
 142     if (!glw) return 0;
 143     print_gl_window(glw, x, y, height);
 144     return 1;
 145   }
 146 };
 147
 148 static Fl_Gl_Device_Plugin Gl_Device_Plugin;
 149
 150 // The purpose of this variable, used in Fl_Gl_Window.cxx, is only to force this file to be loaded
 151 // whenever Fl_Gl_Window.cxx is loaded, that is, whenever fltk_gl is.
 152 FL_EXPORT int fl_gl_load_plugin = 0;
 153
 154 //
 155 // End of "$Id: Fl_Gl_Device_Plugin.cxx 8368 2011-02-04 23:32:53Z manolo $".
 156 //