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//
// "$Id$"
//
// implementation of class Fl_Gl_Device_Plugin for the Fast Light Tool Kit (FLTK).
//
// Copyright 2010-2014 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems to:
//
// http://www.fltk.org/str.php
//
#include <config.h>
#include <FL/Fl_Printer.H>
#include <FL/Fl_Gl_Window.H>
#include "Fl_Gl_Choice.H"
#include <FL/Fl_RGB_Image.H>
#include "FL/Fl.H"
#if defined(__APPLE__)
uchar *convert_BGRA_to_RGB(uchar *baseAddress, int w, int h, int mByteWidth)
{
uchar *newimg = new uchar[3*w*h];
uchar *to = newimg;
for (int i = 0; i < h; i++) {
uchar *from = baseAddress + i * mByteWidth;
for (int j = 0; j < w; j++, from += 4) {
#if __ppc__
memcpy(to, from + 1, 3);
to += 3;
#else
*(to++) = *(from+2);
*(to++) = *(from+1);
*(to++) = *from;
#endif
}
}
delete[] baseAddress;
return newimg;
}
#endif
static Fl_RGB_Image* capture_gl_rectangle(Fl_Gl_Window *glw, int x, int y, int w, int h)
/* captures a rectangle of a Fl_Gl_Window window, and returns it as a RGB image
stored from bottom to top.
*/
{
#if defined(__APPLE__)
const int bytesperpixel = 4;
#else
const int bytesperpixel = 3;
#endif
glw->flush(); // forces a GL redraw necessary for the glpuzzle demo
// Read OpenGL context pixels directly.
// For extra safety, save & restore OpenGL states that are changed
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
// Read a block of pixels from the frame buffer
int mByteWidth = w * bytesperpixel;
mByteWidth = (mByteWidth + 3) & ~3; // Align to 4 bytes
uchar *baseAddress = new uchar[mByteWidth * h];
glReadPixels(x, glw->h() - (y+h), w, h,
#if defined(__APPLE__)
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
#else
GL_RGB, GL_UNSIGNED_BYTE,
#endif
baseAddress);
glPopClientAttrib();
#if defined(__APPLE__)
baseAddress = convert_BGRA_to_RGB(baseAddress, w, h, mByteWidth);
mByteWidth = 3 * w;
#endif
Fl_RGB_Image *img = new Fl_RGB_Image(baseAddress, w, h, 3, mByteWidth);
img->alloc_array = 1;
return img;
}
/**
This class will make sure that OpenGL printing/screen capture is available if fltk_gl
was linked to the program
*/
class Fl_Gl_Device_Plugin : public Fl_Device_Plugin {
public:
Fl_Gl_Device_Plugin() : Fl_Device_Plugin(name()) { }
virtual const char *name() { return "opengl.device.fltk.org"; }
virtual int print(Fl_Widget *w, int x, int y, int height /*useless*/) {
Fl_Gl_Window *glw = w->as_gl_window();
if (!glw) return 0;
Fl_RGB_Image *img = capture_gl_rectangle(glw, 0, 0, glw->w(), glw->h());
fl_draw_image(img->array + (glw->h() - 1) * img->ld(), x, y , glw->w(), glw->h(), 3, - img->ld());
delete img;
return 1;
}
virtual Fl_RGB_Image* rectangle_capture(Fl_Widget *widget, int x, int y, int w, int h) {
Fl_Gl_Window *glw = widget->as_gl_window();
if (!glw) return NULL;
return capture_gl_rectangle(glw, x, y, w, h);
}
};
static Fl_Gl_Device_Plugin Gl_Device_Plugin;
// The purpose of this variable, used in Fl_Gl_Window.cxx, is only to force this file to be loaded
// whenever Fl_Gl_Window.cxx is loaded, that is, whenever fltk_gl is.
FL_EXPORT int fl_gl_load_plugin = 0;
//
// End of "$Id$".
//
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