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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING. If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
#if defined (HAVE_CONFIG_H)
# include "config.h"
#endif
#include <stdlib.h>
#if defined (OCTAVE_USE_WINDOWS_API)
#include <windows.h>
#elif defined (HAVE_FRAMEWORK_CARBON)
#include <Carbon/Carbon.h>
#elif defined (HAVE_X_WINDOWS)
#include <X11/Xlib.h>
#endif
#include "cdisplay.h"
// Programming Note: This file exists so that we can hide system
// header files that make heavy use of macros and C-style casts in a C
// language file and avoid warnings about using old-style casts in C++.
// Additionally, on OS X systems, including the Carbon.h header file
// results in the declaration of a "panic" function that conflicts with
// Octave's global panic function, so Carbon.h can't be included in any
// file that also includes Octave's error.h header file.
// Please do NOT eliminate this file and move code from here to
// display.cc.
const char *
octave_get_display_info (const char *dpy_name, int *ht, int *wd, int *dp,
double *rx, double *ry, int *dpy_avail)
{
const char *msg = NULL;
*dpy_avail = 0;
double ht_mm = 0.0;
double wd_mm = 0.0;
#if defined (OCTAVE_USE_WINDOWS_API)
octave_unused_parameter (dpy_name);
HDC hdc = GetDC (0);
if (hdc)
{
*dp = GetDeviceCaps (hdc, BITSPIXEL);
*ht = GetDeviceCaps (hdc, VERTRES);
*wd = GetDeviceCaps (hdc, HORZRES);
ht_mm = GetDeviceCaps (hdc, VERTSIZE);
wd_mm = GetDeviceCaps (hdc, HORZSIZE);
*dpy_avail = 1;
}
else
msg = "no graphical display found";
#elif defined (HAVE_FRAMEWORK_CARBON)
octave_unused_parameter (dpy_name);
CGDirectDisplayID display = CGMainDisplayID ();
if (display)
{
#if defined (HAVE_CARBON_CGDISPLAYBITSPERPIXEL)
*dp = CGDisplayBitsPerPixel (display);
#else
/* FIXME: This will only work for MacOS > 10.5. For earlier versions
this code is not needed (use CGDisplayBitsPerPixel instead). */
CGDisplayModeRef mode = CGDisplayCopyDisplayMode (display);
CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (mode);
if (CFStringCompare (pixelEncoding, CFSTR (IO32BitDirectPixels), 0) == 0)
*dp = 32;
else if (CFStringCompare (pixelEncoding,
CFSTR (IO16BitDirectPixels), 0) == 0)
*dp = 16;
else
*dp = 8;
#endif
*ht = CGDisplayPixelsHigh (display);
*wd = CGDisplayPixelsWide (display);
CGSize sz_mm = CGDisplayScreenSize (display);
/* For MacOS >= 10.6, CGSize is a struct keeping 2 CGFloat
values, but the CGFloat typedef is not present on older
systems, so use double instead. */
ht_mm = sz_mm.height;
wd_mm = sz_mm.width;
*dpy_avail = 1;
}
else
msg = "no graphical display found";
#elif defined (HAVE_X_WINDOWS)
/* If dpy_name is NULL, XopenDisplay will look for DISPLAY in the
environment. */
Display *display = XOpenDisplay (dpy_name);
if (display)
{
Screen *screen = DefaultScreenOfDisplay (display);
if (screen)
{
*dp = DefaultDepthOfScreen (screen);
*ht = HeightOfScreen (screen);
*wd = WidthOfScreen (screen);
int screen_number = XScreenNumberOfScreen (screen);
ht_mm = DisplayHeightMM (display, screen_number);
wd_mm = DisplayWidthMM (display, screen_number);
*dpy_avail = 1;
}
else
msg = "X11 display has no default screen";
XCloseDisplay (display);
}
else
msg = "unable to open X11 DISPLAY";
#else
octave_unused_parameter (dpy_name);
octave_unused_parameter (ht);
octave_unused_parameter (wd);
octave_unused_parameter (dp);
octave_unused_parameter (rx);
octave_unused_parameter (ry);
msg = "no graphical display found";
#endif
if (*dpy_avail)
{
if (wd_mm == 0 || ht_mm == 0)
{
msg = "screen width or height reported to be zero";
// Sizes reported as zero have been found on some systems.
// For example, X/Wayland running inside virtualbox.
// Guess a DPI.
*rx = 96.0;
*ry = 96.0;
}
else
{
*rx = *wd * 25.4 / wd_mm;
*ry = *ht * 25.4 / ht_mm;
}
}
return msg;
}
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