Mercurial > jwe > octave
view libinterp/corefcn/cdisplay.c @ 31170:06c76eca5f95 default tip @
maint: merge stable to default
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 29 Jul 2022 12:02:42 -0400 |
parents | 796f54d4ddbf |
children |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 2009-2022 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; }