Mercurial > octave
view libinterp/corefcn/cdisplay.c @ 20831:35241c4b696c
eliminate return statements after calls to error
* Cell.cc, __ichol__.cc, __lin_interpn__.cc, __pchip_deriv__.cc,
besselj.cc, cellfun.cc, colloc.cc, debug.cc, dlmread.cc,
dynamic-ld.cc, filter.cc, find.cc, gl2ps-renderer.cc, load-path.cc,
load-save.cc, ls-mat4.cc, ls-mat5.cc, ls-oct-text.cc, luinc.cc,
max.cc, nproc.cc, oct-hist.cc, oct-map.cc, oct-obj.cc, oct-stream.cc,
ordschur.cc, pinv.cc, pr-output.cc, profiler.cc, psi.cc, quadcc.cc,
qz.cc, rand.cc, strfind.cc, strfns.cc, sysdep.cc, toplev.cc, tril.cc,
typecast.cc, urlwrite.cc, utils.cc, variables.cc: Eliminate return
statements after calls to error.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Wed, 09 Dec 2015 14:00:43 -0500 |
parents | edc4791fbcb2 |
children | babc439a224f |
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/* Copyright (C) 2009-2014 John W. Eaton 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 <http://www.gnu.org/licenses/>. */ #ifdef 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" const char * octave_get_display_info (int *ht, int *wd, int *dp, double *rx, double *ry, int *dpy_avail) { const char *msg = 0; *dpy_avail = 0; #if defined (OCTAVE_USE_WINDOWS_API) HDC hdc = GetDC (0); if (hdc) { *dp = GetDeviceCaps (hdc, BITSPIXEL); *ht = GetDeviceCaps (hdc, VERTRES); *wd = GetDeviceCaps (hdc, HORZRES); double ht_mm = GetDeviceCaps (hdc, VERTSIZE); double wd_mm = GetDeviceCaps (hdc, HORZSIZE); *rx = *wd * 25.4 / wd_mm; *ry = *ht * 25.4 / ht_mm; *dpy_avail = 1; } else msg = "no graphical display found"; #elif defined (HAVE_FRAMEWORK_CARBON) 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. */ double ht_mm = sz_mm.height; double wd_mm = sz_mm.width; *rx = *wd * 25.4 / wd_mm; *ry = *ht * 25.4 / ht_mm; *dpy_avail = 1; } else msg = "no graphical display found"; #elif defined (HAVE_X_WINDOWS) const char *display_name = getenv ("DISPLAY"); if (display_name && *display_name) { Display *display = XOpenDisplay (display_name); if (display) { Screen *screen = DefaultScreenOfDisplay (display); if (screen) { *dp = DefaultDepthOfScreen (screen); *ht = HeightOfScreen (screen); *wd = WidthOfScreen (screen); int screen_number = XScreenNumberOfScreen (screen); double ht_mm = DisplayHeightMM (display, screen_number); double wd_mm = DisplayWidthMM (display, screen_number); *rx = *wd * 25.4 / wd_mm; *ry = *ht * 25.4 / ht_mm; } else msg = "X11 display has no default screen"; XCloseDisplay (display); *dpy_avail = 1; } else msg = "unable to open X11 DISPLAY"; } else msg = "X11 DISPLAY environment variable not set"; #else msg = "no graphical display found"; #endif return msg; }