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Use Xrandr to get the true DPI of the display under the X11 platform.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@11788 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy
2016-06-22 05:58:30 +00:00
parent 6b95819984
commit 1919691343
1 changed files with 42 additions and 6 deletions
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src/screen_xywh.cxx
+42 -6
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@@ -156,9 +156,43 @@ typedef struct {
static FLScreenInfo screens[MAX_SCREENS];
static float dpi[MAX_SCREENS][2];
#define USE_XRANDR (HAVE_DLSYM && HAVE_DLFCN_H) // means attempt to dynamically load libXrandr.so
#if USE_XRANDR
#include <dlfcn.h>
typedef struct {
int width, height;
int mwidth, mheight;
} XRRScreenSize;
typedef XRRScreenSize* (*XRRSizes_type)(Display *dpy, int screen, int *nsizes);
#endif // USE_XRANDR
static void screen_init() {
if (!fl_display) fl_open_display();
// FIXME: Rewrite using RandR instead
int dpi_by_randr = 0;
float dpih, dpiv;
#if USE_XRANDR
static XRRSizes_type XRRSizes_f = NULL;
if (!XRRSizes_f) {
void *libxrandr_addr = dlopen("libXrandr.so.2", RTLD_LAZY);
if (!libxrandr_addr) libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
# ifdef __APPLE_CC__ // allows testing on Darwin + X11
if (!libxrandr_addr) libxrandr_addr = dlopen("/opt/X11/lib/libXrandr.dylib", RTLD_LAZY);
# endif
if (libxrandr_addr) XRRSizes_f = (XRRSizes_type)dlsym(libxrandr_addr, "XRRSizes");
}
if (XRRSizes_f) {
int nscreens;
XRRScreenSize *ssize = XRRSizes_f(fl_display, fl_screen, &nscreens);
// for(int i=0;i<nscreens;i++)
// printf("width=%d height=%d mwidth=%d mheight=%d\n",ssize[i].width,ssize[i].height,ssize[i].mwidth,ssize[i].mheight);
int mm = ssize[0].mwidth;
dpih = mm ? ssize[0].width*25.4f/mm : 0.0f;
mm = ssize[0].mheight;
dpiv = mm ? ssize[0].height*25.4f/mm : 0.0f;
dpi_by_randr = 1;
}
#endif // USE_XRANDR
#if HAVE_XINERAMA
if (XineramaIsActive(fl_display)) {
XineramaScreenInfo *xsi = XineramaQueryScreens(fl_display, &num_screens);
@@ -170,11 +204,13 @@ static void screen_init() {
screens[i].y_org = xsi[i].y_org;
screens[i].width = xsi[i].width;
screens[i].height = xsi[i].height;
int mm = DisplayWidthMM(fl_display, fl_screen);
dpi[i][0] = mm ? screens[i].width*25.4f/mm : 0.0f;
mm = DisplayHeightMM(fl_display, fl_screen);
dpi[i][1] = mm ? screens[i].height*25.4f/mm : 0.0f;
if (dpi_by_randr) { dpi[i][0] = dpih; dpi[i][1] = dpiv; }
else {
int mm = DisplayWidthMM(fl_display, fl_screen);
dpi[i][0] = mm ? screens[i].width*25.4f/mm : 0.0f;
mm = DisplayHeightMM(fl_display, fl_screen);
dpi[i][1] = mm ? screens[i].height*25.4f/mm : 0.0f;
}
}
if (xsi) XFree(xsi);
} else