mirror of https://github.com/axmolengine/axmol.git
32 lines
745 B
C++
32 lines
745 B
C++
#include "platform/CCDevice.h"
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#include <X11/Xlib.h>
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#include <stdio.h>
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NS_CC_BEGIN
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int Device::getDPI()
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{
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static int dpi = -1;
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if (dpi == -1)
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{
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Display *dpy;
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char *displayname = NULL;
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int scr = 0; /* Screen number */
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dpy = XOpenDisplay (displayname);
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/*
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* there are 2.54 centimeters to an inch; so there are 25.4 millimeters.
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*
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* dpi = N pixels / (M millimeters / (25.4 millimeters / 1 inch))
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* = N pixels / (M inch / 25.4)
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* = N * 25.4 pixels / M inch
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*/
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double xres = ((((double) DisplayWidth(dpy,scr)) * 25.4) /
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((double) DisplayWidthMM(dpy,scr)));
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dpi = (int) (xres + 0.5);
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//printf("dpi = %d\n", dpi);
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}
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return dpi;
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}
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NS_CC_END
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