linux: better method of getting DPI info
insofaras
parent
d0dbf70e48
commit
e3c83c8f09
161
linux_4ed.cpp
161
linux_4ed.cpp
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@ -1975,7 +1975,8 @@ LinuxSetIcon(Display* d, Window w)
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}
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internal void
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LinuxX11ConnectionWatch(Display* dpy, XPointer cdata, int fd, Bool opening, XPointer* wdata){
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LinuxX11ConnectionWatch(Display* dpy, XPointer cdata, int fd, Bool opening, XPointer* wdata)
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{
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struct epoll_event e = {};
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e.events = EPOLLIN | EPOLLET;
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e.data.u64 = LINUX_4ED_EVENT_X11_INTERNAL | fd;
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@ -1984,6 +1985,118 @@ LinuxX11ConnectionWatch(Display* dpy, XPointer cdata, int fd, Bool opening, XPoi
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epoll_ctl(linuxvars.epoll, op, fd, &e);
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}
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internal int
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LinuxGetXSettingsDPI(Display* dpy, int screen)
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{
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struct XSettingHeader {
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u8 type;
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u8 pad0;
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u16 name_len;
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char name[0];
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};
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struct XSettings {
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u8 byte_order;
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u8 pad[3];
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u32 serial;
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u32 num_settings;
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};
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enum { XSettingsTypeInt, XSettingsTypeString, XSettingsTypeColor };
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int dpi = -1;
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unsigned char* prop = NULL;
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char sel_buffer[64];
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struct XSettings* xs;
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const char* p;
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snprintf(sel_buffer, sizeof(sel_buffer), "_XSETTINGS_S%d", screen);
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Atom XSET_SEL = XInternAtom(dpy, sel_buffer, True);
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Atom XSET_SET = XInternAtom(dpy, "_XSETTINGS_SETTINGS", True);
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if(XSET_SEL == None || XSET_SET == None){
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fputs("XSETTINGS unavailable.\n", stderr);
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return dpi;
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}
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Window xset_win = XGetSelectionOwner(dpy, XSET_SEL);
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if(xset_win == None){
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// TODO(inso): listen for the ClientMessage about it becoming available?
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// there's not much point atm if DPI scaling is only done at startup
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goto out;
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}
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{
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Atom type;
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int fmt;
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unsigned long pad, num;
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if(XGetWindowProperty(dpy, xset_win, XSET_SET, 0, 1024, False, XSET_SET, &type, &fmt, &num, &pad, &prop) != Success){
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fputs("XSETTINGS: GetWindowProperty failed.\n", stderr);
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goto out;
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}
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if(fmt != 8){
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fputs("XSETTINGS: Wrong format.\n", stderr);
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goto out;
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}
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}
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xs = (struct XSettings*)prop;
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p = (char*)(xs + 1);
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if(xs->byte_order != 0){
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fputs("FIXME: XSETTINGS not host byte order?\n", stderr);
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goto out;
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}
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for(int i = 0; i < xs->num_settings; ++i){
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struct XSettingHeader* h = (struct XSettingHeader*)p;
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// const char* strs[] = { "Int", "String", "Color" };
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// printf("%s:\t\"%.*s\"\n", strs[h->type], h->name_len, h->name);
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p += sizeof(struct XSettingHeader);
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p += h->name_len;
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p += ((4 - (h->name_len & 3)) & 3);
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p += 4; // serial
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switch(h->type){
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case XSettingsTypeInt: {
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if(strncmp(h->name, "Xft/DPI", h->name_len) == 0){
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dpi = *(i32*)p;
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if(dpi != -1) dpi /= 1024;
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}
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p += 4;
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} break;
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case XSettingsTypeString: {
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u32 len = *(u32*)p;
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p += 4;
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p += len;
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p += ((4 - (len & 3)) & 3);
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} break;
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case XSettingsTypeColor: {
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p += 8;
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} break;
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default: {
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fputs("XSETTINGS: Got invalid type...\n", stderr);
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goto out;
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} break;
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}
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}
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out:
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if(prop){
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XFree(prop);
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}
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return dpi;
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}
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//
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// X11 window init
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//
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@ -2002,8 +2115,8 @@ LinuxX11WindowInit(int argc, char** argv, int* WinWidth, int* WinHeight)
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*WinWidth = linuxvars.settings.window_w;
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*WinHeight = linuxvars.settings.window_h;
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} else {
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*WinWidth = BASE_W;
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*WinHeight = BASE_H;
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*WinWidth = BASE_W * size_change(linuxvars.dpi_x, linuxvars.dpi_y);
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*WinHeight = BASE_H * size_change(linuxvars.dpi_x, linuxvars.dpi_y);
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}
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if (!GLXCanUseFBConfig(linuxvars.XDisplay)){
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@ -2722,6 +2835,28 @@ main(int argc, char **argv)
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#undef LOAD_ATOM
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#if SUPPORT_DPI
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linuxvars.dpi_x = linuxvars.dpi_y = LinuxGetXSettingsDPI(linuxvars.XDisplay, DefaultScreen(linuxvars.XDisplay));
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// fallback
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if(linuxvars.dpi_x == -1){
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int scr = DefaultScreen(linuxvars.XDisplay);
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int dw = DisplayWidth(linuxvars.XDisplay, scr);
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int dh = DisplayHeight(linuxvars.XDisplay, scr);
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int dw_mm = DisplayWidthMM(linuxvars.XDisplay, scr);
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int dh_mm = DisplayHeightMM(linuxvars.XDisplay, scr);
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linuxvars.dpi_x = dw_mm ? dw / (dw_mm / 25.4) : 96;
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linuxvars.dpi_y = dh_mm ? dh / (dh_mm / 25.4) : 96;
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fprintf(stderr, "%dx%d - %dmmx%dmm DPI: %dx%d\n", dw, dh, dw_mm, dh_mm, linuxvars.dpi_x, linuxvars.dpi_y);
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} else {
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fprintf(stderr, "DPI from XSETTINGS: %d\n", linuxvars.dpi_x);
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}
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#endif
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int WinWidth, WinHeight;
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if(!LinuxX11WindowInit(argc, argv, &WinWidth, &WinHeight)){
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return 1;
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@ -2774,26 +2909,6 @@ main(int argc, char **argv)
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XFreePixmap(linuxvars.XDisplay, p);
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}
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//
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// DPI
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//
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#if SUPPORT_DPI
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{
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int scr = DefaultScreen(linuxvars.XDisplay);
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int dw = DisplayWidth(linuxvars.XDisplay, scr);
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int dh = DisplayHeight(linuxvars.XDisplay, scr);
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int dw_mm = DisplayWidthMM(linuxvars.XDisplay, scr);
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int dh_mm = DisplayHeightMM(linuxvars.XDisplay, scr);
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linuxvars.dpi_x = dw_mm ? dw / (dw_mm / 25.4) : 96;
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linuxvars.dpi_y = dh_mm ? dh / (dh_mm / 25.4) : 96;
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fprintf(stderr, "%dx%d - %dmmx%dmm DPI: %dx%d\n", dw, dh, dw_mm, dh_mm, linuxvars.dpi_x, linuxvars.dpi_y);
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}
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#endif
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//
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// Epoll init
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