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Added "xftdpi" tool (bsc#1201966, bsc#1201532)
- To not depend on xrdb which requires the C pre-processor - This decreases the installed size - 4.4.2
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| testX.o | ||
| testX | ||
| active_window.o | ||
| *.o | ||
| active_window | ||
| testX | ||
| xftdpi |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,139 @@ | ||
| /** | ||
| * Copyright (c) 2022 SUSE LLC | ||
| * | ||
| * All Rights Reserved. | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms of version 2 of the GNU General Public License as published | ||
| * by the Free Software Foundation. | ||
| * | ||
| * This program 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. | ||
| **/ | ||
|
|
||
| /** | ||
| * This tool reads and sets the "Xft.dpi" X resource property. | ||
| * | ||
| * Alternatively we could use the "xrdb" tool but unfortunately it depends on the | ||
| * C pre-processor (~22MB!) and increases size of the installed system a lot. | ||
| * | ||
| * Usage: | ||
| * | ||
| * xftdpi [DPI] | ||
| * | ||
| * Without any parameter it prints the current setting (and also the size of the | ||
| * default screen), with a parameter it sets that DPI resolution. | ||
| * | ||
| * | ||
| * This tool uses a simplified implementation because it is supposed to be | ||
| * called only by the YaST starting script, it: | ||
| * | ||
| * - does not validate the argument, make sure it is an integer number with | ||
| * a reasonable value | ||
| * (YaST sets a value in a predefined range, ignoring too high or too low values) | ||
| * | ||
| * - does not merge the X resources, it simply appends the option at the end | ||
| * regardless it is already present or not, calling it several times results | ||
| * in multiple setting present | ||
| * (it should be called just once by the YaST starting script, there are | ||
| * no resources defined in the inst-sys and the last setting wins anyway, | ||
| * see "man XrmGetDatabase") | ||
| * | ||
| * - does not check the maximum size of the X request, we set just a single short | ||
| * value (too long string would need to be split into several calls) | ||
| * | ||
| * Resources, links: | ||
| * | ||
| * - man pages for XOpenDisplay, XrmGetDatabase, XResourceManagerString, ... | ||
| * and other Xlib calls | ||
| * - xrdb sources (https://gitlab.freedesktop.org/xorg/app/xrdb/-/blob/master/xrdb.c) | ||
| **/ | ||
|
|
||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
|
|
||
| #include <X11/Xlib.h> | ||
| #include <X11/Xresource.h> | ||
| #include <X11/Xatom.h> | ||
|
|
||
| // compute DPI resolution from pixels and milimeters | ||
| int resolution(int width_px, int width_mm); | ||
| int resolution(int width_px, int width_mm) | ||
| { | ||
| // avoid division by zero | ||
| if (width_mm == 0) | ||
| return 0; | ||
| else | ||
| return (double)(width_px) / ((double)(width_mm) / 25.4); | ||
| } | ||
|
|
||
| int main(int argc, char **argv) | ||
| { | ||
| // connect to the X server, NULL = use the $DISPLAY env | ||
| Display *display = XOpenDisplay(NULL); | ||
| if (!display) | ||
| { | ||
| return 1; | ||
| } | ||
|
|
||
| // an argument has been passed, set the "Xft.dpi" resource | ||
| if (argc > 1) | ||
| { | ||
| // append "Xfti.dpi: " with the command line argument to the X resources | ||
| const char *xft = "Xft.dpi: "; | ||
| // allocate buffer for the new string, 2 = newline separator + NULL terminator | ||
| char *new_data = malloc(strlen(xft) + strlen(argv[1]) + 2); | ||
| char *ptr = new_data; | ||
|
|
||
| // the existing resources might miss the trailing new line, add it just to be sure | ||
| // (if it already is there then it does not harm, an empty line is allowed) | ||
| ptr[0] = '\n'; | ||
| ptr = ptr + 1; | ||
|
|
||
| // append "Xft.dpi: " | ||
| strcpy(ptr, xft); | ||
| ptr = ptr + strlen(xft); | ||
|
|
||
| // append the command line argument | ||
| strcpy(ptr, argv[1]); | ||
|
|
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| // append the the data to the X server resource property | ||
| XChangeProperty(display, XDefaultRootWindow(display), XA_RESOURCE_MANAGER, | ||
| // 8 = the data is 8 bits per item (8, 16 and 32 are possible) | ||
| XA_STRING, 8, PropModeAppend, (unsigned char *)new_data, strlen(new_data)); | ||
|
|
||
| free(new_data); | ||
| } | ||
| else | ||
| // no command line argument, just dump the current configuration | ||
| { | ||
| Screen *screen = ScreenOfDisplay(display, DefaultScreen(display)); | ||
| printf("Width: %d px, %d mm, %d dpi\n", screen->width, screen->mwidth, | ||
| resolution(screen->width, screen->mwidth)); | ||
| printf("Height: %d px, %d mm, %d dpi\n", screen->height, screen->mheight, | ||
| resolution(screen->height, screen->mheight)); | ||
|
|
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| // initialize database | ||
| XrmInitialize(); | ||
| XGetDefault(display, "", ""); | ||
|
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| XrmDatabase xrdb = XrmGetDatabase(display); | ||
| char *type = NULL; | ||
| XrmValue value; | ||
|
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| // search for the "Xft.dpi" value | ||
| Bool found = XrmGetResource(xrdb, "Xft.dpi", "Xft.Dpi", &type, &value); | ||
|
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| printf("Xft.dpi: "); | ||
| if (found == True && value.addr != NULL) | ||
| printf("%s dpi\n", value.addr); | ||
| else | ||
| printf("not defined\n"); | ||
| } | ||
|
|
||
| XCloseDisplay(display); | ||
| return 0; | ||
| } |