1/*
2 Simple DirectMedia Layer
3 Copyright 2024 Igalia S.L.
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22#include "SDL_internal.h"
23
24#if defined(SDL_VIDEO_DRIVER_X11)
25
26#include "SDL_x11video.h"
27#include "SDL_x11settings.h"
28
29#define SDL_XSETTINGS_GDK_WINDOW_SCALING_FACTOR "Gdk/WindowScalingFactor"
30#define SDL_XSETTINGS_XFT_DPI "Xft/DPI"
31
32static void X11_XsettingsNotify(const char *name, XSettingsAction action, XSettingsSetting *setting, void *data)
33{
34 SDL_VideoDevice *_this = data;
35 float scale_factor = 1.0;
36 int i;
37
38 if (SDL_strcmp(name, SDL_XSETTINGS_GDK_WINDOW_SCALING_FACTOR) != 0 ||
39 SDL_strcmp(name, SDL_XSETTINGS_XFT_DPI) != 0) {
40 return;
41 }
42
43 if (setting->type != XSETTINGS_TYPE_INT) {
44 return;
45 }
46
47 switch (action) {
48 case XSETTINGS_ACTION_NEW:
49 SDL_FALLTHROUGH;
50 case XSETTINGS_ACTION_CHANGED:
51 scale_factor = setting->data.v_int;
52 if (SDL_strcmp(name, SDL_XSETTINGS_XFT_DPI) == 0) {
53 scale_factor = scale_factor / 1024.0f / 96.0f;
54 }
55 break;
56 case XSETTINGS_ACTION_DELETED:
57 scale_factor = 1.0;
58 break;
59 }
60
61 if (_this) {
62 for (i = 0; i < _this->num_displays; ++i) {
63 SDL_SetDisplayContentScale(_this->displays[i], scale_factor);
64 }
65 }
66}
67
68void X11_InitXsettings(SDL_VideoDevice *_this)
69{
70 SDL_VideoData *data = _this->internal;
71 SDLX11_SettingsData *xsettings_data = &data->xsettings_data;
72
73 xsettings_data->xsettings = xsettings_client_new(data->display,
74 DefaultScreen(data->display), X11_XsettingsNotify, NULL, _this);
75
76}
77
78void X11_QuitXsettings(SDL_VideoDevice *_this)
79{
80 SDL_VideoData *data = _this->internal;
81 SDLX11_SettingsData *xsettings_data = &data->xsettings_data;
82
83 if (xsettings_data->xsettings) {
84 xsettings_client_destroy(xsettings_data->xsettings);
85 xsettings_data->xsettings = NULL;
86 }
87}
88
89void X11_HandleXsettings(SDL_VideoDevice *_this, const XEvent *xevent)
90{
91 SDL_VideoData *data = _this->internal;
92 SDLX11_SettingsData *xsettings_data = &data->xsettings_data;
93
94 if (xsettings_data->xsettings) {
95 if (!xsettings_client_process_event(xsettings_data->xsettings, xevent)) {
96 xsettings_client_destroy(xsettings_data->xsettings);
97 xsettings_data->xsettings = NULL;
98 }
99 }
100}
101
102int X11_GetXsettingsIntKey(SDL_VideoDevice *_this, const char *key, int fallback_value) {
103 SDL_VideoData *data = _this->internal;
104 SDLX11_SettingsData *xsettings_data = &data->xsettings_data;
105 XSettingsSetting *setting = NULL;
106 int res = fallback_value;
107
108
109 if (xsettings_data->xsettings) {
110 if (xsettings_client_get_setting(xsettings_data->xsettings, key, &setting) != XSETTINGS_SUCCESS) {
111 goto no_key;
112 }
113
114 if (setting->type != XSETTINGS_TYPE_INT) {
115 goto no_key;
116 }
117
118 res = setting->data.v_int;
119 }
120
121no_key:
122 if (setting) {
123 xsettings_setting_free(setting);
124 }
125
126 return res;
127}
128
129#endif // SDL_VIDEO_DRIVER_X11
130