1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include "systemScale.h"
25 #include "jni.h"
26 #include "jni_util.h"
27 #include "jvm_md.h"
28 #include <dlfcn.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32
33 typedef void* g_settings_schema_source_get_default();
34 typedef void* g_settings_schema_source_ref(void *);
35 typedef void g_settings_schema_source_unref(void *);
36 typedef void* g_settings_schema_source_lookup(void *, char *, int);
37 typedef int g_settings_schema_has_key(void *, char *);
38 typedef void* g_settings_new_full(void *, void *, char *);
39 typedef void* g_settings_get_value(void *, char *);
40 typedef int g_variant_is_of_type(void *, char *);
41 typedef unsigned long g_variant_n_children(void *);
42 typedef void* g_variant_get_child_value(void *, unsigned long);
43 typedef void g_variant_unref(void *);
44 typedef char* g_variant_get_string(void *, unsigned long *);
45 typedef int g_variant_get_int32(void *);
46 typedef double g_variant_get_double(void *);
47
48 static g_settings_schema_has_key* fp_g_settings_schema_has_key;
49 static g_settings_new_full* fp_g_settings_new_full;
50 static g_settings_get_value* fp_g_settings_get_value;
51 static g_variant_is_of_type* fp_g_variant_is_of_type;
52 static g_variant_n_children* fp_g_variant_n_children;
53 static g_variant_get_child_value* fp_g_variant_get_child_value;
54 static g_variant_get_string* fp_g_variant_get_string;
55 static g_variant_get_int32* fp_g_variant_get_int32;
56 static g_variant_get_double* fp_g_variant_get_double;
57 static g_variant_unref* fp_g_variant_unref;
58
59 static void* get_schema_value(char *name, char *key) {
60 static void *lib_handle;
61 static int initialized = 0;
62 static void * default_schema;
63 static g_settings_schema_source_lookup* schema_lookup;
64 void *schema = NULL, *fp = NULL;
65 if (!initialized) {
66 initialized = 1;
67 lib_handle = dlopen(JNI_LIB_NAME("gio-2.0"), RTLD_GLOBAL | RTLD_LAZY);
68 if (!lib_handle) {
69 CHECK_NULL_RETURN(lib_handle =
70 dlopen(VERSIONED_JNI_LIB_NAME("gio-2.0", "0"),
71 RTLD_GLOBAL | RTLD_LAZY), NULL);
72 }
73 CHECK_NULL_RETURN(fp_g_settings_schema_has_key =
74 (g_settings_schema_has_key*)
75 dlsym(lib_handle, "g_settings_schema_has_key"), NULL);
76 CHECK_NULL_RETURN(fp_g_settings_new_full =
77 (g_settings_new_full*)
78 dlsym(lib_handle, "g_settings_new_full"), NULL);
79 CHECK_NULL_RETURN(fp_g_settings_get_value =
80 (g_settings_get_value*)
81 dlsym(lib_handle, "g_settings_get_value"), NULL);
82 CHECK_NULL_RETURN(fp_g_variant_is_of_type =
83 (g_variant_is_of_type*)
84 dlsym(lib_handle, "g_variant_is_of_type"), NULL);
85 CHECK_NULL_RETURN(fp_g_variant_n_children =
86 (g_variant_n_children*)
87 dlsym(lib_handle, "g_variant_n_children"), NULL);
88 CHECK_NULL_RETURN(fp_g_variant_get_child_value =
89 (g_variant_get_child_value*)
90 dlsym(lib_handle, "g_variant_get_child_value"), NULL);
91 CHECK_NULL_RETURN(fp_g_variant_get_string =
92 (g_variant_get_string*)
93 dlsym(lib_handle, "g_variant_get_string"), NULL);
94 CHECK_NULL_RETURN(fp_g_variant_get_int32 =
95 (g_variant_get_int32*)
96 dlsym(lib_handle, "g_variant_get_int32"), NULL);
97 CHECK_NULL_RETURN(fp_g_variant_get_double =
98 (g_variant_get_double*)
99 dlsym(lib_handle, "g_variant_get_double"), NULL);
100 CHECK_NULL_RETURN(fp_g_variant_unref =
101 (g_variant_unref*)
102 dlsym(lib_handle, "g_variant_unref"), NULL);
103
104 fp = dlsym(lib_handle, "g_settings_schema_source_get_default");
105 if (fp) {
106 default_schema = ((g_settings_schema_source_get_default*)fp)();
107 }
108 if (default_schema) {
109 fp = dlsym(lib_handle, "g_settings_schema_source_ref");
110 if (fp) {
111 ((g_settings_schema_source_ref*)fp)(default_schema);
112 }
113 }
114 schema_lookup = (g_settings_schema_source_lookup*)
115 dlsym(lib_handle, "g_settings_schema_source_lookup");
116 }
117
118 if (!default_schema || !schema_lookup) {
119 return NULL;
120 }
121
122 schema = schema_lookup(default_schema, name, 1);
123 if (schema) {
124 if (fp_g_settings_schema_has_key(schema, key)) {
125 void *settings = fp_g_settings_new_full(schema, NULL, NULL);
126 if (settings) {
127 return fp_g_settings_get_value(settings, key);
128 }
129 }
130 }
131 return NULL;
132 }
133
134
135 static double getDesktopScale(char *output_name) {
136 double result = -1;
137 if(output_name) {
138 void *value = get_schema_value("com.ubuntu.user-interface",
139 "scale-factor");
140 if (value) {
141 if(fp_g_variant_is_of_type(value, "a{si}")) {
142 int num = fp_g_variant_n_children(value);
143 int i = 0;
144 while (i < num) {
145 void *entry = fp_g_variant_get_child_value(value, i++);
146 if (entry) {
147 void *screen = fp_g_variant_get_child_value(entry, 0);
148 void *scale = fp_g_variant_get_child_value(entry, 1);
149 if (screen && scale) {
150 char *name = fp_g_variant_get_string(screen, NULL);
151 if (name && strcmp(name, output_name)) {
152 result = fp_g_variant_get_int32(scale) / 8.;
153 }
154 fp_g_variant_unref(screen);
155 fp_g_variant_unref(scale);
156 }
157 fp_g_variant_unref(entry);
158 }
159 if (result > 0) {
160 break;
161 }
162 }
163 }
164 fp_g_variant_unref(value);
165 }
166 if (result > 0) {
167 value = get_schema_value("com.canonical.Unity.Interface",
168 "text-scale-factor");
169 if (value && fp_g_variant_is_of_type(value, "d")) {
170 result *= fp_g_variant_get_double(value);
171 fp_g_variant_unref(value);
172 }
173 }
174 }
175
176 if (result <= 0) {
177 void *value = get_schema_value("org.gnome.desktop.interface",
178 "text-scaling-factor");
179 if (value && fp_g_variant_is_of_type(value, "d")) {
180 result = fp_g_variant_get_double(value);
181 fp_g_variant_unref(value);
182 }
183 }
184
185 return result;
186
187 }
188
189 static int getScale(const char *name) {
190 char *uiScale = getenv(name);
191 if (uiScale != NULL) {
192 double scale = strtod(uiScale, NULL);
193 if (scale < 1) {
194 return -1;
195 }
196 return (int) scale;
197 }
198 return -1;
199 }
200
201 double getNativeScaleFactor(char *output_name) {
202 static int scale = -2.0;
203 double native_scale = 0;
204 int gdk_scale = 0;
205
206 if (scale == -2) {
207 scale = getScale("J2D_UISCALE");
208 }
209
210 if (scale > 0) {
211 return scale;
212 }
213
214 native_scale = getDesktopScale(output_name);
215
216 if (native_scale <= 0) {
217 native_scale = 1;
218 }
219
220 gdk_scale = getScale("GDK_SCALE");
221
222 return gdk_scale > 0 ? native_scale * gdk_scale : native_scale;
223 }