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 if (!initialized) { 65 initialized = 1; 66 void *lib_handle = dlopen(JNI_LIB_NAME("gio-2.0"), 67 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 dlsym(lib_handle, "g_settings_schema_has_key"), NULL); 75 CHECK_NULL_RETURN(fp_g_settings_new_full = 76 dlsym(lib_handle, "g_settings_new_full"), NULL); 77 CHECK_NULL_RETURN(fp_g_settings_get_value = 78 dlsym(lib_handle, "g_settings_get_value"), NULL); 79 CHECK_NULL_RETURN(fp_g_variant_is_of_type = 80 dlsym(lib_handle, "g_variant_is_of_type"), NULL); 81 CHECK_NULL_RETURN(fp_g_variant_n_children = 82 dlsym(lib_handle, "g_variant_n_children"), NULL); 83 CHECK_NULL_RETURN(fp_g_variant_get_child_value = 84 dlsym(lib_handle, "g_variant_get_child_value"), NULL); 85 CHECK_NULL_RETURN(fp_g_variant_get_string = 86 dlsym(lib_handle, "g_variant_get_string"), NULL); 87 CHECK_NULL_RETURN(fp_g_variant_get_int32 = 88 dlsym(lib_handle, "g_variant_get_int32"), NULL); 89 CHECK_NULL_RETURN(fp_g_variant_get_double = 90 dlsym(lib_handle, "g_variant_get_double"), NULL); 91 CHECK_NULL_RETURN(fp_g_variant_unref = 92 dlsym(lib_handle, "g_variant_unref"), NULL); 93 94 void *fp = dlsym(lib_handle, "g_settings_schema_source_get_default"); 95 if (fp) { 96 default_schema = ((g_settings_schema_source_get_default*)fp)(); 97 } 98 if (default_schema) { 99 fp = dlsym(lib_handle, "g_settings_schema_source_ref"); 100 if (fp) { 101 ((g_settings_schema_source_ref*)fp)(default_schema); 102 } 103 } 104 schema_lookup = dlsym(lib_handle, "g_settings_schema_source_lookup"); 105 } 106 107 if (!default_schema || !schema_lookup) { 108 return NULL; 109 } 110 void *schema = schema_lookup(default_schema, name, 1); 111 if (schema) { 112 if (fp_g_settings_schema_has_key(schema, key)) { 113 void *settings = fp_g_settings_new_full(schema, NULL, NULL); 114 if (settings) { 115 return fp_g_settings_get_value(settings, key); 116 } 117 } 118 } 119 return NULL; 120 } 121 122 123 static double getDesktopScale(char *output_name) { 124 double result = -1; 125 if(output_name) { 126 void *value = get_schema_value("com.ubuntu.user-interface", 127 "scale-factor"); 128 if (value) { 129 if(fp_g_variant_is_of_type(value, "a{si}")) { 130 int num = fp_g_variant_n_children(value); 131 int i = 0; 132 while (i < num) { 133 void *entry = fp_g_variant_get_child_value(value, i++); 134 if (entry) { 135 void *screen = fp_g_variant_get_child_value(entry, 0); 136 void *scale = fp_g_variant_get_child_value(entry, 1); 137 if (screen && scale) { 138 char *name = fp_g_variant_get_string(screen, NULL); 139 if (name && strcmp(name, output_name)) { 140 result = fp_g_variant_get_int32(scale) / 8.; 141 } 142 fp_g_variant_unref(screen); 143 fp_g_variant_unref(scale); 144 } 145 fp_g_variant_unref(entry); 146 } 147 if (result > 0) { 148 break; 149 } 150 } 151 } 152 fp_g_variant_unref(value); 153 } 154 if (result > 0) { 155 value = get_schema_value("com.canonical.Unity.Interface", 156 "text-scale-factor"); 157 if (value && fp_g_variant_is_of_type(value, "d")) { 158 result *= fp_g_variant_get_double(value); 159 fp_g_variant_unref(value); 160 } 161 } 162 } 163 164 if (result <= 0) { 165 void *value = get_schema_value("org.gnome.desktop.interface", 166 "text-scaling-factor"); 167 if (value && fp_g_variant_is_of_type(value, "d")) { 168 result = fp_g_variant_get_double(value); 169 fp_g_variant_unref(value); 170 } 171 } 172 173 return result; 174 175 } 176 177 static int getScale(const char *name) { 178 char *uiScale = getenv(name); 179 if (uiScale != NULL) { 180 double scale = strtod(uiScale, NULL); 181 if (scale < 1) { 182 return -1; 183 } 184 return (int) scale; 185 } 186 return -1; 187 } 188 189 double getNativeScaleFactor(char *output_name) { 190 191 static int scale = -2.0; 192 193 if (scale == -2) { 194 scale = getScale("J2D_UISCALE"); 195 } 196 197 if (scale > 0) { 198 return scale; 199 } 200 201 double native_scale = getDesktopScale(output_name); 202 203 if (native_scale <= 0) { 204 native_scale = 1; 205 } 206 207 int gdk_scale = getScale("GDK_SCALE"); 208 209 return gdk_scale > 0 ? native_scale * gdk_scale : native_scale; 210 }