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src/java.desktop/unix/native/common/awt/systemscale/systemScale.c

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@@ -20,27 +20,163 @@
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
 
 #include "systemScale.h"
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm_md.h"
+#include <dlfcn.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
-int getNativeScaleFactor() {
+typedef void* g_settings_schema_source_get_default();
+typedef void* g_settings_schema_source_ref(void *);
+typedef void g_settings_schema_source_unref(void *);
+typedef void* g_settings_schema_source_lookup(void *, char *, int);
+typedef int g_settings_schema_has_key(void *, char *);
+typedef void* g_settings_new_full(void *, void *, char *);
+typedef void* g_settings_get_value(void *, char *);
+typedef int g_variant_is_of_type(void *, char *);
+typedef unsigned long g_variant_n_children(void *);
+typedef void* g_variant_get_child_value(void *, unsigned long);
+typedef void  g_variant_unref(void *);
+typedef char*  g_variant_get_string(void *, unsigned long *);
+typedef int  g_variant_get_int32(void *);
+typedef double  g_variant_get_double(void *);
+
+static g_settings_schema_has_key* fp_g_settings_schema_has_key;
+static g_settings_new_full* fp_g_settings_new_full;
+static g_settings_get_value* fp_g_settings_get_value;
+static g_variant_is_of_type* fp_g_variant_is_of_type;
+static g_variant_n_children* fp_g_variant_n_children;
+static g_variant_get_child_value* fp_g_variant_get_child_value;
+static g_variant_get_string* fp_g_variant_get_string;
+static g_variant_get_int32* fp_g_variant_get_int32;
+static g_variant_get_double* fp_g_variant_get_double;
+static g_variant_unref* fp_g_variant_unref;
+
+static void* get_schema_value(char *name, char *key) {
+    static void *lib_handle;
+    static int initialized = 0;
+    static void * default_schema;
+    static g_settings_schema_source_lookup* schema_lookup;
+    if (!initialized) {
+        initialized = 1;
+        void *lib_handle = dlopen(JNI_LIB_NAME("gio-2.0"),
+                                                       RTLD_GLOBAL | RTLD_LAZY);
+        if (!lib_handle) {
+            CHECK_NULL_RETURN(lib_handle =
+                          dlopen(VERSIONED_JNI_LIB_NAME("gio-2.0", "0"),
+                                                RTLD_GLOBAL | RTLD_LAZY), NULL);
+        }
+        CHECK_NULL_RETURN(fp_g_settings_schema_has_key =
+                          dlsym(lib_handle, "g_settings_schema_has_key"), NULL);
+        CHECK_NULL_RETURN(fp_g_settings_new_full =
+                          dlsym(lib_handle, "g_settings_new_full"), NULL);
+        CHECK_NULL_RETURN(fp_g_settings_get_value =
+                          dlsym(lib_handle, "g_settings_get_value"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_is_of_type =
+                          dlsym(lib_handle, "g_variant_is_of_type"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_n_children =
+                          dlsym(lib_handle, "g_variant_n_children"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_get_child_value =
+                          dlsym(lib_handle, "g_variant_get_child_value"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_get_string =
+                          dlsym(lib_handle, "g_variant_get_string"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_get_int32 =
+                          dlsym(lib_handle, "g_variant_get_int32"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_get_double =
+                          dlsym(lib_handle, "g_variant_get_double"), NULL);
+        CHECK_NULL_RETURN(fp_g_variant_unref =
+                          dlsym(lib_handle, "g_variant_unref"), NULL);
+
+        void *fp = dlsym(lib_handle, "g_settings_schema_source_get_default");
+        if (fp) {
+            default_schema = ((g_settings_schema_source_get_default*)fp)();
+        }
+        if (default_schema) {
+            fp = dlsym(lib_handle, "g_settings_schema_source_ref");
+            if (fp) {
+                ((g_settings_schema_source_ref*)fp)(default_schema);
+            }
+        }
+        schema_lookup = dlsym(lib_handle, "g_settings_schema_source_lookup");
+    }
 
-    static int scale = -2.0;
+    if (!default_schema || !schema_lookup) {
+        return NULL;
+    }
+    void *schema = schema_lookup(default_schema, name, 1);
+    if (schema) {
+        if (fp_g_settings_schema_has_key(schema, key)) {
+            void *settings = fp_g_settings_new_full(schema, NULL, NULL);
+            if (settings) {
+                return fp_g_settings_get_value(settings, key);
+            }
+        }
+    }
+    return NULL;
+}
 
-    if (scale == -2) {
-        scale = getScale("J2D_UISCALE");
+
+static double getDesktopScale(char *output_name) {
+    double result = -1;
+    if(output_name) {
+        void *value = get_schema_value("com.ubuntu.user-interface",
+                                                                "scale-factor");
+        if (value) {
+            if(fp_g_variant_is_of_type(value, "a{si}")) {
+                int num = fp_g_variant_n_children(value);
+                int i = 0;
+                while (i < num) {
+                    void *entry = fp_g_variant_get_child_value(value, i++);
+                    if (entry) {
+                        void *screen = fp_g_variant_get_child_value(entry, 0);
+                        void *scale = fp_g_variant_get_child_value(entry, 1);
+                        if (screen && scale) {
+                            char *name = fp_g_variant_get_string(screen, NULL);
+                            if (name && strcmp(name, output_name)) {
+                                result = fp_g_variant_get_int32(scale) / 8.;
+                            }
+                            fp_g_variant_unref(screen);
+                            fp_g_variant_unref(scale);
+                        }
+                        fp_g_variant_unref(entry);
+                    }
+                    if (result > 0) {
+                        break;
+                    }
+                }
+            }
+            fp_g_variant_unref(value);
+        }
+        if (result > 0) {
+            value = get_schema_value("com.canonical.Unity.Interface",
+                                                           "text-scale-factor");
+            if (value && fp_g_variant_is_of_type(value, "d")) {
+                result *= fp_g_variant_get_double(value);
+                fp_g_variant_unref(value);
+            }
+        }
     }
 
-    if (scale >= 1) {
-        return (int) scale;
+    if (result <= 0) {
+        void *value = get_schema_value("org.gnome.desktop.interface",
+                                                         "text-scaling-factor");
+        if (value && fp_g_variant_is_of_type(value, "d")) {
+            result = fp_g_variant_get_double(value);
+            fp_g_variant_unref(value);
     }
-    return getScale("GDK_SCALE");
+    }
+
+    return result;
+
 }
 
-int getScale(const char *name) {
+static int getScale(const char *name) {
     char *uiScale = getenv(name);
     if (uiScale != NULL) {
         double scale = strtod(uiScale, NULL);
         if (scale < 1) {
             return -1;

@@ -48,5 +184,27 @@
         return (int) scale;
     }
     return -1;
 }
 
+double getNativeScaleFactor(char *output_name) {
+
+    static int scale = -2.0;
+
+    if (scale == -2) {
+        scale = getScale("J2D_UISCALE");
+    }
+
+    if (scale > 0) {
+        return scale;
+    }
+
+    double native_scale = getDesktopScale(output_name);
+
+    if (native_scale <= 0) {
+        native_scale = 1;
+    }
+
+    int gdk_scale = getScale("GDK_SCALE");
+
+    return gdk_scale > 0 ? native_scale * gdk_scale : native_scale;
+}
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