From c207201a4a5a47e4ad286ba7371e4176c8ed5056 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 19 Mar 2021 12:22:25 +0100
Subject: Start on touch support, add support for ui scaling, revert back to
 old get_message_by_id method for matrix to support loading user display names
 in replies

---
 src/Utils.cpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/Utils.cpp

(limited to 'src/Utils.cpp')

diff --git a/src/Utils.cpp b/src/Utils.cpp
new file mode 100644
index 0000000..2c3bfb7
--- /dev/null
+++ b/src/Utils.cpp
@@ -0,0 +1,58 @@
+#include "../include/Utils.hpp"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <locale.h>
+
+namespace QuickMedia {
+    static float scale = 1.0f;
+    static bool scale_set = false;
+
+    static const int XFT_DPI_DEFAULT = 96;
+    // Returns 96 on error
+    static int xrdb_get_dpi() {
+        int xft_dpi = XFT_DPI_DEFAULT;
+
+        FILE *xrdb_query = popen("xrdb -query", "r");
+        if(!xrdb_query)
+            return xft_dpi;
+
+        char line[512];
+        while(fgets(line, sizeof(line), xrdb_query)) {
+            int line_length = strlen(line);
+            if(line_length > 0 && line[line_length - 1] == '\n') {
+                line[line_length - 1] = '\0';
+                line_length--;
+            }
+
+            if(line_length > 8 && memcmp(line, "Xft.dpi:", 8) == 0) {
+                int xft_dpi_file = atoi(line + 8);
+                if(xft_dpi_file > 0) {
+                    xft_dpi = xft_dpi_file;
+                    break;
+                }
+            }
+        }
+
+        pclose(xrdb_query);
+        return xft_dpi;
+    }
+
+    float get_ui_scale() {
+        if(scale_set)
+            return scale;
+
+        char *gdk_scale = getenv("GDK_SCALE");
+        if(gdk_scale) {
+            setlocale(LC_ALL, "C"); // Sigh... stupid C
+            scale = atof(gdk_scale);
+            if(scale < 0.0001f)
+                scale = 1.0f;
+        } else {
+            scale = (float)xrdb_get_dpi() / (float)XFT_DPI_DEFAULT;
+        }
+
+        scale_set = true;
+        return scale;
+    }
+}
\ No newline at end of file
-- 
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