Add QM_USE_SYSTEM_FONTS environment variable to use system fonts instead of noto fonts

1 files changed, 50 insertions, 9 deletions

diff --git a/src/ResourceLoader.cpp b/src/ResourceLoader.cpp
index fbcbe39..2725898 100644
--- a/src/ResourceLoader.cpp
+++ b/src/ResourceLoader.cpp
@@ -1,4 +1,7 @@
 #include "../include/ResourceLoader.hpp"
+#include "../include/Program.hpp"
+#include "../include/Path.hpp"
+#include "../include/StringUtils.hpp"
 #include <SFML/Graphics/Font.hpp>
 #include <SFML/Graphics/Texture.hpp>
 #include <array>
@@ -9,6 +12,7 @@
 static std::string resource_root;
 static std::array<std::unique_ptr<sf::Font>, 4> font_cache;
 static std::unordered_map<std::string, std::unique_ptr<sf::Texture>> texture_cache;
+static bool use_system_fonts = false;
 
 namespace QuickMedia {
     void set_resource_loader_root_path(const char *new_resource_root) {
@@ -18,9 +22,21 @@ namespace QuickMedia {
     const char* get_resource_loader_root_path() {
         return resource_root.c_str();
     }
+
+    void set_use_system_fonts(bool use) {
+        use_system_fonts = use;
+    }
 }
 
 namespace QuickMedia::FontLoader {
+    static int accumulate_string(char *data, int size, void *userdata) {
+        std::string *str = (std::string*)userdata;
+        if(str->size() + size > 1024 * 1024 * 100) // 100mb sane limit, TODO: make configurable
+            return 1;
+        str->append(data, size);
+        return 0;
+    }
+
     sf::Font* get_font(FontType font_type) {
         sf::Font *font = font_cache[(size_t)font_type].get();
         if(!font) {
@@ -29,24 +45,49 @@ namespace QuickMedia::FontLoader {
             std::string font_file_name;
             switch(font_type) {
                 case FontType::LATIN: {
-                    noto_directories.push_back("/usr/share/fonts/noto");
-                    noto_directories.push_back("/usr/share/fonts/truetype/noto");
-                    font_file_name = "NotoSans-Regular.ttf";
+                    std::string output;
+                    const char *args[] = { "fc-match", "sans:lang=en", "file", nullptr };
+                    if(use_system_fonts && exec_program(args, accumulate_string, &output) == 0 && output.size() > 6) {
+                        Path path = strip(output.substr(6));
+                        noto_directories.push_back(path.parent().data);
+                        font_file_name = path.filename();
+                    } else {
+                        noto_directories.push_back("/usr/share/fonts/noto");
+                        noto_directories.push_back("/usr/share/fonts/truetype/noto");
+                        font_file_name = "NotoSans-Regular.ttf";
+                    }
                     break;
                 }
                 case FontType::LATIN_BOLD: {
-                    noto_directories.push_back("/usr/share/fonts/noto");
-                    noto_directories.push_back("/usr/share/fonts/truetype/noto");
-                    font_file_name = "NotoSans-Bold.ttf";
+                    std::string output;
+                    const char *args[] = { "fc-match", "sans:bold:lang=en", "file", nullptr };
+                    if(use_system_fonts && exec_program(args, accumulate_string, &output) == 0 && output.size() > 6) {
+                        Path path = strip(output.substr(6));
+                        noto_directories.push_back(path.parent().data);
+                        font_file_name = path.filename();
+                    } else {
+                        noto_directories.push_back("/usr/share/fonts/noto");
+                        noto_directories.push_back("/usr/share/fonts/truetype/noto");
+                        font_file_name = "NotoSans-Bold.ttf";
+                    }
                     break;
                 }
                 case FontType::CJK: {
-                    noto_directories.push_back("/usr/share/fonts/noto-cjk");
-                    noto_directories.push_back("/usr/share/fonts/opentype/noto");
-                    font_file_name = "NotoSansCJK-Regular.ttc";
+                    std::string output;
+                    const char *args[] = { "fc-match", "sans:lang=ja", "file", nullptr };
+                    if(use_system_fonts && exec_program(args, accumulate_string, &output) == 0 && output.size() > 6) {
+                        Path path = strip(output.substr(6));
+                        noto_directories.push_back(path.parent().data);
+                        font_file_name = path.filename();
+                    } else {
+                        noto_directories.push_back("/usr/share/fonts/noto-cjk");
+                        noto_directories.push_back("/usr/share/fonts/truetype/noto-cjk");
+                        font_file_name = "NotoSansCJK-Regular.ttc";
+                    }
                     break;
                 }
                 case FontType::SYMBOLS: {
+                    // TODO: Allow changing with system font setting
                     noto_directories.push_back("/usr/share/fonts/noto");
                     noto_directories.push_back("/usr/share/fonts/truetype/noto");
                     font_file_name = "NotoSansSymbols2-Regular.ttf";