Find noto fonts, update readme

2 files changed, 31 insertions, 2 deletions

diff --git a/README.md b/README.md
index 79c50ba..60ab4df 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,18 @@
 Notification in the style of ShadowPlay.
 
 # Dependencies
-x11, xrandr, xrender, xfixes, opengl
+GPU Screen Recorder overlay uses meson build system so you need to install `meson` to build GPU Screen Recorder overlay.
+
+## Build dependencies
+These are the dependencies needed to build GPU Screen Recorder Notification:
+
+* x11 (libx11, libxrandr, libxrender, libxfixes)
+* libglvnd (which provides libgl, libglx and libegl)
+
+## Runtime dependencies
+There are also additional dependencies needed at runtime:
+
+* Noto fonts
 
 # Installation
 Run `sudo ./install.sh`. This will install gsr-notify to `/usr/bin/gsr-notify`. You can run meson commands manually to install gsr-notify to another directory.
diff --git a/src/main.cpp b/src/main.cpp
index 411ab48..a3503c9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -15,6 +15,7 @@
 #include <map>
 #include <assert.h>
 #include <unistd.h>
+#include <limits.h>
 
 #include <X11/Xlib.h>
 #include <X11/extensions/Xfixes.h>
@@ -155,6 +156,17 @@ static const mgl_monitor* find_monitor_by_cursor_position(mgl::Window &window) {
     return &win->monitors[0];
 }
 
+static std::string find_noto_font_filepath(const char *filename) {
+    const char *directories[] = { "/usr/share/fonts/noto", "/usr/share/fonts/truetype/noto" };
+    char filepath[PATH_MAX];
+    for(const char *directory : directories) {
+        snprintf(filepath, sizeof(filepath), "%s/%s", directory, filename);
+        if(access(filepath, F_OK) == 0)
+            return filepath;
+    }
+    return "";
+}
+
 int main(int argc, char **argv) {
     std::string resources_path;
     if(access("images/stream.png", F_OK) == 0) {
@@ -221,6 +233,12 @@ int main(int argc, char **argv) {
     const mgl::Color icon_color = parse_hex_color(icon_color_str ? icon_color_str : "FFFFFF", resources_path);
     const mgl::Color bg_color = parse_hex_color(bg_color_str ? bg_color_str : "76b900", resources_path);
 
+    const std::string noto_sans_bold_filepath = find_noto_font_filepath("NotoSans-Bold.ttf");
+    if(noto_sans_bold_filepath.empty()) {
+        fprintf(stderr, "error: failed to find NotoSans-Bold.ttf. Make sure noto fonts are installed on your system\n");
+        exit(2);
+    }
+
     mgl::Init init;
 
     mgl::Window::CreateParams window_create_params;
@@ -246,7 +264,7 @@ int main(int argc, char **argv) {
     const mgl_monitor *focused_monitor = find_monitor_by_cursor_position(window);
 
     mgl::MemoryMappedFile font_file;
-    if(!font_file.load("/usr/share/fonts/noto/NotoSans-Bold.ttf", mgl::MemoryMappedFile::LoadOptions{true, false}))
+    if(!font_file.load(noto_sans_bold_filepath.c_str(), mgl::MemoryMappedFile::LoadOptions{true, false}))
         return 1;
 
     mgl::Font font;