From 57143262ac624f33bb77a841c9c50e60e2c8e175 Mon Sep 17 00:00:00 2001
From: zv0n <tom.zvon@gmail.com>
Date: Fri, 18 Dec 2020 15:08:21 +0100
Subject: [PATCH] SDLPP: allow change of font size

---
 sdlpp/sdlpp_font.cpp | 35 +++++++++++++++++++++++++++--------
 sdlpp/sdlpp_font.hpp |  8 ++++++++
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/sdlpp/sdlpp_font.cpp b/sdlpp/sdlpp_font.cpp
index 81b6996..f4d7f11 100644
--- a/sdlpp/sdlpp_font.cpp
+++ b/sdlpp/sdlpp_font.cpp
@@ -1,16 +1,14 @@
 #include "sdlpp_font.hpp"
 
 namespace SDLPP {
-Font::Font( const std::string &font, int size ) {
-    font_ptr = TTF_OpenFont( font.c_str(), size );
-    if ( font_ptr == NULL ) {
-        std::cerr << "Unable to load font '" << font
-                  << "': TTF Error: " << TTF_GetError() << std::endl;
-        throw "TTF_OpenFont error";
-    }
+Font::Font( const std::string &font ) : font_path(font) {}
+Font::Font( const std::string &font, int size ) : Font(font) {
+    original_size = size;
+    font_ptr = TTF_OpenFont( font_path.c_str(), size );
+    checkFont();
 }
 Font::~Font() {
-    TTF_CloseFont( font_ptr );
+    closeFont();
 }
 const TTF_Font *Font::getFont() const {
     return font_ptr;
@@ -30,4 +28,25 @@ void Font::setStyle( int style ) {
 void Font::setHinting( int hinting ) {
     TTF_SetFontHinting( font_ptr, hinting );
 }
+void Font::changeFontSize( int size ) {
+    closeFont();
+    font_ptr = TTF_OpenFont( font_path.c_str(), size );
+    checkFont();
+}
+void Font::revertSize() {
+    closeFont();
+    font_ptr = TTF_OpenFont( font_path.c_str(), original_size );
+    checkFont();
+}
+
+void Font::closeFont() {
+    TTF_CloseFont( font_ptr );
+}
+void Font::checkFont() {
+    if ( font_ptr == NULL ) {
+        std::cerr << "Unable to load font '" << font_path
+                  << "': TTF Error: " << TTF_GetError() << std::endl;
+        throw "TTF_OpenFont error";
+    }
+}
 } // namespace SDLPP
diff --git a/sdlpp/sdlpp_font.hpp b/sdlpp/sdlpp_font.hpp
index 7983cde..b97fece 100644
--- a/sdlpp/sdlpp_font.hpp
+++ b/sdlpp/sdlpp_font.hpp
@@ -9,6 +9,7 @@ namespace SDLPP {
 class SDLPPSCOPE Font {
 public:
     Font() = delete;
+    Font( const std::string &font );
     Font( const std::string &font, int size );
     virtual ~Font();
     const TTF_Font *getFont() const;
@@ -17,9 +18,16 @@ public:
     int getOutline();
     void setStyle( int style );
     void setHinting( int hinting );
+    void changeFontSize( int size );
+    void revertSize();
 
 private:
+    void closeFont();
+    void checkFont();
+
     TTF_Font *font_ptr;
+    const std::string font_path;
+    int original_size = -1;
 };
 } // namespace SDLPP
 #endif