Text: made constructors explicit.

src/Text/AbstractFont.h

@@ -48,7 +48,7 @@ class MAGNUM_TEXT_EXPORT AbstractFont {
     AbstractFont& operator=(const AbstractFont&&) = delete;
 
     public:
-        AbstractFont();
+        explicit AbstractFont();
         virtual ~AbstractFont() = 0;
 
         /** @brief %Font texture atlas */
@@ -81,7 +81,7 @@ class MAGNUM_TEXT_EXPORT AbstractLayouter {
     AbstractLayouter& operator=(const AbstractLayouter&&) = delete;
 
     public:
-        AbstractLayouter();
+        explicit AbstractLayouter();
         virtual ~AbstractLayouter() = 0;
 
         /** @brief Count of glyphs in laid out text */

src/Text/FreeTypeFont.cpp

@@ -40,7 +40,7 @@ namespace {
 
 class FreeTypeLayouter: public AbstractLayouter {
     public:
-        FreeTypeLayouter(FreeTypeFont& font, const Float size, const std::string& text);
+        explicit FreeTypeLayouter(FreeTypeFont& font, const Float size, const std::string& text);
 
         std::tuple<Rectangle, Rectangle, Vector2> renderGlyph(const Vector2& cursorPosition, const UnsignedInt i) override;
 

src/Text/HarfBuzzFont.cpp

@@ -32,7 +32,7 @@ namespace {
 
 class HarfBuzzLayouter: public AbstractLayouter {
     public:
-        HarfBuzzLayouter(HarfBuzzFont& font, const Float size, const std::string& text);
+        explicit HarfBuzzLayouter(HarfBuzzFont& font, const Float size, const std::string& text);
         ~HarfBuzzLayouter();
 
         std::tuple<Rectangle, Rectangle, Vector2> renderGlyph(const Vector2& cursorPosition, const UnsignedInt i) override;

src/Text/TextRenderer.h

@@ -66,7 +66,7 @@ class MAGNUM_TEXT_EXPORT AbstractTextRenderer {
          * @param font          %Font to use
          * @param size          %Font size
          */
-        AbstractTextRenderer(AbstractFont& font, Float size);
+        explicit AbstractTextRenderer(AbstractFont& font, Float size);
 
         virtual ~AbstractTextRenderer() = 0;
 
@@ -212,7 +212,7 @@ template<UnsignedInt dimensions> class MAGNUM_TEXT_EXPORT TextRenderer: public A
          * @param font          %Font to use
          * @param size          %Font size
          */
-        TextRenderer(AbstractFont& font, Float size);
+        explicit TextRenderer(AbstractFont& font, Float size);
 
         using AbstractTextRenderer::render;
 };