Text: ability to create Font from memory instead of file.

src/Text/Font.cpp

@@ -27,19 +27,29 @@
 namespace Magnum { namespace Text {
 
 Font::Font(FontRenderer& renderer, const std::string& fontFile, GLfloat size): _size(size) {
-    #ifndef MAGNUM_TARGET_GLES
-    MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::texture_rg);
-    #else
-    MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::EXT::texture_rg);
-    #endif
-
-    /* Create FreeType font */
     CORRADE_INTERNAL_ASSERT_OUTPUT(FT_New_Face(renderer.library(), fontFile.c_str(), 0, &_ftFont) == 0);
+
+    finishConstruction();
+}
+
+Font::Font(FontRenderer& renderer, const unsigned char* data, std::size_t dataSize, GLfloat size): _size(size) {
+    CORRADE_INTERNAL_ASSERT_OUTPUT(FT_New_Memory_Face(renderer.library(), data, dataSize, 0, &_ftFont) == 0);
+
+    finishConstruction();
+}
+
+void Font::finishConstruction() {
     CORRADE_INTERNAL_ASSERT_OUTPUT(FT_Set_Char_Size(_ftFont, 0, _size*64, 100, 100) == 0);
 
     /* Create Harfbuzz font */
     _hbFont = hb_ft_font_create(_ftFont, nullptr);
 
+    #ifndef MAGNUM_TARGET_GLES
+    MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::texture_rg);
+    #else
+    MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::EXT::texture_rg);
+    #endif
+
     /* Set up the texture */
     _texture.setWrapping(Texture2D::Wrapping::ClampToEdge)
         ->setMinificationFilter(Texture2D::Filter::LinearInterpolation)

src/Text/Font.h

@@ -53,6 +53,15 @@ class MAGNUM_TEXT_EXPORT Font {
          */
         explicit Font(FontRenderer& renderer, const std::string& fontFile, GLfloat size);
 
+        /**
+         * @brief Create font from memory
+         * @param renderer      %Font renderer
+         * @param data          %Font data
+         * @param size          %Font data size
+         * @param size          %Font size
+         */
+        explicit Font(FontRenderer& renderer, const unsigned char* data, std::size_t dataSize, GLfloat size);
+
         /**
          * @brief Prerender given character set
          * @param characters    Characters to render
@@ -93,6 +102,7 @@ class MAGNUM_TEXT_EXPORT Font {
         inline hb_font_t* font() { return _hbFont; }
 
     private:
+        void MAGNUM_TEXT_LOCAL finishConstruction();
         void MAGNUM_TEXT_LOCAL destroy();
         void MAGNUM_TEXT_LOCAL move();