add: Basic Font Rendering

frame/src/render/RenderTarget.cpp

@@ -142,6 +142,46 @@ namespace frame::render
                        {BottomRight.x, BottomRight.y - lw});
     }
 
+    void RenderTarget::DrawImage(Vector topLeft, Image const& image)
+    {
+        auto pos = topLeft;
+
+        for(auto y = 0; y < image.getHeight(); ++y)
+        {
+            for(auto x = 0; x < image.getWidth(); ++x)
+            {
+                DrawPixel({pos.x + x, pos.y + y}, (Color)image.at(x, y));
+            }
+        }
+    }
+
+    Vector RenderTarget::DrawGlyph(Vector centerLine,
+                                   font::Glyph const& g,
+                                   Color color)
+    {
+        auto const& height = g.height;
+
+        Vector topleft = centerLine;
+        topleft.x += g.x_offset;
+        topleft.y += g.y_offset;
+
+        DrawImage(topleft, g.image);
+        centerLine.x += g.advance;
+        return centerLine;
+    }
+
+    void RenderTarget::DrawText(std::string_view pText,
+                                Vector pCenterLineStart,
+                                font::Font const& pFont,
+                                uint8_t size)
+    {
+        auto pos = pCenterLineStart;
+        for(auto c : pText)
+        {
+            pos = DrawGlyph(pos, pFont.getGlyph(size, c));
+        }
+    }
+
     void RenderTarget::DrawPointsMirrorCircle(Vector const& center,
                                               Vector const& pos,
                                               Color color)