Add getDeviceData and getBlock methods to Typeface

src/Asset.cpp

@@ -428,6 +428,14 @@ class ResourceGlyph : public GlyphObject
 
 /* ResourceTypeface */
 
+GlyphBlock ResourceTypeface::getBlock(unsigned index) const
+{
+	if(index < FSTR::readValue(&typeface.numBlocks)) {
+		return FSTR::readValue(&typeface.blocks[index]);
+	}
+	return GlyphBlock{};
+}
+
 bool ResourceTypeface::findGlyph(uint16_t codePoint, Resource::GlyphResource& glyph) const
 {
 	auto glyphPtr = typeface.glyphs;

src/include/Graphics/Asset.h

@@ -512,6 +512,7 @@ class TextOptions : public Meta
 	}
 };
 
+using GlyphBlock = Resource::GlyphBlock;
 using GlyphOptions = TextOptions;
 
 /**
@@ -522,6 +523,23 @@ class TypeFace : public AssetTemplate<AssetType::Typeface>
 public:
 	using AssetTemplate::AssetTemplate;
 
+	/**
+	 * @brief Return any device-specific information
+	 *
+	 * Controllers with internal fonts return private structures here to support rendering.
+	 */
+	virtual const void* getDeviceData() const
+	{
+		return nullptr;
+	}
+
+	/**
+	 * @brief Support enumeration of codepoint ranges
+	 * @param index Zero-based index of glyph block to return
+	 * @retval GlyphBlock
+	 */
+	virtual GlyphBlock getBlock(unsigned index) const = 0;
+
 	/**
 	 * @brief Style of this typeface (bold, italic, etc.)
 	 */
@@ -613,6 +631,8 @@ class ResourceTypeface : public Graphics::TypeFace
 	{
 	}
 
+	GlyphBlock getBlock(unsigned index) const override;
+
 	FontStyles getStyle() const override
 	{
 		Resource::TypefaceResource::Format format{

src/include/Graphics/LcdFont.h

@@ -46,6 +46,14 @@ class LcdGlyph : public GlyphObject
 class LcdTypeFace : public TypeFace
 {
 public:
+	GlyphBlock getBlock(unsigned index) const override
+	{
+		if(index == 0) {
+			return GlyphBlock{0, 255};
+		}
+		return GlyphBlock{};
+	}
+
 	FontStyles getStyle() const override
 	{
 		return 0;