Add initial font metrics and equation rendering.

src/base/core/encoding/UnicodeUtils.cpp

@@ -39,3 +39,53 @@ std::wstring UnicodeUtils::utf8ToUtf16WString(const std::string& input)
     throw std::logic_error("Not implemented");
 #endif
 }
+
+std::vector<uint32_t> UnicodeUtils::utf8ToUtf32(const std::string& input)
+{
+    const auto utf_16 = utf8ToUtf16WString(input);
+
+    std::vector<uint32_t> output;
+    std::size_t pos = 0;
+    while (pos < utf_16.size())
+    {
+        const auto c = utf_16[pos];
+        pos++;
+        if (!isSurrogate(c))
+        {
+            output.push_back(c);
+        }
+        else
+        {
+            if (isHighSurrogate(c) && pos < utf_16.size() && isLowSurrogate(utf_16[pos]))
+            {
+                output.push_back(surrogateToUtf32(c, utf_16[pos]));
+                pos++;
+            }
+            else
+            {
+                throw std::logic_error("Unexpected UTF16 content given for conversion to UTF32");
+            }
+        }
+    }
+    return output;
+}
+
+bool UnicodeUtils::isSurrogate(wchar_t c)
+{ 
+    return (c - 0xd800u) < 2048u; 
+}
+
+bool UnicodeUtils::isHighSurrogate(wchar_t c)
+{
+    return (c & 0xfffffc00) == 0xd800;
+}
+
+bool UnicodeUtils::isLowSurrogate(wchar_t c)
+{
+    return (c & 0xfffffc00) == 0xdc00;
+}
+
+uint32_t UnicodeUtils::surrogateToUtf32(wchar_t high, wchar_t low)
+{
+    return (high << 10) + low - 0x35fdc00;
+}

src/base/core/encoding/UnicodeUtils.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <string>
+#include <vector>
 
 class UnicodeUtils
 {
@@ -8,4 +9,12 @@ public:
 	static std::string utf16ToUtf8String(const std::wstring& input);
 
 	static std::wstring utf8ToUtf16WString(const std::string& input);
+
+	static std::vector<uint32_t> utf8ToUtf32(const std::string& input);
+
+private:
+	static bool isSurrogate(wchar_t c);
+	static bool isHighSurrogate(wchar_t c);
+	static bool isLowSurrogate(wchar_t c);
+	static uint32_t surrogateToUtf32(wchar_t high, wchar_t low);
 };

src/publishing/latex/LatexMathExpression.cpp

@@ -0,0 +1,245 @@
+#include "LatexMathExpression.h"
+
+#include "FileLogger.h"
+
+LatexMathExpression::LatexMathExpression(const std::string& expression)
+	: mRawBody(expression),
+		mType(Type::LINEAR)
+{
+	MLOG_INFO("Adding expression with content: " << expression);
+	parse();
+}
+
+LatexMathExpression::LatexMathExpression(Type type)
+	: mType(type)
+{
+
+}
+
+LatexMathExpression::~LatexMathExpression()
+{
+
+}
+
+void LatexMathExpression::onTagBodyChar(char c)
+{
+	if (c == '}')
+	{
+		onRBrace();
+	}
+	else
+	{
+		mWorkingString += c;
+	}
+}
+
+void LatexMathExpression::onFreeChar(char c)
+{
+	if (c == '\\')
+	{
+		mLineState = LineState::IN_TAG_NAME;
+	}
+	else if (c == '{')
+	{
+		onLBrace();
+	}
+	else if (c == '}')
+	{
+		onRBrace();
+	}
+	else if (c == '^')
+	{
+		onSuperscript();
+	}
+	else if (c == '_')
+	{
+		onSubscript();
+	}
+	else if (std::isblank(c))
+	{
+		onSpace();
+	}
+	else
+	{
+		mWorkingString += c;
+	}
+}
+
+void LatexMathExpression::parse()
+{
+	mLineState = LineState::NONE;
+	mWorkingString.clear();
+
+	for (auto c : mRawBody)
+	{
+		if (mLineState == LineState::IN_TAG_BODY)
+		{
+			onTagBodyChar(c);
+		}
+		else
+		{
+			onFreeChar(c);
+		}
+	}
+	onSpace();
+	onCloseExpression();
+}
+
+void LatexMathExpression::onSpace()
+{
+	if (mLineState == LineState::IN_TAG_NAME)
+	{
+		onFinishedTagName();
+	}
+	else
+	{
+		onLiteral();
+	}
+	mWorkingString.clear();
+}
+
+void LatexMathExpression::onLBrace()
+{
+	if (mLineState == LineState::IN_TAG_NAME)
+	{
+		onFinishedTagName();
+	}
+	else if (mLineState == LineState::AWAITING_LBRACE)
+	{
+		mLineState = LineState::IN_TAG_BODY;
+	}
+	else if (mLineState == LineState::IN_TAG_BODY)
+	{
+		mOpenBraceCount++;
+	}
+	else
+	{
+		mWorkingString += "{";
+	}
+}
+
+void LatexMathExpression::onRBrace()
+{
+	if (mLineState == LineState::IN_TAG_BODY)
+	{
+		if (mOpenBraceCount == 0)
+		{
+			onTagBody();
+		}
+		else
+		{
+			mOpenBraceCount--;
+			mWorkingString += "}";
+		}
+	}
+	else
+	{
+		mWorkingString += "}";
+	}
+}
+
+void LatexMathExpression::setRawContent(const std::string& content)
+{
+	auto expression = std::make_unique<LatexMathExpression>(content);
+	mExpressions.push_back(std::move(expression));
+}
+
+void LatexMathExpression::onTagBody()
+{
+	onCloseExpression();
+}
+
+void LatexMathExpression::onSuperscript()
+{
+
+}
+
+void LatexMathExpression::onSubscript()
+{
+
+}
+
+void LatexMathExpression::onLiteral()
+{
+	LatexMathSymbol symbol{ LatexMathSymbol::Type::RAW, mWorkingString, mWorkingString };
+	mWorkingSymbols.push_back(symbol);
+}
+
+void LatexMathExpression::onFinishedTagName()
+{
+	if (auto lookup = LatexSymbolLookup::getKnownTag(mWorkingString); lookup)
+	{
+		if (mLineState == LineState::AWAITING_LBRACE || mLineState == LineState::IN_TAG_NAME)
+		{
+			onCloseExpression();
+
+			if (*lookup == LatexMathSymbol::Tag::FRAC)
+			{
+				mWorkingType = Type::FRACTION;
+				auto expression = std::make_unique<LatexMathExpression>(mWorkingType);
+				mWorkingExpression = expression.get();
+				mExpressions.push_back(std::move(expression));
+				mWorkingString.clear();
+			}
+
+			mLineState = LineState::IN_TAG_BODY;		
+		}
+	}
+	else if (auto lookup = LatexSymbolLookup::getSymbolUtf8(mWorkingString); lookup)
+	{
+		LatexMathSymbol symbol{ LatexMathSymbol::Type::TAG, mWorkingString, *lookup };
+		mWorkingSymbols.push_back(symbol);
+		mLineState = LineState::NONE;
+	}
+}
+
+void LatexMathExpression::onCloseExpression()
+{
+	if (mWorkingType == Type::LEAF)
+	{
+		if (!mWorkingSymbols.empty())
+		{
+			auto expression = std::make_unique<LatexMathExpression>(mWorkingType);
+			expression->setContent(mWorkingSymbols);
+			mExpressions.push_back(std::move(expression));
+		}
+	}
+	else if (mWorkingType == Type::FRACTION)
+	{
+		mWorkingExpression->setRawContent(mWorkingString);
+
+		if (mWorkingExpression->getExpressions().size() == 2)
+		{
+			mWorkingType = Type::LEAF;
+			mLineState = LineState::NONE;
+		}
+		else
+		{
+			mLineState = LineState::AWAITING_LBRACE;
+			mOpenBraceCount = 0;
+		}
+	}
+
+	mWorkingString.clear();
+	mWorkingSymbols.clear();
+}
+
+void LatexMathExpression::setContent(std::vector<LatexMathSymbol>& symbols)
+{
+	mSymbols = symbols;
+}
+
+const std::vector<LatexMathSymbol>& LatexMathExpression::getSymbols() const
+{
+	return mSymbols;
+}
+
+const LatexMathExpression::Type LatexMathExpression::getType() const
+{
+	return mType;
+}
+
+const std::vector<LatexMathExpressionPtr>& LatexMathExpression::getExpressions() const
+{
+	return mExpressions;
+}

src/publishing/latex/LatexMathExpression.h

@@ -6,36 +6,81 @@
 #include <memory>
 #include <vector>
 
+class LatexMathExpression;
+using LatexMathExpressionPtr = std::unique_ptr<LatexMathExpression>;
+
 class LatexMathExpression
 {
 public:
-	LatexMathExpression(const std::string& expression = {})
-		: mRawExpression(expression)
+	enum class Type
 	{
+		LINEAR,
+		LEAF,
+		FRACTION,
+		SUBSCRIPT,
+		SUPERSCRIPT
+	};
 
-	}
-
-	void parse()
+	enum class LineState
 	{
-		for (auto c : mRawExpression)
-		{
+		NONE,
+		IN_TAG_NAME,
+		AWAITING_LBRACE,
+		IN_TAG_BODY
+	};
 
-		}
-	}
+	LatexMathExpression(const std::string& expression);
 
-	const std::vector<LatexMathSymbol>& getSymbols() const
-	{
-		return mSymbols;
-	}
+	LatexMathExpression(Type type);
+
+	~LatexMathExpression();
+
+	const std::vector<LatexMathSymbol>& getSymbols() const;
+
+	const std::vector<LatexMathExpressionPtr>& getExpressions() const;
+
+	const Type getType() const;
+
+	void setContent(std::vector<LatexMathSymbol>& symbols);
+
+	void setRawContent(const std::string& content);
+
+	void onTagBodyChar(char c);
+
+	void onFreeChar(char c);
+
+	void onSpace();
+
+	void onLBrace();
+
+	void onRBrace();
+
+	void onSuperscript();
+
+	void onSubscript();
+
+	void onLiteral();
+
+	void onTagBody();
+
+	void onFinishedTagName();
+
+	void onCloseExpression();
+
+	void parse();
 
 private:
+	std::size_t mOpenBraceCount{ 0 };
 
-	unsigned mOpenTagCount{ 0 };
+	LineState mLineState{ LineState::NONE };
+	std::string mWorkingString;
+	std::string mRawBody;
 
-	std::string mRawExpression;
-	std::unique_ptr<LatexMathExpression> mSuperScriptExpr;
-	std::unique_ptr<LatexMathExpression> mSubScriptExpr;
-	std::unique_ptr<LatexMathExpression> mEnclosedExpr;
+	Type mWorkingType{ Type::LEAF };
+	LatexMathExpression* mWorkingExpression{ nullptr };
+	Type mType{ Type::LEAF };
+	std::vector<LatexMathSymbol> mWorkingSymbols;
 
 	std::vector<LatexMathSymbol> mSymbols;
+	std::vector<LatexMathExpressionPtr> mExpressions;
 };

src/publishing/latex/LatexSymbols.cpp

@@ -10,6 +10,11 @@ std::unordered_map<std::string, std::wstring> LatexSymbolLookup::mSymbols = {
 	{"psi", L"\u03C8"}
 };
 
+
+std::unordered_map<std::string, LatexMathSymbol::Tag> LatexSymbolLookup::mTags = {
+	{"frac", LatexMathSymbol::Tag::FRAC},
+};
+
 std::optional<std::string> LatexSymbolLookup::getSymbolUtf8(const std::string& tag)
 {
 	if (auto entry = getSymbolUtf16(tag); entry)
@@ -33,3 +38,15 @@ std::optional<std::wstring> LatexSymbolLookup::getSymbolUtf16(const std::string&
 		return std::nullopt;
 	}
 }
+
+std::optional<LatexMathSymbol::Tag> LatexSymbolLookup::getKnownTag(const std::string& tag)
+{
+	if (auto iter = mTags.find(tag); iter != mTags.end())
+	{
+		return iter->second;
+	}
+	else
+	{
+		return std::nullopt;
+	}
+}

src/publishing/latex/LatexSymbols.h

@@ -15,8 +15,24 @@ struct LatexMathSymbol
 		ENCLOSING,
 		ENCLOSING_TAG
 	};
+
+	enum class Tag
+	{
+		NONE,
+		FRAC
+	};
+
+	LatexMathSymbol(Type type, const std::string& name, const std::string& unicode)
+		:	mType(type),
+			mName(name),
+			mUnicode(unicode)
+	{
+
+	}
+
+	Type mType{ Type::RAW };
 	std::string mName;
-	std::wstring mUnicode;
+	std::string mUnicode;
 };
 
 class LatexSymbolLookup
@@ -26,6 +42,21 @@ public:
 
 	static std::optional<std::wstring> getSymbolUtf16(const std::string& tag);
 
+	static std::optional<LatexMathSymbol::Tag> getKnownTag(const std::string& tag);
+
+	static std::size_t getNumTagBodies(LatexMathSymbol::Tag tag)
+	{
+		switch (tag)
+		{
+		case LatexMathSymbol::Tag::FRAC:
+			return 2;
+		default:
+			return 1;
+		}
+	}
+
 private:
 	static std::unordered_map<std::string, std::wstring> mSymbols;
+
+	static std::unordered_map<std::string, LatexMathSymbol::Tag> mTags;
 };

src/publishing/plotting/EquationNode.cpp

@@ -1,7 +1,83 @@
 #include "EquationNode.h"
 
+#include "LatexMathExpression.h"
+#include "TextNode.h"
+
+#include "FileLogger.h"
+
 EquationNode::EquationNode(const Transform& t)
 	: AbstractVisualNode(t)
 {
 
 }
+
+EquationNode::~EquationNode()
+{
+
+}
+
+void EquationNode::setContent(LatexMathExpression* content)
+{
+	mContent = content;
+	mContentDirty = true;
+}
+
+void EquationNode::update(SceneInfo* sceneInfo)
+{
+    if (mContentDirty)
+    {
+        createOrUpdateGeometry(sceneInfo);
+        mContentDirty = false;
+    }
+}
+
+void EquationNode::addExpression(const LatexMathExpression* expression)
+{
+    if (expression->getType() == LatexMathExpression::Type::LINEAR)
+    {
+        MLOG_INFO("Processing linear expr with : " << expression->getExpressions().size() << " children");
+        for (const auto& expression : expression->getExpressions())
+        {
+            addExpression(expression.get());
+        }
+    }
+    else if(expression->getType() == LatexMathExpression::Type::LEAF)
+    {
+        std::string content = "_";
+        for (const auto& symbol : expression->getSymbols())
+        {
+            content += symbol.mUnicode;
+        }
+        MLOG_INFO("Processing leaf expr with content: " << content);
+        auto node = std::make_unique<TextNode>(content, Transform(mTextCursor));
+        node->setWidth(100);
+        node->setFont(mDefaultFont);
+        addChild(node.get());
+        mText.push_back(std::move(node));
+
+        mTextCursor.move(20.0, 0.0);
+    }
+    else if (expression->getType() == LatexMathExpression::Type::FRACTION)
+    {
+        MLOG_INFO("Processing frac expr");
+        if (expression->getExpressions().size() == 2)
+        {
+            auto x_cache = mTextCursor.getX();
+            mTextCursor.move(0.0, -10.0);
+            addExpression(expression->getExpressions()[0].get());
+
+            mTextCursor.move(mTextCursor.getX() - x_cache, 20.0);
+            addExpression(expression->getExpressions()[1].get());
+
+            mTextCursor.move(0.0, -10.0);
+        }
+    }
+}
+
+void EquationNode::createOrUpdateGeometry(SceneInfo* sceneInfo)
+{
+    mChildren.clear();
+    mText.clear();
+
+    addExpression(mContent);
+}

src/publishing/plotting/EquationNode.h

@@ -1,9 +1,35 @@
 #pragma once
 
 #include "AbstractVisualNode.h"
+#include "FontItem.h"
+
+class TextNode;
+class LatexMathExpression;
 
 class EquationNode : public AbstractVisualNode
 {
 public:
 	EquationNode(const Transform& t = {});
+
+	virtual ~EquationNode();
+
+	void setContent(LatexMathExpression* content);
+
+	void update(SceneInfo* sceneInfo) override;
+
+protected:
+	void createOrUpdateGeometry(SceneInfo* sceneInfo);
+
+	void addExpression(const LatexMathExpression* expression);
+
+
+	std::vector<std::unique_ptr<TextNode> > mText;
+
+	FontItem mDefaultFont{ "Cambria Math", 14 };
+	//FontItem mDefaultFont{ "Latin Modern Math", 14 };
+
+	Point mTextCursor;
+
+	LatexMathExpression* mContent{ nullptr };
+	bool mContentDirty{ true };
 };

src/rendering/fonts/BasicFontEngine.h

@@ -12,4 +12,9 @@ class BasicFontEngine : public IFontEngine
     virtual void loadFontFace(const std::filesystem::path&, float){};
 
     virtual std::unique_ptr<FontGlyph> loadGlyph(unsigned){return nullptr;};
+
+    double getHorizontalAdvance(const FontItem& fontItem, const std::string& content) override
+    {
+        return 0.0;
+    }
 };

src/rendering/fonts/FontsManager.cpp

@@ -1,20 +1,29 @@
 #include "FontsManager.h"
 
-#ifdef HAS_FREETYPE
-#include "FreeTypeFontEngine.h"
+#ifdef _WIN32
+    #include "DirectWriteFontEngine.h"
+    #include "DirectWriteHelpers.h"
 #else
-#include "BasicFontEngine.h"
+    #ifdef HAS_FREETYPE
+    #include "FreeTypeFontEngine.h"
+    #else
+    #include "BasicFontEngine.h"
+    #endif
 #endif
 
 #include "FontGlyph.h"
 
 FontsManager::FontsManager()
 {
-#ifdef HAS_FREETYPE
-    mFontEngine = std::make_unique<FreeTypeFontEngine>();
-    mUsesGlyphs = true;
+#ifdef _WIN32
+    mFontEngine = std::make_unique<DirectWriteFontEngine>();
 #else
-    mFontEngine = std::make_unique<BasicFontEngine>();
+    #ifdef HAS_FREETYPE
+        mFontEngine = std::make_unique<FreeTypeFontEngine>();
+        mUsesGlyphs = true;
+    #else
+        mFontEngine = std::make_unique<BasicFontEngine>();
+    #endif
 #endif
     mFontEngine->initialize();
 }

src/rendering/fonts/IFontEngine.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "FontItem.h"
+
 #include <memory>
 #include <filesystem>
 
@@ -16,4 +18,6 @@ public:
     virtual void loadFontFace(const std::filesystem::path& fontFile, float penSize = 16) = 0;
 
     virtual std::unique_ptr<FontGlyph> loadGlyph(uint32_t charCode) = 0;
+
+    virtual double getHorizontalAdvance(const FontItem& fontItem, const std::string& content) = 0;
 };

src/rendering/fonts/directx/DirectWriteFontEngine.cpp

@@ -4,8 +4,10 @@
 #include "UnicodeUtils.h"
 
 #include "DirectWriteHelpers.h"
+#include "FileLogger.h"
 
 #include <dwrite.h>
+#include <cmath>
 
 void DirectWriteFontEngine::initialize()
 {
@@ -35,6 +37,83 @@ std::unique_ptr<FontGlyph> DirectWriteFontEngine::loadGlyph(uint32_t charCode)
 	return nullptr;
 }
 
+IDWriteFontFamily* DirectWriteFontEngine::getSystemFontFamily(const std::string& fontName)
+{
+    if (auto iter = mSystemFontFamilies.find(fontName); iter != mSystemFontFamilies.end())
+    {
+        return iter->second.Get();
+    }
+    else
+    {
+        loadSystemFontFamily(fontName);
+        if (auto iter = mSystemFontFamilies.find(fontName); iter != mSystemFontFamilies.end())
+        {
+            return iter->second.Get();
+        }
+        else
+        {
+            return nullptr;
+        }
+    }
+}
+
+bool DirectWriteFontEngine::loadSystemFontFamily(const std::string& fontName)
+{
+    Microsoft::WRL::ComPtr<IDWriteFontCollection> system_collection;
+    if (SUCCEEDED(mDWriteFactory->GetSystemFontCollection(&system_collection, FALSE)))
+    {
+        UINT32 index{ 0 };
+        BOOL exists{ false };
+        system_collection->FindFamilyName(UnicodeUtils::utf8ToUtf16WString(fontName).c_str(), &index, &exists);
+        if (exists)
+        {
+            Microsoft::WRL::ComPtr<IDWriteFontFamily> font_family;
+            if (SUCCEEDED(system_collection->GetFontFamily(index, &font_family)))
+            {
+                mSystemFontFamilies[fontName] = font_family;
+                return true;
+            }
+        }
+    }
+    return false;
+};
+
+IDWriteFontFace* DirectWriteFontEngine::getDefaultFontFace(const std::string& fontName)
+{
+    if (auto iter = mDefaultFontFaces.find(fontName); iter != mDefaultFontFaces.end())
+    {
+        return iter->second.Get();
+    }
+    else
+    {
+        loadDefaultFontFace(fontName);
+        if (auto iter = mDefaultFontFaces.find(fontName); iter != mDefaultFontFaces.end())
+        {
+            return iter->second.Get();
+        }
+        else
+        {
+            return nullptr;
+        }
+    }
+}
+
+bool DirectWriteFontEngine::loadDefaultFontFace(const std::string& fontName)
+{
+    if (auto family = getSystemFontFamily(fontName); family)
+    {
+        Microsoft::WRL::ComPtr<IDWriteFont> font;
+        if (SUCCEEDED(family->GetFirstMatchingFont(DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL, &font)))
+        {
+            Microsoft::WRL::ComPtr<IDWriteFontFace> font_face;
+            font->CreateFontFace(&font_face);
+            mDefaultFontFaces[fontName] = font_face;
+            return true;
+        }
+    };
+    return false;
+}
+
 std::unique_ptr<GlyphRunOutlines> DirectWriteFontEngine::getGlyphRunOutlines(const std::vector<uint32_t>& charCodes)
 {
     initializeOffScreenRenderer();
@@ -52,3 +131,42 @@ std::unique_ptr<GlyphRunOutlines> DirectWriteFontEngine::getGlyphRunOutlines(con
     return mOffScreenRenderer->getGlypyRunOutline();
 }
 
+double DirectWriteFontEngine::getHorizontalAdvance(const FontItem& fontItem, const std::string& content)
+{
+    auto font_face = getDefaultFontFace(fontItem.getFaceName());
+    if (!font_face)
+    {
+        return 0;
+    }
+
+    DWRITE_FONT_METRICS font_metrics;
+    font_face->GetMetrics(&font_metrics);
+
+    const auto design_per_em = font_metrics.designUnitsPerEm;
+    MLOG_INFO("Design units: " << design_per_em);
+
+    const auto utf32_content = UnicodeUtils::utf8ToUtf32(content);
+
+    std::vector<UINT16> glyph_indices(utf32_content.size());
+    if (SUCCEEDED(font_face->GetGlyphIndices(utf32_content.data(), static_cast<UINT32>(utf32_content.size()), &glyph_indices[0])))
+    {
+        std::vector<DWRITE_GLYPH_METRICS> metrics(utf32_content.size());
+        double total_advance{ 0 };
+        if (SUCCEEDED(font_face->GetDesignGlyphMetrics(glyph_indices.data(), static_cast<UINT32>(glyph_indices.size()), &metrics[0], false)))
+        {
+            for (std::size_t idx = 0; idx < utf32_content.size(); idx++)
+            {
+                const auto design_width = metrics[idx].advanceWidth;
+                // https://learn.microsoft.com/en-us/windows/win32/gdi/device-vs--design-units
+                double device_width = (design_width / static_cast<double>(design_per_em)) * (fontItem.getSize() / 72.0) * 96.0 * 0.75;
+
+                MLOG_INFO("Got advance width: " << device_width);
+                //total_advance += std::floor(device_width);
+                total_advance += device_width;
+            }
+            return std::round(total_advance);
+        }
+    }
+    return 0;
+}
+

src/rendering/fonts/directx/DirectWriteFontEngine.h

@@ -2,10 +2,12 @@
 
 #include "IFontEngine.h"
 #include "FontGlyph.h"
+#include "FontItem.h"
 
 #include <wrl.h>
 
 #include <vector>
+#include <unordered_map>
 
 class GlyphOutlineGeometrySink;
 class OffScreenTextRenderer;
@@ -13,6 +15,8 @@ class OffScreenTextRenderer;
 struct IDWriteFactory;
 struct IDWriteTextFormat;
 struct IDWriteTextLayout;
+struct IDWriteFontFace;
+struct IDWriteFontFamily;
 
 class DirectWriteFontEngine : public IFontEngine
 {
@@ -27,10 +31,24 @@ public:
 
     std::unique_ptr<GlyphRunOutlines> getGlyphRunOutlines(const std::vector<uint32_t>& charCodes);
 
+    IDWriteFontFamily* getSystemFontFamily(const std::string& fontName);
+
+    bool loadSystemFontFamily(const std::string& fontName);
+
+    IDWriteFontFace* getDefaultFontFace(const std::string& fontName);
+
+    bool loadDefaultFontFace(const std::string& fontName);
+
+    double getHorizontalAdvance(const FontItem& fontItem, const std::string& content) override;
+
 private:
     void initializeOffScreenRenderer();
 
     bool mIsValid{ false };
+
+    std::unordered_map<std::string, Microsoft::WRL::ComPtr<IDWriteFontFace> > mDefaultFontFaces;
+    std::unordered_map<std::string, Microsoft::WRL::ComPtr<IDWriteFontFamily> > mSystemFontFamilies;
+
     Microsoft::WRL::ComPtr<IDWriteFactory> mDWriteFactory;
     Microsoft::WRL::ComPtr<IDWriteTextFormat> mTextFormat;
     Microsoft::WRL::ComPtr<IDWriteTextLayout> mTextLayout;

src/rendering/visual_elements/nodes/TextNode.cpp

@@ -9,6 +9,8 @@
 #include "SceneInfo.h"
 
 #include "SceneText.h"
+#include "SceneModel.h"
+#include "Rectangle.h"
 
 #include "Color.h"
 
@@ -18,6 +20,8 @@ TextNode::TextNode(const std::string& content, const Transform& transform)
     :   MaterialNode(transform)
 {
     mTextData.mContent= content;
+    setFillColor(Color(0, 0, 0));
+    setHasStrokeColor(false);
 }
 
 TextNode::~TextNode()
@@ -92,15 +96,39 @@ SceneItem* TextNode::getSceneItem(std::size_t idx) const
     {
         return mTextItem.get();
     }
-    else
+    else if (idx == 1)
     {
-        return 0;
+        if (mNodeBounds)
+        {
+            return mNodeBounds.get();
+        }
+        else
+        {
+            return mTextBounds.get();
+        }
     }
+    else if (idx == 2)
+    {
+        if (mTextBounds)
+        {
+            return mTextBounds.get();
+        }
+    }
+    return nullptr;
 }
 
 std::size_t TextNode::getNumSceneItems() const
 {
-    return 1;
+    auto count = 1;
+    if (mNodeBounds)
+    {
+        count++;
+    }
+    if (mTextBounds)
+    {
+        count++;
+    }
+    return count;
 }
 
 void TextNode::updateLines(FontsManager* fontsManager)
@@ -145,12 +173,58 @@ void TextNode::updateLines(FontsManager* fontsManager)
     }
 }
 
+void TextNode::setRenderNodeBounds(bool render)
+{
+    mRenderNodeBounds = render;
+}
+
+void TextNode::setRenderTextBounds(bool render)
+{
+    mRenderTextBounds = render;
+}
+
 void TextNode::update(SceneInfo* sceneInfo)
 {
     if (!mTextItem)
     {
         mTextItem = std::make_unique<SceneText>();
         mTextItem->setName(mName + "_SceneText");
+
+        mContentWidth = sceneInfo->mFontsManager->getFontEngine()->getHorizontalAdvance(mTextData.mFont, mTextData.mContent);
+        mContentHeight = mTextData.mFont.getSize();
+
+        if (mWidth == 1.0 && mHeight == 1.0)
+        {
+            mTextItem->setTextWidth(mContentWidth);
+            mTextItem->setTextHeight(mContentHeight);
+        }
+        else
+        {
+            mTextItem->setTextWidth(mWidth);
+            mTextItem->setTextHeight(mHeight);
+        }
+
+        if (mRenderNodeBounds)
+        {
+            auto rect = std::make_unique<ntk::Rectangle>(Point(0.0, 0.0), mWidth, mHeight);
+            mNodeBounds = std::make_unique<SceneModel>();
+            mNodeBounds->updateGeometry(std::move(rect));
+
+            BasicMaterial bounds_material;
+            bounds_material.setStrokeColor(Color(255, 0, 0));
+            mNodeBounds->updateSolidMaterial(bounds_material);
+        }
+
+        if (mRenderTextBounds)
+        {
+            auto rect = std::make_unique<ntk::Rectangle>(Point(0.0, 0.0), mContentWidth, mContentHeight);
+            mTextBounds = std::make_unique<SceneModel>();
+            mTextBounds->updateGeometry(std::move(rect));
+
+            BasicMaterial bounds_material;
+            bounds_material.setStrokeColor(Color(0, 255, 0));
+            mTextBounds->updateSolidMaterial(bounds_material);
+        }
     }
 
     if (mTransformIsDirty || mContentIsDirty)
@@ -167,9 +241,16 @@ void TextNode::update(SceneInfo* sceneInfo)
 
     if (mTransformIsDirty)
     {
-        //mTextItem->updateTransform({mLocation});
-        mTextItem->setTextWidth(mWidth);
-        mTextItem->setTextHeight(mHeight);
+        if (mWidth == 1.0 && mHeight == 1.0)
+        {
+            mTextItem->setTextWidth(mContentWidth);
+            mTextItem->setTextHeight(mContentHeight);
+        }
+        else
+        {
+            mTextItem->setTextWidth(mWidth);
+            mTextItem->setTextHeight(mHeight);
+        }
         mTransformIsDirty = false;
     }
 

src/rendering/visual_elements/nodes/TextNode.h

@@ -11,6 +11,7 @@
 #include <string>
 
 class FontsManager;
+class SceneModel;
 
 class TextNode : public MaterialNode
 {
@@ -34,9 +35,11 @@ public:
     void setHeight(double height);
 
     void setContent(const std::string& content);
-
     void setFont(const FontItem& font);
 
+    void setRenderNodeBounds(bool render);
+    void setRenderTextBounds(bool render);
+
     void update(SceneInfo* sceneInfo) override;
 private:
 
@@ -49,7 +52,15 @@ private:
     double mWidth{1};
     double mHeight{1};
 
+    double mContentWidth{ 1 };
+    double mContentHeight{ 1 };
+
     std::unique_ptr<SceneText> mTextItem;
+
+    bool mRenderNodeBounds{ false };
+    bool mRenderTextBounds{ false };
+    std::unique_ptr<SceneModel> mNodeBounds;
+    std::unique_ptr<SceneModel> mTextBounds;
 };
 
 using TextNodetr = std::unique_ptr<TextNode>;

src/rendering/visual_elements/svg/SvgPainter.cpp

@@ -235,11 +235,9 @@ void SvgPainter::paintText(SvgDocument* document, SceneText* text) const
 {
     auto svg_text = std::make_unique<SvgTextElement>();
     svg_text->setContent(text->getTextData().mContent);
-    auto loc = text->getTransform().getLocation();
-
-    loc.move(text->getTextWidth() / 2.0, text->getTextHeight()/2.0);
-    svg_text->setLocation(loc);
     
+    Point centre(text->getTextWidth() / 2.0, text->getTextHeight() / 2.0);
+    svg_text->setLocation(centre);
     svg_text->setFontFamily(text->getTextData().mFont.getFaceName());
 
     svg_text->setFill(text->getSolidMaterial().getFillColor());
@@ -248,9 +246,14 @@ void SvgPainter::paintText(SvgDocument* document, SceneText* text) const
     {
         svg_text->setFillOpacity(opacity);
     }
-
     svg_text->setFontSize(text->getTextData().mFont.getSize());
 
+    const auto transform = text->getTransform();
+    if (!transform.isDefaultTransform())
+    {
+        svg_text->addAttribute(toTransform(transform));
+    }
+
     document->getRoot()->addChild(std::move(svg_text));
 }
 

test/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_subdirectory(test_utils)
 
+add_subdirectory(fonts)
 add_subdirectory(geometry)
 add_subdirectory(graphics)
 add_subdirectory(publishing)
@@ -13,7 +14,6 @@ set(TEST_MODULES
     compression 
     core 
     database 
-    fonts 
     image 
     ipc 
     network 

test/fonts/CMakeLists.txt

@@ -4,23 +4,24 @@ if(UNIX)
     find_package(Freetype QUIET)
     if(Freetype_FOUND)
     set(PLATFORM_UNIT_TEST_FILES
-        fonts/TestFreeTypeFontEngine.cpp
+        TestFreeTypeFontEngine.cpp
     )    
     endif()
 else()
     set(PLATFORM_UNIT_TEST_FILES
-        fonts/TestDirectWriteFontEngine.cpp
+        TestDirectWriteFontEngine.cpp
     )    
 endif()
 	
+set(MODULE_NAME fonts)
 
-set(FONTS_UNIT_TEST_FILES 
-        fonts/TestFontReader.cpp
-        ${PLATFORM_UNIT_TEST_FILES}
-    PARENT_SCOPE
-    )
+list(APPEND UNIT_TEST_FILES
+    TestFontReader.cpp
+	${PLATFORM_UNIT_TEST_FILES}
+)
 
-set(FONTS_UNIT_TEST_DEPENDENCIES 
-        fonts
-    PARENT_SCOPE
-    )
+set(UNIT_TEST_TARGET_NAME ${MODULE_NAME}_unit_tests)
+
+add_executable(${UNIT_TEST_TARGET_NAME} ${CMAKE_SOURCE_DIR}/test/test_runner.cpp ${UNIT_TEST_FILES})
+target_link_libraries(${UNIT_TEST_TARGET_NAME} PUBLIC test_utils fonts)
+set_property(TARGET ${UNIT_TEST_TARGET_NAME} PROPERTY FOLDER test/${MODULE_NAME})

test/fonts/TestDirectWriteFontEngine.cpp

@@ -9,6 +9,7 @@
 #include "SvgWriter.h"
 #include "SvgShapeElements.h"
 #include "File.h"
+#include "FontItem.h"
 
 TEST_CASE(TestDirectWriteFontEngine, "fonts")
 {
@@ -34,3 +35,16 @@ TEST_CASE(TestDirectWriteFontEngine, "fonts")
 	file.writeText(doc_string);
 
 }
+
+TEST_CASE(TestDirectWriteFontEngine_GlyphMetrics, "fonts")
+{
+	DirectWriteFontEngine font_engine;
+	font_engine.initialize();
+
+	FontItem font("Verdana", 16);
+
+	const auto advance = font_engine.getHorizontalAdvance(font, "abc");
+	MLOG_INFO("Advance is: " << advance);
+
+	REQUIRE(advance != 0.0);
+}

test/graphics/CMakeLists.txt

@@ -23,6 +23,7 @@ endif()
 
 set(UNIT_TEST_FILES 
     TestRasterizer.cpp
+	TestTextRendering.cpp
     ${PLATFORM_UNIT_TEST_FILES}
     )
 

test/graphics/TestTextRendering.cpp

@@ -0,0 +1,22 @@
+#include "TestFramework.h"
+#include "TestUtils.h"
+#include "TestRenderUtils.h"
+
+#include "TextNode.h"
+
+TEST_CASE(TestTextRendeing_WithBoundingBoxes, "graphics")
+{
+	TestRenderer renderer(800, 800);
+
+	auto loc = Point(10, 10);
+
+	TextNode text_node("abcdefgh", Transform(loc));
+	text_node.setRenderNodeBounds(true);
+	text_node.setRenderTextBounds(true);
+
+	auto scene = renderer.getScene();
+	scene->addNode(&text_node);
+
+	renderer.writeSvg(TestUtils::getTestOutputDir(__FILE__) / "text_with_bounding_box.svg");
+	renderer.write(TestUtils::getTestOutputDir(__FILE__) / "text_with_bounding_box.png");
+};

test/publishing/TestLatexConverter.cpp

@@ -4,13 +4,16 @@
 #include "TestRenderUtils.h"
 #include "StringUtils.h"
 
-#include "FontItem.h"
-#include "TextNode.h"
-#include "LatexSymbols.h"
+#include "EquationNode.h"
+#include "LatexMathExpression.h"
+
 
 TEST_CASE(TestLatexConverter, "publishing")
 {
-	FontItem font("Cambria Math", 14);
+	auto expression = std::make_unique<LatexMathExpression>("\\psi = \\frac{\\alpha + \\beta}{c}");
+
+	auto equation_node = std::make_unique<EquationNode>(Point(10, 10));
+	equation_node->setContent(expression.get());
 
 	auto psi = LatexSymbolLookup::getSymbolUtf8("psi");
 	auto alpha = LatexSymbolLookup::getSymbolUtf8("alpha");
@@ -20,10 +23,7 @@ TEST_CASE(TestLatexConverter, "publishing")
 
 	TestRenderer renderer(800, 800);
 
-	auto text = std::make_unique<TextNode>(content, Point(10, 10));
-	text->setFont(font);
-
-	renderer.getScene()->addNode(text.get());
-
+	renderer.getScene()->addNode(equation_node.get());
+	renderer.writeSvg(TestUtils::getTestOutputDir(__FILE__) / "out.svg");
 	renderer.write(TestUtils::getTestOutputDir(__FILE__) / "out.png");
 };

test/test_utils/TestCaseRunner.cpp

@@ -68,12 +68,23 @@ bool TestCaseRunner::run(const std::vector<std::string>& args)
         sLastTestFailed = false;
         std::cout << "TestFramework: Running Test - " << test_case->getName() << std::endl;
 
-        try{
+        try
+        {
             test_case->run();
         }
+        catch (const std::runtime_error& re)
+        {
+            std::cout << "Failed with runtime error: " << re.what() << std::endl;
+            mFailingTests.push_back(test_case->getName());
+        }
+        catch (const std::exception& e)
+        {
+            std::cout << "Failed with exception: " << e.what() << std::endl;
+            mFailingTests.push_back(test_case->getName());
+        }
         catch(...)
         {
-            std::cout << "Failed with exception" << std::endl;
+            std::cout << "Failed with unknown exception" << std::endl;
             mFailingTests.push_back(test_case->getName());
         };
 

test/test_utils/TestRenderUtils.h

@@ -12,6 +12,8 @@
 #include "Image.h"
 #include "PngWriter.h"
 
+#include "FontsManager.h"
+
 #include "File.h"
 
 class TestRenderer
@@ -19,10 +21,14 @@ class TestRenderer
 public:
 	TestRenderer(unsigned width = 1000, unsigned height = 1000)
 	{
+		mFontsManager = std::make_unique<FontsManager>();
+
 		mSurface = std::make_unique<DrawingSurface>();
 		mSurface->setSize(width, height);
 
 		mDrawingContext = std::make_unique<DrawingContext>(mSurface.get());
+
+		getScene()->setFontsManager(mFontsManager.get());
 	}
 
 	Scene* getScene() const
@@ -60,4 +66,6 @@ public:
 private:
 	std::unique_ptr<DrawingSurface> mSurface;
 	std::unique_ptr<DrawingContext> mDrawingContext;
+
+	std::unique_ptr<FontsManager> mFontsManager;
 };