More editbox functionality

PortabilityLayer/TextPlacer.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "Vec2i.h"
+
+class PLPasStr;
+
+namespace PortabilityLayer
+{
+	class RenderedFont;
+	struct RenderedGlyphMetrics;
+
+	struct GlyphPlacementCharacteristics
+	{
+		bool m_haveGlyph;
+		bool m_isParaStart;							// Character is the first character in the paragraph
+		bool m_isParaEnd;							// Character is the last character in the paragraph
+		const RenderedGlyphMetrics *m_glyphMetrics;	// Glyph metrics
+		const void *m_glyphData;					// Glyph data
+		Vec2i m_glyphStartPos;						// Glyph start position
+		Vec2i m_glyphEndPos;						// Glyph end position
+		unsigned int m_character;					// Character code
+		size_t m_characterIndex;					// Index in the input string
+	};
+
+	class TextPlacer
+	{
+	public:
+		TextPlacer(const Vec2i &basePoint, int32_t spanWidth, PortabilityLayer::RenderedFont *rfont, const PLPasStr &str);
+		~TextPlacer();
+
+		bool PlaceGlyph(GlyphPlacementCharacteristics &outCharacteristics);
+
+	private:
+		Vec2i m_basePoint;
+		Vec2i m_penPos;
+		Vec2i m_paraStartPos;
+		PortabilityLayer::RenderedFont *m_rfont;
+		const uint8_t *m_chars;
+		size_t m_length;
+
+		size_t m_currentStartChar;
+		size_t m_currentSpanLength;
+		size_t m_committedLength;
+		size_t m_emitOffset;
+		bool m_haveCommitted;
+
+		int32_t m_maxSpanWidth;
+	};
+}