From 1fea15ac7bb4533bc2e6a90b5a9661ce56430bb0 Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Tue, 17 Jan 2017 18:44:27 +0100
Subject: GRAPHICS: Implementing kerning calculation for MacFonts

---
 graphics/fonts/macfont.cpp | 86 ++++++++++++++++++++++++++++++++--------------
 graphics/fonts/macfont.h   | 27 ++++++++++-----
 2 files changed, 80 insertions(+), 33 deletions(-)

diff --git a/graphics/fonts/macfont.cpp b/graphics/fonts/macfont.cpp
index 0df5fa7aa0..92b68b4f6d 100644
--- a/graphics/fonts/macfont.cpp
+++ b/graphics/fonts/macfont.cpp
@@ -62,27 +62,6 @@ static int getDepth(uint16 _fontType) {
 	return 1 << ((_fontType >> 2) & 3);
 }
 
-MacFont::MacFont() {
-	_fontType = 0;
-	_firstChar = 0;
-	_lastChar = 0;
-	_maxWidth = 0;
-	_kernMax = 0;
-	_nDescent = 0;
-	_fRectWidth = 0;
-	_fRectHeight = 0;
-	_owTLoc = 0;
-	_ascent = 0;
-	_descent = 0;
-	_leading = 0;
-	_rowWords = 0;
-	_bitImage = nullptr;
-}
-
-MacFont::~MacFont() {
-	free(_bitImage);
-}
-
 MacFontFamily::MacFontFamily() {
 	_ffFlags = 0;
 	_ffFamID = 0;
@@ -209,9 +188,13 @@ bool MacFontFamily::load(Common::SeekableReadStream &stream) {
 			debug(10, "  style: %x kernpairs: %d", _ffKernEntries[i]._style, _ffKernEntries[i]._entryLength);
 
 			for (uint j = 0; j < _ffKernEntries[i]._entryLength; j++) {
-				_ffKernEntries[i]._kernPairs[j]._firstChar = stream.readByte();
-				_ffKernEntries[i]._kernPairs[j]._secondChar = stream.readByte();
-				_ffKernEntries[i]._kernPairs[j]._distance = stream.readSint16BE();
+				byte f, s;
+				int16 d;
+				f = _ffKernEntries[i]._kernPairs[j]._firstChar  = stream.readByte();
+				s = _ffKernEntries[i]._kernPairs[j]._secondChar = stream.readByte();
+				d = _ffKernEntries[i]._kernPairs[j]._distance   = stream.readSint16BE();
+
+				_ffKernEntries[i]._kernTable[(f << 8) | s] = d;
 			}
 		}
 	}
@@ -219,7 +202,49 @@ bool MacFontFamily::load(Common::SeekableReadStream &stream) {
 	return true;
  }
 
-bool MacFont::loadFont(Common::SeekableReadStream &stream) {
+ int MacFontFamily::getKerningOffset(uint style, int32 left, uint32 right) const {
+	uint16 idx = ((left & 0xff) << 8) | (right & 0xff);
+
+	for (uint i = 0; i < _ffKernEntries.size(); i++) {
+		if (_ffKernEntries[i]._style == style)
+			if (_ffKernEntries[i]._kernTable.contains(idx))
+				return _ffKernEntries[i]._kernTable[idx];
+	}
+
+	return 0;
+ }
+
+
+ MacFont::MacFont() {
+	_fontType = 0;
+	_firstChar = 0;
+	_lastChar = 0;
+	_maxWidth = 0;
+	_kernMax = 0;
+	_nDescent = 0;
+	_fRectWidth = 0;
+	_fRectHeight = 0;
+	_owTLoc = 0;
+	_ascent = 0;
+	_descent = 0;
+	_leading = 0;
+	_rowWords = 0;
+	_bitImage = nullptr;
+
+	_family = nullptr;
+	_size = 12;
+	_style = 0;
+ }
+
+ MacFont::~MacFont() {
+	free(_bitImage);
+ }
+
+bool MacFont::loadFont(Common::SeekableReadStream &stream, MacFontFamily *family, int size, int style) {
+	_family = family;
+	_size = size;
+	_style = style;
+
 	_fontType    = stream.readUint16BE();	// font type
 	_firstChar   = stream.readUint16BE();	// character code of first glyph
 	_lastChar    = stream.readUint16BE();	// character code of last glyph
@@ -360,4 +385,15 @@ const MacFont::Glyph *MacFont::findGlyph(uint32 c) const {
 	return &_glyphs[c - _firstChar];
 }
 
+int MacFont::getKerningOffset(uint32 left, uint32 right) const {
+	if (_family) {
+		int kerning = _family->getKerningOffset(_style, left, right);
+		kerning *= _size;
+
+		return (int)(kerning / (double)(1 << 12));
+	}
+
+	return 0;
+}
+
 } // End of namespace Graphics
diff --git a/graphics/fonts/macfont.h b/graphics/fonts/macfont.h
index 935fbb2e98..ca1eb72abf 100644
--- a/graphics/fonts/macfont.h
+++ b/graphics/fonts/macfont.h
@@ -24,6 +24,7 @@
 #define GRAPHICS_FONTS_MACFONT_H
 
 #include "common/array.h"
+#include "common/hashmap.h"
 #include "graphics/font.h"
 
 namespace Graphics {
@@ -34,6 +35,15 @@ public:
 	~MacFontFamily();
 
 	bool load(Common::SeekableReadStream &stream);
+	int getKerningOffset(uint style, int32 left, uint32 right) const;
+
+	struct AsscEntry {
+		uint16 _fontSize;
+		uint16 _fontStyle;
+		uint16 _fontID;
+	};
+
+	Common::Array<AsscEntry> *getAssocTable() { return &_ffAssocEntries; }
 
 private:
 	// FOND
@@ -52,12 +62,6 @@ private:
 	uint16 _ffIntl[2];
 	uint16 _ffVersion;
 
-	struct AsscEntry {
-		uint16 _fontSize;
-		uint16 _fontStyle;
-		uint16 _fontID;
-	};
-
 	uint16 _ffNumAssoc;
 	Common::Array<AsscEntry> _ffAssocEntries;
 
@@ -85,6 +89,8 @@ private:
 		uint16 _style;
 		uint16 _entryLength;
 		Common::Array<KernPair> _kernPairs;
+
+		Common::HashMap<uint16, int16> _kernTable;
 	};
 
 	uint16 _ffNumKerns;
@@ -104,10 +110,11 @@ public:
 	virtual int getCharWidth(uint32 chr) const;
 	virtual void drawChar(Surface *dst, uint32 chr, int x, int y, uint32 color) const;
 
-	bool loadFont(Common::SeekableReadStream &stream);
+	bool loadFont(Common::SeekableReadStream &stream, MacFontFamily *family = nullptr, int size = 12, int style = 0);
+
+	virtual int getKerningOffset(uint32 left, uint32 right) const;
 
 private:
-	// FONT/NFNT
 	uint16 _fontType;
 	uint16 _firstChar;
 	uint16 _lastChar;
@@ -141,6 +148,10 @@ private:
 	Common::Array<Glyph> _glyphs;
 	Glyph _defaultChar;
 	const Glyph *findGlyph(uint32 c) const;
+
+	MacFontFamily *_family;
+	int _size;
+	int _style;
 };
 
 } // End of namespace Graphics
-- 
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