Add support for our custom SJIS font.

svn-id: r42813

2 files changed, 66 insertions, 0 deletions

diff --git a/graphics/sjis.cpp b/graphics/sjis.cpp
index 6f8979bc6e..0fad3fff94 100644
--- a/graphics/sjis.cpp
+++ b/graphics/sjis.cpp
@@ -27,6 +27,7 @@
 #ifdef GRAPHICS_SJIS_H
 
 #include "common/debug.h"
+#include "common/archive.h"
 
 namespace Graphics {
 
@@ -194,6 +195,52 @@ const uint16 *FontTowns::getCharData(uint16 ch) const {
 	return _fontData + (((chunk_f + chunk) * 32 + (s - base)) + cr) * 16;
 }
 
+// ScummVM SJIS font
+
+bool FontSjisSVM::loadData() {
+	Common::SeekableReadStream *data = SearchMan.createReadStreamForMember("SJIS.FNT");
+	if (!data)
+		return false;
+
+	uint32 version = data->readUint32BE();
+	if (version != 1) {
+		delete data;
+		return false;
+	}
+	uint numChars = data->readUint16BE();
+
+	_fontData = new uint16[numChars * 16];
+	assert(_fontData);
+
+	for (uint i = 0; i < numChars * 16; ++i)
+		_fontData[i] = data->readUint16BE();
+	
+	bool retValue = !data->err();
+	delete data;
+	return retValue;
+}
+
+const uint16 *FontSjisSVM::getCharData(uint16 c) const {
+	const uint8 fB = c & 0xFF;
+	const uint8 sB = c >> 8;
+
+	// We only allow 2 byte SJIS characters.
+	if (fB <= 0x80 || fB >= 0xF0 || (fB >= 0xA0 && fB <= 0xDF) || sB == 0x7F)
+		return 0;
+
+	int base = fB;
+	base -= 0x81;
+	if (base >= 0x5F)
+		base -= 0x40;
+
+	int index = sB;
+	index -= 0x40;
+	if (index >= 0x3F)
+		--index;
+
+	return _fontData + (base * 0xBC + index) * 16;
+}
+
 } // end of namespace Graphics
 
 #endif // defined(GRAPHICS_SJIS_H)
diff --git a/graphics/sjis.h b/graphics/sjis.h
index 954f673f54..661a8834b0 100644
--- a/graphics/sjis.h
+++ b/graphics/sjis.h
@@ -133,6 +133,25 @@ private:
 	const uint16 *getCharData(uint16 c) const;
 };
 
+/**
+ * Our custom SJIS FNT.
+ */
+class FontSjisSVM : public FontSJIS16x16 {
+public:
+	FontSjisSVM() : _fontData(0) {}
+	~FontSjisSVM() { delete[] _fontData; }
+
+	/**
+	 * Load the ROM data from "SJIS.FNT".
+	 */
+	bool loadData();
+
+private:
+	uint16 *_fontData;
+
+	const uint16 *getCharData(uint16 c) const;
+};
+
 // TODO: Consider adding support for PC98 ROM
 
 } // end of namespace Graphics