GUI: Fix font cache.

The bounding boxes of the glyphs use signed coordinates. We stored only
unsigned coordinates, which resulted in incorrect glyph positioning.

Conrecte example: the bounding box of the glyphs for clR6x12-iso-8859-5.bdf
used:

x y  w h
0 -3 6 12

We on the other hand interpreted that as:

x y     w h
0 65533 6 12

when loading the font from our font cache.

svn-id: r51586

1 files changed, 4 insertions, 4 deletions

diff --git a/graphics/font.cpp b/graphics/font.cpp
index 629f2f4b82..74247d4da1 100644
--- a/graphics/font.cpp
+++ b/graphics/font.cpp
@@ -609,8 +609,8 @@ bool NewFont::cacheFontData(const NewFont &font, const Common::String &filename)
 	cacheFile.writeUint16BE(font.desc.height);
 	cacheFile.writeUint16BE(font.desc.fbbw);
 	cacheFile.writeUint16BE(font.desc.fbbh);
-	cacheFile.writeUint16BE(font.desc.fbbx);
-	cacheFile.writeUint16BE(font.desc.fbby);
+	cacheFile.writeSint16BE(font.desc.fbbx);
+	cacheFile.writeSint16BE(font.desc.fbby);
 	cacheFile.writeUint16BE(font.desc.ascent);
 	cacheFile.writeUint16BE(font.desc.firstchar);
 	cacheFile.writeUint16BE(font.desc.size);
@@ -667,8 +667,8 @@ NewFont *NewFont::loadFromCache(Common::SeekableReadStream &stream) {
 	data->height = stream.readUint16BE();
 	data->fbbw = stream.readUint16BE();
 	data->fbbh = stream.readUint16BE();
-	data->fbbx = stream.readUint16BE();
-	data->fbby = stream.readUint16BE();
+	data->fbbx = stream.readSint16BE();
+	data->fbby = stream.readSint16BE();
 	data->ascent = stream.readUint16BE();
 	data->firstchar = stream.readUint16BE();
 	data->size = stream.readUint16BE();