Fix another crash in the font renderer.

3 files changed, 17 insertions, 7 deletions

diff --git a/plugingui/font.cc b/plugingui/font.cc
index a9b102e..a56d392 100644
--- a/plugingui/font.cc
+++ b/plugingui/font.cc
@@ -44,8 +44,12 @@ Font::Font(const std::string& fontfile)
 
 		if(c > 0)
 		{
-			characters[c - 1].width =
-				character.offset - characters[c - 1].offset - 1;
+			assert(character.offset >= characters[c - 1].offset);
+			characters[c - 1].width = character.offset - characters[c - 1].offset;
+			if(characters[c].offset != characters[c - 1].offset)
+			{
+				--characters[c - 1].width;
+			}
 		}
 
 		++px;
@@ -69,7 +73,12 @@ Font::Font(const std::string& fontfile)
 
 	++c;
 
-	characters[c - 1].width = characters[c].offset - characters[c - 1].offset - 1;
+	assert(characters[c].offset >= characters[c - 1].offset);
+	characters[c - 1].width = characters[c].offset - characters[c - 1].offset;
+	if(characters[c].offset != characters[c - 1].offset)
+	{
+		--characters[c - 1].width;
+	}
 }
 
 size_t Font::textWidth(const std::string& text) const
@@ -106,8 +115,9 @@ PixelBufferAlpha *Font::render(const std::string& text) const
 		new PixelBufferAlpha(textWidth(text), textHeight(text));
 
 	int x_offset = 0;
-	for(unsigned char cha : text)
+	for(std::size_t i = 0; i < text.length(); ++i)
 	{
+		unsigned char cha = text[i];
 		auto& character = characters.at(cha);
 		for(size_t x = 0; x < character.width; ++x)
 		{
diff --git a/plugingui/font.h b/plugingui/font.h
index e18f1bd..84e1f63 100644
--- a/plugingui/font.h
+++ b/plugingui/font.h
@@ -51,8 +51,8 @@ private:
 
 	class Character {
 	public:
-		int offset{0};
-		size_t width{0};
+		std::size_t offset{0};
+		std::size_t width{0};
 		int pre_bias{0};
 		int post_bias{0};
 	};
diff --git a/test/paintertest.cc b/test/paintertest.cc
index 69b28ff..f1c2779 100644
--- a/test/paintertest.cc
+++ b/test/paintertest.cc
@@ -117,7 +117,7 @@ public:
 		// Success criterion is simply to not assert in the drawing routines...
 		GUI::Font font;
 		// a string with unicode characters
-		std::string someText = "Hello World - лæ";
+		std::string someText = "Hello World - лæ Библиотека";
 		std::size_t width = font.textWidth(someText);
 		std::size_t height = font.textHeight(someText);