ImageData: remove automatic mutex locks.

src/modules/font/BMFontRasterizer.cpp

@@ -343,6 +343,7 @@ GlyphData *BMFontRasterizer::getGlyphDataForIndex(int index) const
 	uint8 *pixels = (uint8 *) g->getData();
 	const uint8 *ipixels = (const uint8 *) imagedata->getData();
 
+	// Always lock the mutex since the user can't know when to do it.
 	love::thread::Lock lock(imagedata->getMutex());
 
 	// Copy the subsection of the texture from the ImageData to the GlyphData.

src/modules/font/ImageRasterizer.cpp

@@ -90,7 +90,7 @@ GlyphData *ImageRasterizer::getGlyphDataForIndex(int index) const
 	if (gm.width == 0)
 		return g;
 
-	// We don't want another thread modifying our ImageData mid-copy.
+	// Always lock the mutex since the user can't know when to do it.
 	love::thread::Lock lock(imageData->getMutex());
 
 	Color32 *gdpixels = (Color32 *) g->getData();
@@ -118,9 +118,6 @@ void ImageRasterizer::load(const uint32 *glyphs, int glyphcount)
 	int imgw = imageData->getWidth();
 	int imgh = imageData->getHeight();
 
-	// We don't want another thread modifying our ImageData mid-parse.
-	love::thread::Lock lock(imageData->getMutex());
-
 	// Set the only metric that matters
 	metrics.height = imgh;