Replace pangocairo with freetype

Author: klsruan

modules/ILL/ILL.moon

@@ -1,4 +1,4 @@
-module_version = "1.4.6"
+module_version = "1.4.7"
 
 haveDepCtrl, DependencyControl = pcall require, "l0.DependencyControl"
 

modules/ILL/ILL/Ass/Line.moon

@@ -115,6 +115,8 @@ class Line
 				.internal_leading = textMetrics.internal_leading
 				.external_leading = textMetrics.external_leading
 
+			font\free! if IS_UNIX
+
 			-- text alignment
 			{:an} = .data
 
@@ -486,7 +488,9 @@ class Line
 				-- sets new values
 				lineBlock.data.scale_x = 100
 				lineBlock.data.scale_y = 100
-				textExtents = Font(lineBlock.data)\getTextExtents lineBlock.text_stripped
+				font = Font lineBlock.data
+				textExtents = font\getTextExtents lineBlock.text_stripped
+				font\free! if IS_UNIX
 				lineBlock.width = textExtents.width
 				lineBlock.height = textExtents.height
 				-- converts the text to shape and then converts the shape to Path
@@ -718,7 +722,11 @@ class Line
 			return x * w, y * w
 
 	-- converts the text to shape
-	toShape: (l) -> Font(l.data)\getTextToShape l.text_stripped
+	toShape: (l) ->
+		font = Font l.data
+		shape = font\getTextToShape l.text_stripped
+		font\free! if IS_UNIX
+		return shape
 
 	-- converts the text to Path
 	toPath: (l) -> Path Line.toShape l

modules/ILL/ILL/Font/Font.moon

@@ -21,12 +21,13 @@
 -- Font scale values for increased size & later downscaling to produce floating point coordinates
 export FONT_UPSCALE = 64
 export FONT_DOWNSCALE = 1 / FONT_UPSCALE
+export IS_UNIX = jit.os != "Windows"
 
-if jit.os == "Windows"
+unless IS_UNIX
 	-- if the operating system is windows
 	import WindowsGDI from require "ILL.ILL.Font.Win"
 	return {Font: WindowsGDI}
 
 -- if the operating system is unix
-import PangoCairo from require "ILL.ILL.Font.Unx"
-return {Font: PangoCairo}
+import FreeType from require "ILL.ILL.Font.Unx"
+return {Font: FreeType}