Fixed Arabic text rendering using Harfbuzz. Updated TextRendering sample.

project/include/graphics/Font.h

@@ -57,6 +57,7 @@ namespace lime {
 			void LoadRange (unsigned long start, unsigned long end);
 			value RenderToImage (ImageBuffer *image);
 			void SetSize (size_t size);
+			bool InsertCodepointFromIndex (unsigned long codepoint);
 			
 			#ifdef LIME_FREETYPE
 			FT_Face face;
@@ -67,6 +68,7 @@ namespace lime {
 		private:
 			
 			bool InsertCodepoint (unsigned long codepoint);
+			bool InsertCodepoint (unsigned long codepoint, bool b);
 			
 			std::list<GlyphInfo> glyphList;
 			size_t mSize;

project/src/graphics/Font.cpp

@@ -529,7 +529,15 @@ namespace lime {
 	}
 	
 	
+	bool Font::InsertCodepointFromIndex (unsigned long codepoint) {
+		return InsertCodepoint(codepoint, false);
+	}
+
 	bool Font::InsertCodepoint (unsigned long codepoint) {
+		return InsertCodepoint(codepoint, true);
+	}
+	
+	bool Font::InsertCodepoint (unsigned long codepoint, bool b) {
 		
 		GlyphInfo info;
 		info.codepoint = codepoint;
@@ -543,8 +551,12 @@ namespace lime {
 		// if (codepoint < (*first).codepoint ||
 		// 	(codepoint == (*first).codepoint && mSize != (*first).size)) {
 			
-			info.index = FT_Get_Char_Index (face, codepoint);
 			
+			if (b) {
+				info.index = FT_Get_Char_Index (face, codepoint);
+			} else {
+				info.index = codepoint;	
+			}
 			if (FT_Load_Glyph (face, info.index, FT_LOAD_DEFAULT) != 0) return false;
 			info.height = face->glyph->metrics.height;
 			

project/src/graphics/Text.cpp

@@ -11,7 +11,8 @@ namespace lime {
 
 		if (strlen(script) != 4) return;
 
-		hb_script_t tag = (hb_script_t)HB_TAG (script[0], script[1], script[2], script[3]);
+		//hb_script_t tag = (hb_script_t)HB_TAG (script[0], script[1], script[2], script[3]);
+		hb_script_t tag = hb_script_from_string (script, -1);
 
 		buffer = hb_buffer_create ();
 		hb_buffer_set_direction (buffer, (hb_direction_t)direction);
@@ -48,6 +49,7 @@ namespace lime {
 
 		for (int i = 0; i < glyph_count; i++) {
 
+			font->InsertCodepointFromIndex(glyph_info[i].codepoint);
 			hb_glyph_position_t pos = glyph_pos[i];
 
             value obj = alloc_empty_object ();

samples/TextRendering/Source/Main.hx

@@ -18,10 +18,11 @@ class TextField {
 	private var size:Int;
 	private var text:String;
 	private var image:ImageBuffer;
-
+	private var points:Array<TextFormat.PosInfo>;
 
 	public function new (text:String, size:Int, textFormat:TextFormat, font:Font, context:RenderContext, x:Float=0, y:Float=0) {
 
+		points = textFormat.fromString (font, size, text);
 		font.loadGlyphs (size, text);
 		image = font.createImage ();
 		this.text = text;
@@ -34,8 +35,6 @@ class TextField {
 
 	public function init (context:RenderContext, textFormat:TextFormat, font:Font, x:Float, y:Float) {
 
-		var points = textFormat.fromString (font, size, text);
-
 		switch (context) {
 
 			// case CANVAS (context):
@@ -202,20 +201,20 @@ class Main extends Application {
 
 	public override function init (context:RenderContext):Void {
 
-		textFields.push(new TextField ("صِف خَلقَ خَودِ كَمِثلِ الشَمسِ إِذ بَزَغَت — يَحظى الضَجيعُ بِها نَجلاءَ مِعطارِ", 24,
+		textFields.push(new TextField ("صِف خَلقَ خَودِ كَمِثلِ الشَمسِ إِذ بَزَغَت — يَحظى الضَجيعُ بِها نَجلاءَ مِعطارِ", 16,
 			new TextFormat (RightToLeft, ScriptArabic, "ar"),
-			new Font ("assets/amiri-regular.ttf"),
+			Font.fromFile ("assets/amiri-regular.ttf"),
-			context, window.width - 20, 100));
+			context, window.width, 80));
 
 		textFields.push(new TextField ("The quick brown fox jumps over the lazy dog.", 16,
 			new TextFormat (LeftToRight, ScriptLatin, "en"),
-			new Font ("assets/amiri-regular.ttf"),
+			Font.fromFile ("assets/amiri-regular.ttf"),
 			context, 20, 20));
 
 		textFields.push(new TextField ("懶惰的姜貓", 32,
 			new TextFormat (TopToBottom, ScriptHan, "zh"),
-			new Font ("assets/fireflysung.ttf"),
+			Font.fromFile ("assets/fireflysung.ttf"),
-			context, 50, 150));
+			context, 50, 170));
 
 		switch (context) {