Test implementation of birdfont rendering tools

Changed files (3)

• added libbirdfont/Renderer/FontCache.vala
• added libbirdfont/Renderer/TextArea.vala
• added libbirdfont/Renderer/TextTab.vala

Diff

diff --git a/libbirdfont/Renderer/FontCache.vala b/libbirdfont/Renderer/FontCache.valanew file mode 100644index 0000000..cfb0fdc--- /dev/null+++ b/libbirdfont/Renderer/FontCache.vala@@ -0,0 +1,64 @@+/*+    Copyright (C) 2014 Johan Mattsson++    This library is free software; you can redistribute it and/or modify +    it under the terms of the GNU Lesser General Public License as +    published by the Free Software Foundation; either version 3 of the +    License, or (at your option) any later version.++    This library is distributed in the hope that it will be useful, but +    WITHOUT ANY WARRANTY; without even the implied warranty of +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +    Lesser General Public License for more details.+*/++namespace BirdFont {++/** Thread specific font cache. */	+public class FontCache {+	Font? font;+	string file_name;+	+	static FontCache? default_cache = null;+	+	public FontCache () {+		font = null;+		file_name = "";+	}+	+	public Font? get_font (string file_name) {+		Font f;+		bool ok;+		+		if (file_name == "") {+			stderr.printf ("No file name provided.");+			return null;+		}+		+		if (this.file_name != file_name) {+			f = new Font ();+			this.file_name = file_name;+			+			f.set_file (file_name, false);+			ok = f.load ();+			if (!ok) {+				stderr.printf ("Can't load %s", file_name);+				return null;+			}+			+			font = f;+		}+		+		return font;+	}+	+	public static FontCache get_default_cache () {+		if (default_cache == null) {+			default_cache = new FontCache ();+		}+		+		return (!) default_cache;+	}+}++}diff --git a/libbirdfont/Renderer/TextArea.vala b/libbirdfont/Renderer/TextArea.valanew file mode 100644index 0000000..90a24f2--- /dev/null+++ b/libbirdfont/Renderer/TextArea.vala@@ -0,0 +1,155 @@+/*+    Copyright (C) 2014 Johan Mattsson++    This library is free software; you can redistribute it and/or modify +    it under the terms of the GNU Lesser General Public License as +    published by the Free Software Foundation; either version 3 of the +    License, or (at your option) any later version.++    This library is distributed in the hope that it will be useful, but +    WITHOUT ANY WARRANTY; without even the implied warranty of +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +    Lesser General Public License for more details.+*/++using Cairo;++namespace BirdFont {++/** Test implementation of a birdfont rendering engine. */+public class TextArea {+	+	FontCache font_cache;+	Font font;+	string text;+	GlyphSequence glyph_sequence;+	+	public TextArea () {+		font = new Font ();+		text = "";+		glyph_sequence = new GlyphSequence ();+		font_cache = FontCache.get_default_cache ();+	}++	public void set_font_cache (FontCache font_cache) {+		this.font_cache = font_cache;+	}+	+	public void set_text (string text) {	+		int index;+		unichar c;+		string name;+		Glyph? g;+		+		this.text = text;+		glyph_sequence = new GlyphSequence ();+		+		index = 0;+		while (text.get_next_char (ref index, out c)) {+			name = font.get_name_for_character (c);+			g = font.get_glyph_by_name (name);+			glyph_sequence.glyph.add (g);+		}		+	}+	+	public bool load_font (string file) {+		Font? f = font_cache.get_font (file);+		+		if (f != null) {+			font = (!) f;+		}+		+		return f != null;+	}+	+	public void draw (Context cr, int x, int y, int width, int height) {+		WidgetAllocation wa = new WidgetAllocation.for_area (x, y, width, height);+		draw_glyphs (wa, cr);+	}++	public void draw_glyphs (WidgetAllocation allocation, Context cr) {+		Glyph glyph;+		double x, y, w, kern;+		int i, wi;+		Glyph? prev;+		GlyphSequence word_with_ligatures;+		GlyphRange? gr_left, gr_right;+		double row_height;+		GlyphSequence word;+		+		i = 0;+		+		cr.save ();+		cr.scale (KerningTools.font_size, KerningTools.font_size);+		+		glyph = MainWindow.get_current_glyph ();+		+		row_height = get_row_height ();+	+		y = get_row_height () + font.base_line + 20;+		x = 20;+		w = 0;+		prev = null;+		kern = 0;+		+		word = glyph_sequence;+		wi = 0;+		word_with_ligatures = word.process_ligatures ();+		gr_left = null;+		gr_right = null;+		foreach (Glyph? g in word_with_ligatures.glyph) {+			if (g == null) {+				continue;+			}+			+			if (prev == null || wi == 0) {+				kern = 0;+			} else {+				return_if_fail (wi < word_with_ligatures.ranges.size);+				return_if_fail (wi - 1 >= 0);+				+				gr_left = word_with_ligatures.ranges.get (wi - 1);+				gr_right = word_with_ligatures.ranges.get (wi);++				kern = KerningDisplay.get_kerning_for_pair (((!)prev).get_name (), ((!)g).get_name (), gr_left, gr_right);+			}+					+			// draw glyph+			if (g == null) {+				w = 50;+			} else {+				glyph = (!) g;++				cr.save ();+				glyph.add_help_lines ();+				cr.translate (kern + x - glyph.get_lsb () - Glyph.xc (), glyph.get_baseline () + y  - Glyph.yc ());+				glyph.draw_paths (cr);+				cr.restore ();+				+				w = glyph.get_width ();+			}++			x += w + kern;++			prev = g;+			+			wi++;+			i++;+		}+					+		y += row_height + 20;+		x = 20;+			+		cr.restore ();		+	}	++	double get_row_height () {+		return font.top_limit - font.bottom_limit;+	}+	+	internal static void test () {+		MainWindow.get_tab_bar ().add_tab (new TextTab ());+	}+}++}diff --git a/libbirdfont/Renderer/TextTab.vala b/libbirdfont/Renderer/TextTab.valanew file mode 100644index 0000000..d931435--- /dev/null+++ b/libbirdfont/Renderer/TextTab.vala@@ -0,0 +1,41 @@+/*+    Copyright (C) 2014 Johan Mattsson++    This library is free software; you can redistribute it and/or modify +    it under the terms of the GNU Lesser General Public License as +    published by the Free Software Foundation; either version 3 of the +    License, or (at your option) any later version.++    This library is distributed in the hope that it will be useful, but +    WITHOUT ANY WARRANTY; without even the implied warranty of +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +    Lesser General Public License for more details.+*/++using Cairo;++namespace BirdFont {++/** Testing class for an experimental implementation of a birdfont rendering engine. */+public class TextTab : FontDisplay {++	TextArea text_area;+	TextArea text_area2;++	public TextTab () {	+		text_area = new TextArea ();+		text_area.load_font ("testfont.bf");+		text_area.set_text ("Test");++		text_area2 = new TextArea ();+		text_area2.load_font ("testfont.bf");+		text_area2.set_text ("Birdfont");+	}++	public override void draw (WidgetAllocation allocation, Context cr) {+		text_area.draw (cr, 100, 100, 200, 200);+		text_area2.draw (cr, 100, 200, 200, 200);+	}	+}++}