use libgrapheme to interpret utf8 encoded strings

lib/libgrapheme.c3l/libgrapheme.c3i

@@ -1,6 +1,6 @@
 module grapheme;
 
-const uint GRAPHEME_INVALID_CODEPOINT UINT32_C = 0xFFFD;
+const uint GRAPHEME_INVALID_CODEPOINT = 0xFFFD;
 
 enum BidirectionalDirection {
 	GRAPHEME_BIDIRECTIONAL_DIRECTION_NEUTRAL,

project.json

@@ -6,7 +6,7 @@
   // Directories where C3 library files may be found.
   "dependency-search-paths": [ "lib" ],
   // Libraries to use for all targets.
-  "dependencies": [ "raylib", "schrift" ],
+  "dependencies": [ "raylib", "schrift", "grapheme" ],
   "features": [
     // See rcore.c3
     //"SUPPORT_INTERNAL_MEMORY_MANAGEMENT",
@@ -17,13 +17,12 @@
     //"SUPPORT_TEXT_CODEPOINTS_MANAGEMENT",
     //"SUPPORT_TEXT_C_STRING_MANAGEMENT",
     //"SUPPORT_RANDOM_GENERATION",
-  
-    "SUPPORT_RAYGUI",
+    //"SUPPORT_RAYGUI",
     //"RAYGUI_NO_ICONS",
     //"RAYGUI_CUSTOM_ICONS",
   ],
   // Authors, optionally with email.
-  "authors": [ "John Doe <john.doe@example.com>" ],
+  "authors": [ "John Doe <ale@shitposting.expert>" ],
   // Version using semantic versioning.
   "version": "0.1.0",
   // Sources compiled for all targets.

src/main.c3

@@ -27,7 +27,7 @@ fn int main(String[] args)
 {
 	ugui::Ctx ui;
 	ui.init()!!;
-	ui.font.load("/usr/share/fonts/TTF/Hack-Regular.ttf", 16, scale: 1.5)!!;
+	ui.font.load("/usr/share/fonts/NerdFonts/ttf/HackNerdFont-Regular.ttf", 16, scale: 1.5)!!;
 
 	short width = 800;
 	short height = 450;
@@ -94,7 +94,7 @@ fn int main(String[] args)
 				io::printfn("slider: %f", e.slider.value);
 			}
 
-			ui.text_unbounded("text1", "Ciao Mamma\nSono a Casa")!!;
+			ui.text_unbounded("text1", "Ciao Mamma\nAbilità ⚡")!!;
 		|};
 		ui.div_end()!!;
 

src/ugui_cmd.c3

@@ -1,5 +1,7 @@
 module ugui;
 
+import std::ascii;
+
 // FIXME: is this really the best solution?
 // "rect" is the bounding box of the element, which includes the border and the padding (so not just the content)
 fn void! Ctx.push_rect(&ctx, Rect rect, Color color, bool do_border = false, bool do_padding = false, bool do_radius = false)
@@ -48,3 +50,50 @@ fn void! Ctx.push_sprite(&ctx, Rect bounds, Rect texture)
 	};
 	ctx.cmd_queue.enqueue(&cmd)!;
 }
+
+fn void! Ctx.push_string(&ctx, Rect bounds, String text)
+{
+	if (text.len == 0) {
+		return;
+	}
+	
+	short baseline = (short)ctx.font.ascender;
+	short line_height = (short)ctx.font.ascender - (short)ctx.font.descender;
+	short line_gap = (short)ctx.font.linegap;
+	Point orig = {
+		.x = bounds.x,
+		.y = bounds.y,
+	};
+
+	short line_len;
+	Codepoint cp;
+	usz off, x;
+	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
+		off += x;
+		Glyph* gp;
+		if (!ascii::is_cntrl((char)cp)) {
+			gp = ctx.font.get_glyph(cp)!;
+			Rect gb = {
+    			.x = orig.x + line_len + gp.ox,
+    			.y = orig.y + gp.oy + baseline,
+    			.w = gp.w,
+    			.h = gp.h,
+			};
+			Rect gt = {
+    			.x = gp.u,
+    			.y = gp.v,
+    			.w = gp.w,
+    			.h = gp.h,
+			};
+			if (rect_collision(gb, bounds)) {
+				ctx.push_sprite(gb, gt)!;
+			}
+			line_len += gp.adv;
+		} else if (cp == '\n'){
+			orig.y += line_height + line_gap;
+			line_len = 0;
+		} else {
+			continue;
+		}
+	}
+}

src/ugui_data.c3

@@ -1,6 +1,5 @@
 module ugui;
 
-import std::io;
 import std::core::string;
 
 import vtree;

src/ugui_text.c3

@@ -1,6 +1,22 @@
 module ugui;
 
 import std::io;
+import std::ascii;
+import grapheme;
+
+<*
+@require off != null
+*>
+fn Codepoint str_to_codepoint(char[] str, usz* off)
+{
+	Codepoint cp;
+	isz b = grapheme::decode_utf8(str, str.len, &cp);
+	if (b == 0 || b > str.len) {
+		return 0;
+	}
+	*off = b;
+	return cp;
+}
 
 fn Rect! Ctx.get_text_bounds(&ctx, String text, bool* update_atlas)
 {
@@ -12,16 +28,20 @@ fn Rect! Ctx.get_text_bounds(&ctx, String text, bool* update_atlas)
 
 	// TODO: account for unicode codepoints
 	short line_len;
-	foreach (c: text) {
-		Codepoint cp = (Codepoint)c;
+	Codepoint cp;
+	usz off, x;
+	while ((cp = str_to_codepoint(text[off..], &x)) != 0) {
+		off += x;
 		bool n;
-		if (cp != '\n') {
+		if (!ascii::is_cntrl((char)cp)) {
 			gp = ctx.font.get_glyph(cp, &n)!;
 			line_len += gp.adv;
 			if (n) { *update_atlas = true; }
-		} else {
+		} else if (cp == '\n'){
 			text_bounds.h += line_height + line_gap;
 			line_len = 0;
+		} else {
+			continue;
 		}
 		if (line_len > text_bounds.w) {
 			text_bounds.w = line_len;
@@ -79,33 +99,5 @@ fn void! Ctx.text_unbounded(&ctx, String label, String text)
 	};
 	ctx.cmd_queue.enqueue(&bounds)!;
 
-	Point orig = {
-		.x = c_elem.bounds.x,
-		.y = c_elem.bounds.y,
-	};
-	short line_len;
-	foreach (c: text) {
-		Glyph* gp;
-		Codepoint cp = (Codepoint)c;
-		if (cp != '\n') {
-			gp = ctx.font.get_glyph(cp)!;
-			Rect gb = {
-    			.x = orig.x + line_len + gp.ox,
-    			.y = orig.y + gp.oy + baseline,
-    			.w = gp.w,
-    			.h = gp.h,
-			};
-			Rect gt = {
-    			.x = gp.u,
-    			.y = gp.v,
-    			.w = gp.w,
-    			.h = gp.h,
-			};
-			ctx.push_sprite(gb, gt)!;
-			line_len += gp.adv;
-		} else {
-			orig.y += line_height + line_gap;
-			line_len = 0;
-		}
-	}
+	ctx.push_string(c_elem.bounds, text)!;
 }