From 5f3bbbc582de4cd48713222f53b40d67354f6a61 Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Tue, 30 May 2023 18:07:18 +0000
Subject: [PATCH] font bb

---
 source/engine/ffi.c      | 15 ++++++++++++++
 source/engine/font.c     | 43 ++++++++++++++++++++++++++++++++++++++--
 source/engine/font.h     |  1 +
 source/engine/render.h   | 20 +++++++++++++++++++
 source/scripts/engine.js | 12 +++++++++--
 5 files changed, 87 insertions(+), 4 deletions(-)

diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 2dbbe73..545a33a 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -293,6 +293,16 @@ JSValue nk_rect2js(struct nk_rect rect) {
   return obj;
 }
 
+JSValue bb2js(struct boundingbox bb)
+{
+  JSValue obj = JS_NewObject(js);
+  JS_SetPropertyStr(js,obj,"t", JS_NewFloat64(js,bb.t));
+  JS_SetPropertyStr(js,obj,"b", JS_NewFloat64(js,bb.b));
+  JS_SetPropertyStr(js,obj,"r", JS_NewFloat64(js,bb.r));
+  JS_SetPropertyStr(js,obj,"l", JS_NewFloat64(js,bb.l));
+  return obj;
+}
+
 JSValue duk_nuke(JSContext *js, JSValueConst this, int argc, JSValueConst *argv) {
   int cmd = js2int(argv[0]);
   float editnum;
@@ -1027,6 +1037,11 @@ JSValue duk_cmd(JSContext *js, JSValueConst this, int argc, JSValueConst *argv)
       str = JS_ToCString(js, argv[1]);
       ret = JS_NewInt64(js, script_runfile(str));
       break;
+
+    case 118:
+      str = JS_ToCString(js,argv[1]);
+      return bb2js(text_bb(str, js2number(argv[2]), js2number(argv[3])));
+      break;
     
   }
 
diff --git a/source/engine/font.c b/source/engine/font.c
index 88205d4..f93f1b7 100644
--- a/source/engine/font.c
+++ b/source/engine/font.c
@@ -307,6 +307,47 @@ void text_settype(struct sFont *mfont) {
   font = mfont;
 }
 
+struct boundingbox text_bb(const char *text, float scale, float lw)
+{
+  HMM_Vec2 cursor = {0,0};
+  unsigned char *c = text;
+  unsigned char *wordstart;
+
+  while (*c != '\0') {
+    if (isblank(*c)) {
+      cursor.X += font->Characters[*c].Advance * scale;
+      c++;
+    } else if (isspace(*c)) {
+      cursor.Y -= scale * font->height;
+      cursor.X = 0;
+      c++;
+    } else {
+      wordstart = c;
+      int wordwidth = 0;
+
+      while (!isspace(*c) && *c != '\0') {
+        wordwidth += font->Characters[*c].Advance * scale;
+	c++;
+      }
+
+      if (lw > 0 && (cursor.X + wordwidth) >= lw) {
+        cursor.X = 0;
+	cursor.Y -= scale * font->height;
+      }
+
+      while (wordstart < c) {
+        cursor.X += font->Characters[*wordstart].Advance * scale;
+	wordstart++;
+      }
+    }
+  }
+
+  float height = cursor.Y + (font->height*scale);
+  float width = lw > 0 ? lw : cursor.X;
+
+  return cwh2bb((HMM_Vec2){0,0}, (HMM_Vec2){width,height});
+}
+
 int renderText(const char *text, HMM_Vec2 pos, float scale, struct rgba color, float lw, int caret) {
   int len = strlen(text);
   drawcaret = caret;
@@ -328,9 +369,7 @@ int renderText(const char *text, HMM_Vec2 pos, float scale, struct rgba color, f
       cursor.Y -= scale * font->height;
       cursor.X = pos.X;
       line++;
-
     } else {
-
       wordstart = line;
       int wordWidth = 0;
 
diff --git a/source/engine/font.h b/source/engine/font.h
index 074017f..7b301a4 100644
--- a/source/engine/font.h
+++ b/source/engine/font.h
@@ -28,6 +28,7 @@ void font_init(struct shader *s);
 struct sFont *MakeFont(const char *fontfile, int height);
 void sdrawCharacter(struct Character c, HMM_Vec2 cursor, float scale, struct rgba color);
 void text_settype(struct sFont *font);
+struct boundingbox text_bb(const char *text, float scale, float lw);
 int renderText(const char *text, HMM_Vec2 pos, float scale, struct rgba color, float lw, int caret);
 
 // void text_frame();
diff --git a/source/engine/render.h b/source/engine/render.h
index 1402fd8..977d863 100644
--- a/source/engine/render.h
+++ b/source/engine/render.h
@@ -6,6 +6,8 @@
 
 #include "sokol/sokol_gfx.h"
 
+#include "HandmadeMath.h"
+
 struct uv_n {
   unsigned short u;
   unsigned short v;
@@ -23,6 +25,24 @@ struct rgba {
   unsigned char a;
 };
 
+struct boundingbox {
+  float t;
+  float b;
+  float r;
+  float l;
+};
+
+static struct boundingbox cwh2bb(HMM_Vec2 c, HMM_Vec2 wh) {
+  struct boundingbox bb = {
+    .t = c.Y + wh.Y/2,
+    .b = c.Y - wh.Y/2,
+    .r = c.X + wh.X/2,
+    .l = c.X - wh.X/2
+  };
+
+  return bb;
+}
+
 static float *rgba2floats(float *r, struct rgba c)
 {
   r[0] = c.r / 255.0;
diff --git a/source/scripts/engine.js b/source/scripts/engine.js
index 27a76d4..8802053 100644
--- a/source/scripts/engine.js
+++ b/source/scripts/engine.js
@@ -138,8 +138,12 @@ var GUI = {
   text(str, pos, size, color, wrap) {
     size = size ? size : 1;
     color = color ? color : [255,255,255,255];
-    wrap = wrap ? wrap : 500;
-    var h = ui_text(str, pos, size, color, wrap);
+    wrap = wrap ? wrap : -1;
+
+    var bb = cmd(118, str, size, wrap);
+    var opos = [bb.r, bb.t];
+        
+    var h = ui_text(str, pos.sub(opos), size, color, wrap);
 
     return [wrap,h];
   },
@@ -147,6 +151,10 @@ var GUI = {
   text_cursor(str, pos, size, cursor) {
     cursor_text(str,pos,size,[255,255,255],cursor);
   },
+
+  column(items) {
+    items.forEach(x => x());
+  },
 };
 
 function listbox(pos, item) {