From 19dc715f75ab52e32f4fa369246877fd6d3b208c Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Wed, 17 Jul 2019 18:39:56 -0400
Subject: text_render(): New function

---
diff --git a/src/text.c b/src/text.c
index d418f57..2ae5a66 100644
--- a/src/text.c
+++ b/src/text.c
@@ -23,6 +23,10 @@
 
 #include <stdlib.h>
 
+#include <png.h>
+
+#include "font.h"
+
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 
 struct text {
@@ -82,6 +86,39 @@ text_get_height(struct text *text)
 	return text->height;
 }
 
+void
+text_render(struct text *text, struct font *font, png_bytepp rows)
+{
+	const char *string;
+	size_t      row;
+	size_t      col;
+	png_color   fg = {255, 255, 255};
+	png_color   bg = {  0,   0,   0};
+
+	string = text->string;
+
+	row = 0;
+	col = 0;
+	while (string && *string) {
+		if (*string == 0x1B && *(string + 1) == '[') {  /* CSI */
+			string += 2;
+			for (; *string >= 0x30 && *string <= 0x3F; ++string);
+			for (; *string >= 0x20 && *string <= 0x2F; ++string);
+			if (*string >= 0x40 && *string <= 0x7E) {
+				++string;
+			}
+		} else if (*string == '\n') {
+			col = 0;
+			++row;
+			++string;
+		} else {
+			font_render(font, &fg, &bg, *string, rows, row, col);
+			++col;
+			++string;
+		}
+	}
+}
+
 struct text *
 text_destroy(struct text **text_p)
 {
diff --git a/src/text.h b/src/text.h
index 0671bb6..e3596c3 100644
--- a/src/text.h
+++ b/src/text.h
@@ -22,6 +22,10 @@
 #ifndef TEXT_H
 #define TEXT_H
 
+#include <png.h>
+
+#include "font.h"
+
 struct text;
 
 struct text *
@@ -33,6 +37,9 @@ text_get_width(struct text *text) __attribute__((pure));
 int
 text_get_height(struct text *text) __attribute__((pure));
 
+void
+text_render(struct text *text, struct font *font, png_bytepp rows);
+
 struct text *
 text_destroy(struct text **text_p);
 
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