From 645250e1cd8ce9bc1faea599df7a1b05836bfeb8 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Tue, 29 Dec 2020 16:09:43 +0100
Subject: Split UI code into application/plugin UI and UI library.

---
 dggui/font.cc | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 dggui/font.cc

(limited to 'dggui/font.cc')

diff --git a/dggui/font.cc b/dggui/font.cc
new file mode 100644
index 0000000..0500e81
--- /dev/null
+++ b/dggui/font.cc
@@ -0,0 +1,136 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            font.cc
+ *
+ *  Sat Nov 12 11:13:41 CET 2011
+ *  Copyright 2011 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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.
+ *
+ *  DrumGizmo 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.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "font.h"
+
+#include <cassert>
+
+namespace GUI
+{
+
+Font::Font(const std::string& fontfile)
+	: img_font(fontfile)
+{
+	std::size_t px = 0;
+	std::size_t c;
+
+	for(c = 0; c < characters.size() && px < img_font.width(); ++c)
+	{
+		auto& character = characters[c];
+		character.offset = px + 1;
+
+		if(c > 0)
+		{
+			assert(character.offset >= characters[c - 1].offset);
+			characters[c - 1].width = character.offset - characters[c - 1].offset;
+			if(characters[c].offset != characters[c - 1].offset)
+			{
+				--characters[c - 1].width;
+			}
+		}
+
+		++px;
+
+		while(px < img_font.width())
+		{
+			auto& pixel = img_font.getPixel(px, 0);
+
+			// Find next purple pixel in top row:
+			if((pixel.red() == 255) && (pixel.green() == 0) &&
+			   (pixel.blue() == 255) && (pixel.alpha() == 255))
+			{
+				break;
+			}
+
+			++px;
+		}
+
+		characters[c] = character;
+	}
+
+	--c;
+
+	assert(characters[c].offset >= characters[c - 1].offset);
+	characters[c - 1].width = characters[c].offset - characters[c - 1].offset;
+	if(characters[c].offset != characters[c - 1].offset)
+	{
+		--characters[c - 1].width;
+	}
+}
+
+size_t Font::textWidth(const std::string& text) const
+{
+	size_t len = 0;
+
+	for(unsigned char cha : text)
+	{
+		auto& character = characters[cha];
+		len += character.width + spacing + character.post_bias;
+	}
+
+	return len;
+}
+
+size_t Font::textHeight(const std::string& text) const
+{
+	return img_font.height();
+}
+
+void Font::setLetterSpacing(int letterSpacing)
+{
+	spacing = letterSpacing;
+}
+
+int Font::letterSpacing() const
+{
+	return spacing;
+}
+
+PixelBufferAlpha *Font::render(const std::string& text) const
+{
+	PixelBufferAlpha *pb =
+		new PixelBufferAlpha(textWidth(text), textHeight(text));
+
+	int x_offset = 0;
+	for(std::size_t i = 0; i < text.length(); ++i)
+	{
+		unsigned char cha = text[i];
+		auto& character = characters.at(cha);
+		for(size_t x = 0; x < character.width; ++x)
+		{
+			for(size_t y = 0; y < img_font.height(); ++y)
+			{
+				auto& c = img_font.getPixel(x + character.offset, y);
+				pb->setPixel(x + x_offset + character.pre_bias, y, c);
+			}
+		}
+		x_offset += character.width + spacing + character.post_bias;
+	}
+
+	return pb;
+}
+
+} // GUI::
-- 
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