Initial commit

source/Graphics/Font.cpp

@@ -0,0 +1,127 @@
+
+#include <Spectre/System/File.h>
+#include <Spectre/System/Log.h>
+#include <Spectre/Graphics/Font.h>
+#include <Spectre/Graphics/Image.h>
+#include <Spectre/Graphics/Texture.h>
+#include <Spectre/Math/Math.h>
+#include "Font/FreeTypeDriver.h"
+
+Font::Font() :
+m_size		(22),
+m_driver	(new FreeTypeDriver())
+{
+}
+
+Font::~Font()
+{
+	delete m_driver;
+}
+
+bool Font::loadFromFile(const std::string& filename, unsigned int size)
+{
+	if (!m_driver->loadFromFile(filename)) {
+		return false;
+	}
+
+	if (!m_driver->setCharacterSize(size)) {
+		return false;
+	}
+
+	m_size = size;
+	m_shelf = 0;
+	m_texpos = vec2u(0, 0);
+
+	createTexture();
+
+	return true;
+}
+
+bool Font::loadFromMemory(const void *data, unsigned int size)
+{
+	return false;
+}
+
+Font::Glyph Font::getGlyph(unsigned int code) const
+{
+	if (m_charset.find(code) == m_charset.end()) {
+
+		loadChar(code);
+	}
+	return m_charset[code];
+}
+
+void Font::loadChar(unsigned char code) const
+{
+	Image img;
+	Font::Glyph glyph;
+
+	if (!m_driver) {
+		return;
+	}
+
+	glyph = m_driver->loadGlyph(code, img);
+
+	if (glyph.size > vec2b(0, 0)) {
+
+		Vector2u pos = findTextureRegion(img);
+
+		m_texture.enable();
+		m_texture.update(pos, img);
+
+		glyph.texture = &m_texture;
+		glyph.texture_origin = vec2u(pos.x, pos.y);
+	} else {
+		glyph.texture = NULL;
+	}
+
+	m_charset[code] = glyph;
+}
+
+void Font::createTexture()
+{
+	m_texture.create(128, 32, PixelFormat::PF_Alpha);
+	m_texture.enable();
+	m_texture.setSmooth(true);
+	m_texture.disable();
+}
+
+void Font::resizeTexture() const
+{
+	unsigned int nextSize = math::nextPowerOfTwo(m_texture.getSize().y + 1);
+
+	Image tmpImg = m_texture.copyToImage();
+
+	// recreate texture.
+	m_texture.create(m_texture.getSize().x, nextSize, PixelFormat::PF_Alpha);
+	m_texture.update(vec2u(0, 0), tmpImg);
+}
+
+Vector2u Font::findTextureRegion(const Image& img) const
+{
+	Vector2u pos;
+
+	if (m_texpos.x + img.getWidth() + 1 > m_texture.getSize().x) {
+		m_texpos.y += m_shelf;
+		m_texpos.x = 0;
+		m_shelf = 0;
+	}
+
+	if (img.getHeight() + 1 > m_shelf) {
+		m_shelf = img.getHeight() + 1;
+		if (m_texpos.y + m_shelf > m_texture.getSize().y) {
+			resizeTexture();
+		}
+	}
+	
+	pos = m_texpos;
+
+	m_texpos.x += img.getWidth() + 1;
+
+	return pos;
+}
+
+const Texture* Font::getTexture() const
+{
+	return &m_texture;
+}