basefontrendering.cpp

光滑质点无网格法SPH并行计算程序

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// 
// =============================================================================
//                       Minimalist OpenGL Environment
// =============================================================================
//
// This file is part of Minimalist OpenGL Environment (MinGLE)
//
// Version: 0.2.0
// Author: Balazs Domonkos
// Filename: src/fontrendering/include/BaseFontRendering.cpp
// Creation Date: January 25th 2008
// Revision Date: January 25th 2008
//
//
// The Minimalist OpenGL Environment is free software: you can
// redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// The Minimalist OpenGL Environment 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 General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with Minimalist OpenGL Environment.  If not, see 
// <http://www.gnu.org/licenses/>. See the COPYING file included 
// with this distribution file for license details.
//

/// @file BaseFontRendering.cpp
/// Basic, image atlas based font rendering implementation

// Header that contains the declaration
#include <BaseFontRendering.h>

// MinGLE headers
#include <Exception.h>
#include <System.h>
#include <MathUtils.h>
#include <Atlas.h>

// System headers
#include <math.h>

namespace MinGLE {

// Dynamic library loader function
extern "C"void loadDynLib(void) {
	// Create and register FreeType2 font rendering implementation
	FontRendering::registerImplementation(BaseFontRendering::IMPLEMENTATION_NAME, new BaseFontRendering());
	FontRendering::registerFunctionality(FileFormatFunctionality("xml", FileFormatFunctionality::READ_WRITE), BaseFontRendering::IMPLEMENTATION_NAME);
}

// Dynamic library unloader function
extern "C" void unloadDynLib(void) {
	// Nothing to do
}

// =============================================================================

BaseFont::BaseFont(const std::string& filename, VirtualFileSystem *vfs,
		GLenum format,
		GLenum type) :
RasterFont(DEFAULT_FONT_HEIGHT, DEFAULT_FONT_WIDTH, 0, DEFAULT_FIRST_CHARACTER, DEFAULT_LAST_CHARACTER, format, type, DEFAULT_IMAGE_SCALE_MODE)
{
	// Load image atlas
	mImageAtlas = new ImageAtlas<int>(filename, vfs);

	// TODO find out mFirstCharacter and mLastCharacter

	// Retrieve glyph sizes
	ImageAtlas<int>::CoordSet2D *coordSet = mImageAtlas->getCoordSet(mFirstCharacter);
	mWidth = coordSet->u2 - coordSet->u1;
	mHeight = coordSet->v2 - coordSet->v1;
	
	// TODO convert image to format, type
}

// =============================================================================

const std::string BaseFontRendering::IMPLEMENTATION_NAME = "base";

BaseFontRendering::BaseFontRendering() {
	// Nothing to do
}

BaseFontRendering::~BaseFontRendering() {
	// Nothing to do
}

Font *BaseFontRendering::_createFont(const std::string& filename, VirtualFileSystem *vfs,
		size_t height, size_t width,
		long faceIndex, size_t firstCharacter,
		size_t lastCharacter, GLenum format, GLenum type,
		RasterFont::ImageScaleMode imageScaleMode) {

	return new BaseFont(filename, vfs, format, type);
}

void BaseFontRendering::_saveFont(Font *font, const std::string& filename, VirtualFileSystem *vfs) {
	RasterFont *rasterFont = dynamic_cast<RasterFont *>(font);
	Assert(rasterFont, "BaseFontRendering::_saveFont");

	std::string extension = VirtualFileSystem::getExtension(filename);
	if(extension == "xml")
		rasterFont->getImageAtlas()->saveToFile(filename, vfs);
	else
		Except("BaseFontRendering::_saveFont", "Extension " + extension + " is not supported.");
}

} // namespace MinGLE