Source

love / src / modules / font / freetype / TrueTypeRasterizer.cpp

/**
 * Copyright (c) 2006-2013 LOVE Development Team
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 **/

// LOVE
#include "TrueTypeRasterizer.h"

#include "common/Exception.h"

namespace love
{
namespace font
{
namespace freetype
{

TrueTypeRasterizer::TrueTypeRasterizer(FT_Library library, Data *data, int size)
	: data(data)
{
	if (FT_New_Memory_Face(library,
						  (const FT_Byte *)data->getData(),	/* first byte in memory */
						  data->getSize(),					/* size in bytes        */
						  0,									/* face_index           */
						  &face))
		throw love::Exception("TrueTypeFont Loading error: FT_New_Face failed (there is probably a problem with your font file)\n");

	FT_Set_Pixel_Sizes(face, size, size);

	// Set global metrics
	FT_Size_Metrics s = face->size->metrics;
	metrics.advance = s.max_advance >> 6;
	metrics.ascent = s.ascender >> 6;
	metrics.descent = s.descender >> 6;
	metrics.height = s.height >> 6;

	data->retain();
}

TrueTypeRasterizer::~TrueTypeRasterizer()
{
	FT_Done_Face(face);
	data->release();
}

int TrueTypeRasterizer::getLineHeight() const
{
	return (int)(getHeight() * 1.25);
}

GlyphData *TrueTypeRasterizer::getGlyphData(unsigned int glyph) const
{
	love::font::GlyphMetrics glyphMetrics;
	FT_Glyph ftglyph;

	// Initialize
	if (FT_Load_Glyph(face, FT_Get_Char_Index(face, glyph), FT_LOAD_DEFAULT))
		throw love::Exception("TrueTypeFont Loading vm->error: FT_Load_Glyph failed\n");

	if (FT_Get_Glyph(face->glyph, &ftglyph))
		throw love::Exception("TrueTypeFont Loading vm->error: FT_Get_Glyph failed\n");

	FT_Glyph_To_Bitmap(&ftglyph, FT_RENDER_MODE_NORMAL, 0, 1);
	FT_BitmapGlyph bitmap_glyph = (FT_BitmapGlyph) ftglyph;
	FT_Bitmap &bitmap = bitmap_glyph->bitmap; //just to make things easier

	// Get metrics
	glyphMetrics.bearingX = face->glyph->metrics.horiBearingX >> 6;
	glyphMetrics.bearingY = face->glyph->metrics.horiBearingY >> 6;
	glyphMetrics.height = bitmap.rows;
	glyphMetrics.width = bitmap.width;
	glyphMetrics.advance = face->glyph->metrics.horiAdvance >> 6;

	GlyphData *glyphData = new GlyphData(glyph, glyphMetrics, GlyphData::FORMAT_LUMINANCE_ALPHA);

	int size = bitmap.rows * bitmap.width;
	unsigned char *dst = (unsigned char *) glyphData->getData();

	// Note that bitmap.buffer contains only luminosity. We copy that single value to
	// our luminosity-alpha format.
	for (int i = 0; i < size; i++)
	{
		dst[2*i] = 255;
		dst[2*i+1] = bitmap.buffer[i];
	}

	// Having copied the data over, we can destroy the glyph
	FT_Done_Glyph(ftglyph);

	// Return data
	return glyphData;
}

int TrueTypeRasterizer::getNumGlyphs() const
{
	return face->num_glyphs;
}

} // freetype
} // font
} // love
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