libRocket/Source/Core/BitmapFont/FontFaceLayer.cpp

/*
 * This source file is part of libRocket, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://www.librocket.com
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include "../precompiled.h"
#include "FontFaceLayer.h"
#include "FontFaceHandle.h"

namespace Rocket {
namespace Core {
namespace BitmapFont {

FontFaceLayer::FontFaceLayer() : Rocket::Core::FontFaceLayer()
{
	handle = NULL;
	effect = NULL;
}

FontFaceLayer::~FontFaceLayer()
{
}

// Generates the character and texture data for the layer.
bool FontFaceLayer::Initialise(const Rocket::Core::FontFaceHandle* _handle, FontEffect* _effect, const Rocket::Core::FontFaceLayer* clone, bool deep_clone)
{
	(void)(_effect);

	Rocket::Core::BitmapFont::FontFaceHandle
		* bm_font_face_handle;

	handle = _handle;

	bm_font_face_handle = ( Rocket::Core::BitmapFont::FontFaceHandle * ) handle;

	const FontGlyphList& glyphs = handle->GetGlyphs();

	// Clone the geometry and textures from the clone layer.
	if (clone != NULL)
	{
		// Copy the cloned layer's characters.
		characters = clone->characters;

		// Copy (and reference) the cloned layer's textures.
		for (size_t i = 0; i < clone->textures.size(); ++i)
			textures.push_back(clone->textures[i]);
	}
	else
	{
		// Load texture from file
		Texture texture;
		if (!texture.Load( bm_font_face_handle->GetTextureSource() ))
			return false;

		textures.push_back(texture);

		// Initialise the texture layout for the glyphs.
		characters.resize(glyphs.size(), Character());
		for (FontGlyphList::const_iterator i = glyphs.begin(); i != glyphs.end(); ++i)
		{
			const FontGlyph& glyph = *i;

			if(glyph.dimensions.x <= 0 || glyph.dimensions.y <= 0)
				continue;

			Vector2i glyph_origin( glyph.bitmap_dimensions.x, glyph.bitmap_dimensions.y ); // position in texture
			Vector2i glyph_dimensions = glyph.dimensions; // size of char

			Character character;
			character.origin = Vector2f((float) (glyph.bearing.x), (float) (glyph.bearing.y) - handle->GetBaseline()*3 );
			character.dimensions = Vector2f((float) glyph.dimensions.x, (float) glyph.dimensions.y);

			// Set the character's texture index.
			character.texture_index = 0;

			// Generate the character's texture coordinates.
			character.texcoords[0].x = float(glyph_origin.x) / float(bm_font_face_handle->GetTextureWidth());
			character.texcoords[0].y = float(glyph_origin.y) / float(bm_font_face_handle->GetTextureHeight());
			character.texcoords[1].x = float(glyph_origin.x + character.dimensions.x) / float(bm_font_face_handle->GetTextureWidth());
			character.texcoords[1].y = float(glyph_origin.y + character.dimensions.y) / float(bm_font_face_handle->GetTextureHeight());

			characters[glyph.character] = character;

			// Add the character's dimensions into the texture layout engine.
			texture_layout.AddRectangle(glyph.character, glyph_dimensions);
		}

		// Generate the texture layout; this will position the glyph rectangles efficiently and
		// allocate the texture data ready for writing.
		if (!texture_layout.GenerateLayout(512))
			return false;

	}
	return true;
}

// Generates the texture data for a layer (for the texture database).
bool FontFaceLayer::GenerateTexture(const byte*& texture_data, Vector2i& texture_dimensions, int texture_id)
{
	return true;
}

}
}
}