/*
 * 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 "DecoratorTiledImage.h"
#include "../../Include/Rocket/Core/Element.h"
#include "../../Include/Rocket/Core/Geometry.h"
#include "../../Include/Rocket/Core/GeometryUtilities.h"

namespace Rocket {
namespace Core {

DecoratorTiledImage::DecoratorTiledImage()
{
	sizing_mode = STRETCH;
}

DecoratorTiledImage::~DecoratorTiledImage()
{
}

// Initialises the tiles for the decorator.
bool DecoratorTiledImage::Initialise(const Tile& _tile, const String& _texture_name, const String& _rcss_path, SizingMode _sizing_mode)
{
	// Load the texture.
	tile = _tile;
	sizing_mode = _sizing_mode;
	tile.texture_index = LoadTexture(_texture_name, _rcss_path);
	if (tile.texture_index < 0)
		return false;

	return true;
}

// Called on a decorator to generate any required per-element data for a newly decorated element.
DecoratorDataHandle DecoratorTiledImage::GenerateElementData(Element* element)
{
	// Calculate the tile's dimensions for this element.
	tile.CalculateDimensions(element, *GetTexture(tile.texture_index));

	Geometry* data = new Geometry(element);
	data->SetTexture(GetTexture());

	// Generate the geometry for the tile.
	if (sizing_mode == STRETCH)
		tile.GenerateGeometry(data->GetVertices(), data->GetIndices(), element, Vector2f(0, 0), element->GetBox().GetSize(Box::PADDING), tile.GetDimensions(element));
	else
	{
		Vector2f surface_dimensions = element->GetBox().GetSize(Box::PADDING);
		Vector2f tile_dimensions = tile.GetDimensions(element);

		if (tile_dimensions.x > 0 &&
			tile_dimensions.y > 0 &&
			surface_dimensions.x > 0 &&
			surface_dimensions.y > 0)
		{
			float scale_x = surface_dimensions.x / tile_dimensions.x;
			float scale_y = surface_dimensions.y / tile_dimensions.y;
			float scale = Math::Min(scale_x, scale_y);
			if (sizing_mode == FILL)
				scale = Math::Max(scale_x, scale_y);

			Vector2f fitted_dimensions = tile_dimensions * scale;
			Vector2f fitted_origin = (surface_dimensions - fitted_dimensions) * 0.5f;

			Tile fitted_tile = tile;
			fitted_tile.repeat_mode = DecoratorTiled::STRETCH;
			fitted_tile.GenerateGeometry(data->GetVertices(), data->GetIndices(), element, fitted_origin, fitted_dimensions, fitted_dimensions);
		}
	}

	return reinterpret_cast<DecoratorDataHandle>(data);
}

// Called to release element data generated by this decorator.
void DecoratorTiledImage::ReleaseElementData(DecoratorDataHandle element_data)
{
	delete reinterpret_cast< Geometry* >(element_data);
}

// Called to render the decorator on an element.
void DecoratorTiledImage::RenderElement(Element* element, DecoratorDataHandle element_data)
{
	Geometry* data = reinterpret_cast< Geometry* >(element_data);
	data->Render(element->GetAbsoluteOffset(Box::PADDING));
}

}
}
