text: /*
   * This source file is part of RmlUi, the HTML/CSS Interface Middleware
   *
   * For the latest information, see http://github.com/mikke89/RmlUi
   *
   * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
   * Copyright (c) 2019 The RmlUi Team, and contributors
   *
   * 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 "FontEffectOutline.h"
  #include "../../Include/RmlUi/Core/PropertyDefinition.h"
  
  namespace Rml {
  
  FontEffectOutline::FontEffectOutline()
  {
  	width = 0;
  	SetLayer(Layer::Back);
  }
  
  FontEffectOutline::~FontEffectOutline()
  {
  }
  
  bool FontEffectOutline::HasUniqueTexture() const
  {
  	return true;
  }
  
  bool FontEffectOutline::Initialise(int _width)
  {
  	if (_width <= 0)
  		return false;
  
  	width = _width;
  
  	filter.Initialise(width, FilterOperation::Dilation);
  	for (int x = -width; x <= width; ++x)
  	{
  		for (int y = -width; y <= width; ++y)
  		{
  			float weight = 1;
  
  			float distance = Math::SquareRoot(float(x * x + y * y));
  			if (distance > width)
  			{
  				weight = (width + 1) - distance;
  				weight = Math::Max(weight, 0.0f);
  			}
  
  			filter[x + width][y + width] = weight;
  		}
  	}
  
  	return true;
  }
  
  bool FontEffectOutline::GetGlyphMetrics(Vector2i& origin, Vector2i& dimensions, const FontGlyph& RMLUI_UNUSED_PARAMETER(glyph)) const
  {
  	RMLUI_UNUSED(glyph);
  
  	if (dimensions.x * dimensions.y > 0)
  	{
  		origin.x -= width;
  		origin.y -= width;
  
  		dimensions.x += 2 * width;
  		dimensions.y += 2 * width;
  
  		return true;
  	}
  
  	return false;
  }
  
  void FontEffectOutline::GenerateGlyphTexture(byte* destination_data, const Vector2i destination_dimensions, int destination_stride, const FontGlyph& glyph) const
  {
  	filter.Run(destination_data, destination_dimensions, destination_stride, ColorFormat::RGBA8, glyph.bitmap_data, glyph.bitmap_dimensions, Vector2i(width));
  }
  
  
  
  FontEffectOutlineInstancer::FontEffectOutlineInstancer() : id_width(PropertyId::Invalid), id_color(PropertyId::Invalid)
  {
  	id_width = RegisterProperty("width", "1px", true).AddParser("length").GetId();
  	id_color = RegisterProperty("color", "white", false).AddParser("color").GetId();
  	RegisterShorthand("font-effect", "width, color", ShorthandType::FallThrough);
  }
  
  FontEffectOutlineInstancer::~FontEffectOutlineInstancer()
  {
  }
  
  SharedPtr<FontEffect> FontEffectOutlineInstancer::InstanceFontEffect(const String& RMLUI_UNUSED_PARAMETER(name), const PropertyDictionary& properties)
  {
  	RMLUI_UNUSED(name);
  
  	float width = properties.GetProperty(id_width)->Get< float >();
  	Colourb color = properties.GetProperty(id_color)->Get< Colourb >();
  
  	auto font_effect = std::make_shared<FontEffectOutline>();
  	if (font_effect->Initialise(Math::RealToInteger(width)))
  	{
  		font_effect->SetColour(color);
  		return font_effect;
  	}
  
  	return nullptr;
  }
  
  } // namespace Rml
  