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/*
* 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 "FontEffectOutline.h"
namespace Rocket {
namespace Core {
FontEffectOutline::FontEffectOutline()
{
width = 0;
// Default the z-index of an outline effect to be behind the main layer.
SetZIndex(-1);
}
FontEffectOutline::~FontEffectOutline()
{
}
// Returns true.
bool FontEffectOutline::HasUniqueTexture() const
{
return true;
}
// Initialise the outline effect.
bool FontEffectOutline::Initialise(int _width)
{
if (_width <= 0)
return false;
width = _width;
filter.Initialise(width, ConvolutionFilter::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;
}
// Resizes and repositions the glyph to fit the outline.
bool FontEffectOutline::GetGlyphMetrics(Vector2i& origin, Vector2i& dimensions, const FontGlyph& ROCKET_UNUSED_PARAMETER(glyph)) const
{
ROCKET_UNUSED(glyph);
if (dimensions.x * dimensions.y > 0)
{
origin.x -= width;
origin.y -= width;
dimensions.x += width;
dimensions.y += width;
return true;
}
return false;
}
// Expands the original glyph texture for the outline.
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, glyph.bitmap_data, glyph.bitmap_dimensions, Vector2i(width, width));
}
}
}
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