RmlUi/Source/Core/ElementBackgroundBorder.cpp

/*
 * 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) 2019-2023 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 "ElementBackgroundBorder.h"
#include "../../Include/RmlUi/Core/Box.h"
#include "../../Include/RmlUi/Core/ComputedValues.h"
#include "../../Include/RmlUi/Core/Element.h"
#include "../../Include/RmlUi/Core/GeometryUtilities.h"

namespace Rml {

ElementBackgroundBorder::ElementBackgroundBorder() {}

void ElementBackgroundBorder::Render(Element* element)
{
	if (background_dirty || border_dirty)
	{
		for (auto& background : backgrounds)
			background.second.geometry.Release(true);

		GenerateGeometry(element);

		background_dirty = false;
		border_dirty = false;
	}

	if (Geometry* geometry = GetGeometry(BackgroundType::BackgroundBorder))
		geometry->Render(element->GetAbsoluteOffset(BoxArea::Border));
}

void ElementBackgroundBorder::DirtyBackground()
{
	background_dirty = true;
}

void ElementBackgroundBorder::DirtyBorder()
{
	border_dirty = true;
}

Geometry* ElementBackgroundBorder::GetClipGeometry(Element* element, BoxArea clip_area)
{
	BackgroundType type = {};
	switch (clip_area)
	{
	case Rml::BoxArea::Border: type = BackgroundType::ClipBorder; break;
	case Rml::BoxArea::Padding: type = BackgroundType::ClipPadding; break;
	case Rml::BoxArea::Content: type = BackgroundType::ClipContent; break;
	default: RMLUI_ERROR; return nullptr;
	}

	Geometry& geometry = GetOrCreateBackground(type).geometry;
	if (!geometry)
	{
		const Box& box = element->GetBox();
		const Vector4f border_radius = element->GetComputedValues().border_radius();
		GeometryUtilities::GenerateBackground(&geometry, box, {}, border_radius, Colourb(255), clip_area);
	}

	return &geometry;
}

void ElementBackgroundBorder::GenerateGeometry(Element* element)
{
	const ComputedValues& computed = element->GetComputedValues();

	Colourb background_color = computed.background_color();
	Colourb border_colors[4] = {
		computed.border_top_color(),
		computed.border_right_color(),
		computed.border_bottom_color(),
		computed.border_left_color(),
	};
	const Vector4f border_radius = computed.border_radius();

	// Apply opacity
	const float opacity = computed.opacity();
	background_color.alpha = (byte)(opacity * (float)background_color.alpha);

	if (opacity < 1)
	{
		for (int i = 0; i < 4; ++i)
			border_colors[i].alpha = (byte)(opacity * (float)border_colors[i].alpha);
	}

	Geometry& geometry = GetOrCreateBackground(BackgroundType::BackgroundBorder).geometry;
	RMLUI_ASSERT(!geometry);

	for (int i = 0; i < element->GetNumBoxes(); i++)
	{
		Vector2f offset;
		const Box& box = element->GetBox(i, offset);
		GeometryUtilities::GenerateBackgroundBorder(&geometry, box, offset, border_radius, background_color, border_colors);
	}
}

Geometry* ElementBackgroundBorder::GetGeometry(BackgroundType type)
{
	auto it = backgrounds.find(type);
	if (it != backgrounds.end())
		return &it->second.geometry;
	return nullptr;
}

ElementBackgroundBorder::Background& ElementBackgroundBorder::GetOrCreateBackground(BackgroundType type)
{
	auto it = backgrounds.find(type);
	if (it != backgrounds.end())
		return it->second;

	return backgrounds.emplace(type, Background{}).first->second;
}

} // namespace Rml