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/*
* Copyright (c) 2021, Davipb <daviparca@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Vector.h>
#include <LibGfx/Point.h>
#include <LibGfx/Rect.h>
namespace PixelPaint {
class Mask {
public:
Mask() = default;
Mask(Mask const&) = default;
Mask& operator=(Mask const&) = default;
Mask(Mask&&) = default;
Mask& operator=(Mask&&) = default;
[[nodiscard]] static Mask empty(Gfx::IntRect rect) { return { rect, 0x00 }; }
[[nodiscard]] static Mask full(Gfx::IntRect rect) { return { rect, 0xFF }; }
[[nodiscard]] bool is_null() const { return m_data.is_empty(); }
[[nodiscard]] Gfx::IntRect bounding_rect() const { return m_bounding_rect; }
[[nodiscard]] u8 get(int x, int y) const;
[[nodiscard]] u8 get(Gfx::IntPoint point) const { return get(point.x(), point.y()); }
[[nodiscard]] float getf(int x, int y) const { return (float)get(x, y) / 255.0f; }
[[nodiscard]] float getf(Gfx::IntPoint point) const { return getf(point.x(), point.y()); }
void set(int x, int y, u8);
void set(Gfx::IntPoint point, u8 value) { set(point.x(), point.y(), value); }
void setf(int x, int y, float value) { set(x, y, (u8)clamp(value * 255.0f, 0.0f, 255.0f)); }
void setf(Gfx::IntPoint point, float value) { setf(point.x(), point.y(), value); }
void shrink_to_fit();
[[nodiscard]] Mask with_bounding_rect(Gfx::IntRect) const;
void invert();
void add(Mask const& other);
void subtract(Mask const& other);
void intersect(Mask const& other);
template<typename Func>
void for_each_pixel(Func func) const
{
for (int x = m_bounding_rect.left(); x <= m_bounding_rect.right(); x++) {
for (int y = m_bounding_rect.top(); y <= m_bounding_rect.bottom(); y++) {
func(x, y);
}
}
}
private:
Gfx::IntRect m_bounding_rect {};
Vector<u8> m_data {};
Mask(Gfx::IntRect, u8 default_value);
[[nodiscard]] size_t to_index(int x, int y) const;
template<typename Func>
void combine(Mask const& other, Func func)
{
auto new_bounding_rect = m_bounding_rect.united(other.m_bounding_rect);
auto new_me = Mask::empty(new_bounding_rect);
new_me.for_each_pixel([&](auto x, auto y) {
// Widen to int then clamp before narrowing back to avoid annoying overflow checks in the combine functions
auto my_alpha = static_cast<int>(get(x, y));
auto other_alpha = static_cast<int>(other.get(x, y));
auto new_alpha = static_cast<u8>(clamp(func(my_alpha, other_alpha), 0, 0xFF));
new_me.set(x, y, new_alpha);
});
*this = move(new_me);
shrink_to_fit();
}
template<typename Func>
void combinef(Mask const& other, Func func)
{
auto new_bounding_rect = m_bounding_rect.united(other.m_bounding_rect);
auto new_me = Mask::empty(new_bounding_rect);
new_me.for_each_pixel([&](auto x, auto y) {
auto my_alpha = getf(x, y);
auto other_alpha = other.getf(x, y);
auto new_alpha = func(my_alpha, other_alpha);
new_me.setf(x, y, new_alpha);
});
*this = move(new_me);
shrink_to_fit();
}
};
}
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