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The Mask class represents an opacity mask over a rectangular section of an image, linking every pixel to an alpha value ranging from 0 (not selected) to 255 (fully selected). "Partially selected" pixels can be used to simulate anti-aliased curves. This class will be used as the basis for the new non-rectangular selection feature.
106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
/*
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* Copyright (c) 2021, Davipb <daviparca@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Vector.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/Rect.h>
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namespace PixelPaint {
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class Mask {
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public:
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Mask() = default;
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Mask(Mask const&) = default;
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Mask& operator=(Mask const&) = default;
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Mask(Mask&&) = default;
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Mask& operator=(Mask&&) = default;
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[[nodiscard]] static Mask empty(Gfx::IntRect rect) { return { rect, 0x00 }; }
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[[nodiscard]] static Mask full(Gfx::IntRect rect) { return { rect, 0xFF }; }
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[[nodiscard]] bool is_null() const { return m_data.is_empty(); }
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[[nodiscard]] Gfx::IntRect bounding_rect() const { return m_bounding_rect; }
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[[nodiscard]] u8 get(int x, int y) const;
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[[nodiscard]] u8 get(Gfx::IntPoint point) const { return get(point.x(), point.y()); }
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[[nodiscard]] float getf(int x, int y) const { return (float)get(x, y) / 255.0f; }
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[[nodiscard]] float getf(Gfx::IntPoint point) const { return getf(point.x(), point.y()); }
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void set(int x, int y, u8);
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void set(Gfx::IntPoint point, u8 value) { set(point.x(), point.y(), value); }
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void setf(int x, int y, float value) { set(x, y, (u8)clamp(value * 255.0f, 0.0f, 255.0f)); }
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void setf(Gfx::IntPoint point, float value) { setf(point.x(), point.y(), value); }
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void shrink_to_fit();
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[[nodiscard]] Mask with_bounding_rect(Gfx::IntRect) const;
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void invert();
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void add(Mask const& other);
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void subtract(Mask const& other);
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void intersect(Mask const& other);
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template<typename Func>
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void for_each_pixel(Func func) const
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{
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for (int x = m_bounding_rect.left(); x <= m_bounding_rect.right(); x++) {
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for (int y = m_bounding_rect.top(); y <= m_bounding_rect.bottom(); y++) {
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func(x, y);
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}
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}
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}
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private:
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Gfx::IntRect m_bounding_rect {};
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Vector<u8> m_data {};
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Mask(Gfx::IntRect, u8 default_value);
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[[nodiscard]] size_t to_index(int x, int y) const;
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template<typename Func>
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void combine(Mask const& other, Func func)
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{
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auto new_bounding_rect = m_bounding_rect.united(other.m_bounding_rect);
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auto new_me = Mask::empty(new_bounding_rect);
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new_me.for_each_pixel([&](auto x, auto y) {
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// Widen to int then clamp before narrowing back to avoid annoying overflow checks in the combine functions
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auto my_alpha = static_cast<int>(get(x, y));
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auto other_alpha = static_cast<int>(other.get(x, y));
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auto new_alpha = static_cast<u8>(clamp(func(my_alpha, other_alpha), 0, 0xFF));
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new_me.set(x, y, new_alpha);
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});
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*this = move(new_me);
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shrink_to_fit();
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}
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template<typename Func>
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void combinef(Mask const& other, Func func)
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{
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auto new_bounding_rect = m_bounding_rect.united(other.m_bounding_rect);
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auto new_me = Mask::empty(new_bounding_rect);
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new_me.for_each_pixel([&](auto x, auto y) {
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auto my_alpha = getf(x, y);
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auto other_alpha = other.getf(x, y);
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auto new_alpha = func(my_alpha, other_alpha);
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new_me.setf(x, y, new_alpha);
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});
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*this = move(new_me);
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shrink_to_fit();
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}
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};
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}
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