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https://github.com/RGBCube/serenity
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LibGfx: Add paint styles and allow gradients to be used as them
Also while here add option to disable pre-multiplied alpha for gradients (this will be handy later).
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3 changed files with 284 additions and 43 deletions
150
Userland/Libraries/LibGfx/PaintStyle.h
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150
Userland/Libraries/LibGfx/PaintStyle.h
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/*
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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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/Function.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/QuickSort.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Vector.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Gradients.h>
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#include <LibGfx/Rect.h>
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namespace Gfx {
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class PaintStyle : public RefCounted<PaintStyle> {
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public:
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virtual ~PaintStyle() = default;
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using SamplerFunction = Function<Color(IntPoint)>;
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using PaintFunction = Function<void(SamplerFunction)>;
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friend Painter;
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friend AntiAliasingPainter;
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private:
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// Simple paint styles can simply override sample_color() if they can easily generate a color from a coordinate.
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virtual Color sample_color(IntPoint) const { return Color(); };
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// Paint styles that have paint time dependent state (e.g. based on the paint size) may find it easier to override paint().
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// If paint() is overridden sample_color() is unused.
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virtual void paint(IntRect physical_bounding_box, PaintFunction paint) const
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{
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(void)physical_bounding_box;
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paint([this](IntPoint point) { return sample_color(point); });
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}
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};
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class SolidColorPaintStyle final : public PaintStyle {
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public:
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static NonnullRefPtr<SolidColorPaintStyle> create(Color color)
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{
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return adopt_ref(*new SolidColorPaintStyle(color));
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}
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virtual Color sample_color(IntPoint) const override { return m_color; }
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private:
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SolidColorPaintStyle(Color color)
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: m_color(color)
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{
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}
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Color m_color;
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};
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class GradientPaintStyle : public PaintStyle {
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public:
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void add_color_stop(float position, Color color, Optional<float> transition_hint = {})
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{
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add_color_stop(ColorStop { color, position, transition_hint });
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}
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void add_color_stop(ColorStop stop, bool sort = true)
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{
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m_color_stops.append(stop);
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if (sort)
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quick_sort(m_color_stops, [](auto& a, auto& b) { return a.position < b.position; });
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}
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void set_repeat_length(float repeat_length)
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{
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m_repeat_length = repeat_length;
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}
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Span<ColorStop const> color_stops() const { return m_color_stops; }
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Optional<float> repeat_length() const { return m_repeat_length; }
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private:
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Vector<ColorStop, 4> m_color_stops;
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Optional<float> m_repeat_length;
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};
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// These paint styles are based on the CSS gradients. They are relative to the painted
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// shape and support premultiplied alpha.
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class LinearGradientPaintStyle final : public GradientPaintStyle {
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public:
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static NonnullRefPtr<LinearGradientPaintStyle> create(float angle = 0.0f)
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{
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return adopt_ref(*new LinearGradientPaintStyle(angle));
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}
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private:
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virtual void paint(IntRect physical_bounding_box, PaintFunction paint) const override;
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LinearGradientPaintStyle(float angle)
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: m_angle(angle)
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{
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}
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float m_angle { 0.0f };
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};
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class ConicGradientPaintStyle final : public GradientPaintStyle {
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public:
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static NonnullRefPtr<ConicGradientPaintStyle> create(IntPoint center, float start_angle = 0.0f)
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{
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return adopt_ref(*new ConicGradientPaintStyle(center, start_angle));
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}
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private:
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virtual void paint(IntRect physical_bounding_box, PaintFunction paint) const override;
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ConicGradientPaintStyle(IntPoint center, float start_angle)
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: m_center(center)
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, m_start_angle(start_angle)
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{
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}
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IntPoint m_center;
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float m_start_angle { 0.0f };
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};
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class RadialGradientPaintStyle final : public GradientPaintStyle {
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public:
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static NonnullRefPtr<RadialGradientPaintStyle> create(IntPoint center, IntSize size)
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{
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return adopt_ref(*new RadialGradientPaintStyle(center, size));
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}
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private:
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virtual void paint(IntRect physical_bounding_box, PaintFunction paint) const override;
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RadialGradientPaintStyle(IntPoint center, IntSize size)
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: m_center(center)
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, m_size(size)
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{
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}
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IntPoint m_center;
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IntSize m_size;
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};
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}
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