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https://github.com/RGBCube/serenity
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1c807410cd
The algorithm is quite simple: You grab a 2x2 area of pixels around the point you want from the source bitmap, and then linearly interpolate between them based on how far they are from that point. This works well when scaling up images, and moderately well when scaling down - small details may get skipped over. The way GPUs solve this is with mipmaps, which is not something I want to get into right now. (And increases the memory usage per bitmap by 50%.) I have not focused on performance, but this does reuse much of the existing fixed-point calculation, and uses constexpr so that the performance for nearest-neighbor should be the same as it was previously.
185 lines
10 KiB
C++
185 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/Forward.h>
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#include <AK/NonnullRefPtr.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/Point.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/Size.h>
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#include <LibGfx/TextAlignment.h>
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#include <LibGfx/TextDirection.h>
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#include <LibGfx/TextElision.h>
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#include <LibGfx/TextWrapping.h>
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namespace Gfx {
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class Painter {
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public:
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explicit Painter(Gfx::Bitmap&);
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~Painter();
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enum class LineStyle {
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Solid,
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Dotted,
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Dashed,
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};
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enum class ScalingMode {
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NearestNeighbor,
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BilinearBlend,
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};
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void clear_rect(IntRect const&, Color);
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void fill_rect(IntRect const&, Color);
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void fill_rect_with_dither_pattern(IntRect const&, Color, Color);
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void fill_rect_with_checkerboard(IntRect const&, IntSize const&, Color color_dark, Color color_light);
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void fill_rect_with_gradient(Orientation, IntRect const&, Color gradient_start, Color gradient_end);
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void fill_rect_with_gradient(IntRect const&, Color gradient_start, Color gradient_end);
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void fill_rect_with_rounded_corners(IntRect const&, Color, int radius);
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void fill_rect_with_rounded_corners(IntRect const&, Color, int top_left_radius, int top_right_radius, int bottom_right_radius, int bottom_left_radius);
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void fill_ellipse(IntRect const&, Color);
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void draw_rect(IntRect const&, Color, bool rough = false);
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void draw_rect_with_thickness(IntRect const&, Color, int thickness);
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void draw_focus_rect(IntRect const&, Color);
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void draw_bitmap(IntPoint const&, CharacterBitmap const&, Color = Color());
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void draw_bitmap(IntPoint const&, GlyphBitmap const&, Color = Color());
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void draw_scaled_bitmap(IntRect const& dst_rect, Gfx::Bitmap const&, IntRect const& src_rect, float opacity = 1.0f, ScalingMode = ScalingMode::NearestNeighbor);
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void draw_scaled_bitmap(IntRect const& dst_rect, Gfx::Bitmap const&, FloatRect const& src_rect, float opacity = 1.0f, ScalingMode = ScalingMode::NearestNeighbor);
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void draw_triangle(IntPoint const&, IntPoint const&, IntPoint const&, Color);
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void draw_ellipse_intersecting(IntRect const&, Color, int thickness = 1);
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void set_pixel(IntPoint const&, Color);
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void set_pixel(int x, int y, Color color) { set_pixel({ x, y }, color); }
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void draw_line(IntPoint const&, IntPoint const&, Color, int thickness = 1, LineStyle style = LineStyle::Solid, Color alternate_color = Color::Transparent);
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void draw_quadratic_bezier_curve(IntPoint const& control_point, IntPoint const&, IntPoint const&, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
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void draw_cubic_bezier_curve(IntPoint const& control_point_0, IntPoint const& control_point_1, IntPoint const&, IntPoint const&, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
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void draw_elliptical_arc(IntPoint const& p1, IntPoint const& p2, IntPoint const& center, FloatPoint const& radii, float x_axis_rotation, float theta_1, float theta_delta, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
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void blit(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect, float opacity = 1.0f, bool apply_alpha = true);
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void blit_dimmed(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect);
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void blit_brightened(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect);
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void blit_filtered(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect, Function<Color(Color)>);
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void draw_tiled_bitmap(IntRect const& dst_rect, Gfx::Bitmap const&);
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void blit_offset(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect, IntPoint const&);
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void blit_disabled(IntPoint const&, Gfx::Bitmap const&, IntRect const&, Palette const&);
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void blit_tiled(IntRect const&, Gfx::Bitmap const&, IntRect const& src_rect);
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void draw_text(IntRect const&, StringView const&, Font const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(IntRect const&, StringView const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(IntRect const&, Utf32View const&, Font const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(IntRect const&, Utf32View const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, StringView const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, Utf8View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, Utf32View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
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void draw_ui_text(Gfx::IntRect const&, StringView const&, Gfx::Font const&, TextAlignment, Gfx::Color);
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void draw_glyph(IntPoint const&, u32, Color);
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void draw_glyph(IntPoint const&, u32, Font const&, Color);
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void draw_emoji(IntPoint const&, Gfx::Bitmap const&, Font const&);
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void draw_glyph_or_emoji(IntPoint const&, u32 code_point, Font const&, Color);
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void draw_circle_arc_intersecting(IntRect const&, IntPoint const&, int radius, Color, int thickness);
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enum class CornerOrientation {
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TopLeft,
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TopRight,
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BottomRight,
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BottomLeft
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};
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void fill_rounded_corner(IntRect const&, int radius, Color, CornerOrientation);
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static void for_each_line_segment_on_bezier_curve(FloatPoint const& control_point, FloatPoint const& p1, FloatPoint const& p2, Function<void(FloatPoint const&, FloatPoint const&)>&);
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static void for_each_line_segment_on_bezier_curve(FloatPoint const& control_point, FloatPoint const& p1, FloatPoint const& p2, Function<void(FloatPoint const&, FloatPoint const&)>&&);
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static void for_each_line_segment_on_cubic_bezier_curve(FloatPoint const& control_point_0, FloatPoint const& control_point_1, FloatPoint const& p1, FloatPoint const& p2, Function<void(FloatPoint const&, FloatPoint const&)>&);
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static void for_each_line_segment_on_cubic_bezier_curve(FloatPoint const& control_point_0, FloatPoint const& control_point_1, FloatPoint const& p1, FloatPoint const& p2, Function<void(FloatPoint const&, FloatPoint const&)>&&);
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static void for_each_line_segment_on_elliptical_arc(FloatPoint const& p1, FloatPoint const& p2, FloatPoint const& center, FloatPoint const radii, float x_axis_rotation, float theta_1, float theta_delta, Function<void(FloatPoint const&, FloatPoint const&)>&);
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static void for_each_line_segment_on_elliptical_arc(FloatPoint const& p1, FloatPoint const& p2, FloatPoint const& center, FloatPoint const radii, float x_axis_rotation, float theta_1, float theta_delta, Function<void(FloatPoint const&, FloatPoint const&)>&&);
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void stroke_path(Path const&, Color, int thickness);
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enum class WindingRule {
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Nonzero,
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EvenOdd,
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};
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void fill_path(Path const&, Color, WindingRule rule = WindingRule::Nonzero);
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Font const& font() const { return *state().font; }
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void set_font(Font const& font) { state().font = &font; }
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enum class DrawOp {
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Copy,
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Xor,
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Invert
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};
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void set_draw_op(DrawOp op) { state().draw_op = op; }
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DrawOp draw_op() const { return state().draw_op; }
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void add_clip_rect(IntRect const& rect);
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void clear_clip_rect();
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void translate(int dx, int dy) { translate({ dx, dy }); }
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void translate(IntPoint const& delta) { state().translation.translate_by(delta); }
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Gfx::Bitmap* target() { return m_target.ptr(); }
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void save() { m_state_stack.append(m_state_stack.last()); }
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void restore()
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{
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VERIFY(m_state_stack.size() > 1);
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m_state_stack.take_last();
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}
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IntRect clip_rect() const { return state().clip_rect; }
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protected:
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IntPoint translation() const { return state().translation; }
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IntRect to_physical(IntRect const& r) const { return r.translated(translation()) * scale(); }
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IntPoint to_physical(IntPoint const& p) const { return p.translated(translation()) * scale(); }
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int scale() const { return state().scale; }
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void set_physical_pixel_with_draw_op(u32& pixel, Color const&);
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void fill_physical_scanline_with_draw_op(int y, int x, int width, Color const& color);
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void fill_rect_with_draw_op(IntRect const&, Color);
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void blit_with_opacity(IntPoint const&, Gfx::Bitmap const&, IntRect const& src_rect, float opacity, bool apply_alpha = true);
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void draw_physical_pixel(IntPoint const&, Color, int thickness = 1);
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struct State {
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Font const* font;
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IntPoint translation;
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int scale = 1;
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IntRect clip_rect;
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DrawOp draw_op;
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};
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State& state() { return m_state_stack.last(); }
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State const& state() const { return m_state_stack.last(); }
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void fill_physical_rect(IntRect const&, Color);
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IntRect m_clip_origin;
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NonnullRefPtr<Gfx::Bitmap> m_target;
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Vector<State, 4> m_state_stack;
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private:
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Vector<DirectionalRun> split_text_into_directional_runs(Utf8View const&, TextDirection initial_direction);
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bool text_contains_bidirectional_text(Utf8View const&, TextDirection);
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template<typename DrawGlyphFunction>
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void do_draw_text(IntRect const&, Utf8View const& text, Font const&, TextAlignment, TextElision, TextWrapping, DrawGlyphFunction);
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};
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class PainterStateSaver {
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public:
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explicit PainterStateSaver(Painter&);
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~PainterStateSaver();
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private:
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Painter& m_painter;
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};
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String parse_ampersand_string(StringView const&, Optional<size_t>* underline_offset = nullptr);
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}
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