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https://github.com/RGBCube/serenity
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063e66cae9
This modification introduces a new layer to the painting process. The stacking context traversal no longer immediately calls the Gfx::Painter methods. Instead, it writes serialized painting commands into newly introduced RecordingPainter. Created list of commands is executed later to produce resulting bitmap. Producing painting command list will make it easier to add new optimizations: - It's simpler to check if the painting result is not visible in the viewport at the command level rather than during stacking context traversal. - Run painting in a separate thread. The painting thread can process serialized painting commands, while the main thread can work on the next paintable tree and safely invalidate the previous one. - As we consider GPU-accelerated painting support, it would be easier to back each painting command rather than constructing an alternative for the entire Gfx::Painter API.
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Sam Atkins <atkinssj@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/Vector.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Palette.h>
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#include <LibGfx/Rect.h>
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#include <LibWeb/Painting/RecordingPainter.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web {
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class PaintContext {
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public:
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PaintContext(Painting::RecordingPainter& painter, Palette const& palette, double device_pixels_per_css_pixel);
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Painting::RecordingPainter& painter() const { return m_painter; }
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Palette const& palette() const { return m_palette; }
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bool should_show_line_box_borders() const { return m_should_show_line_box_borders; }
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void set_should_show_line_box_borders(bool value) { m_should_show_line_box_borders = value; }
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DevicePixelRect device_viewport_rect() const { return m_device_viewport_rect; }
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void set_device_viewport_rect(DevicePixelRect const& rect) { m_device_viewport_rect = rect; }
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CSSPixelRect css_viewport_rect() const;
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bool has_focus() const { return m_focus; }
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void set_has_focus(bool focus) { m_focus = focus; }
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void set_svg_transform(Gfx::AffineTransform transform)
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{
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m_svg_transform = transform;
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}
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Gfx::AffineTransform const& svg_transform() const
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{
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return m_svg_transform;
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}
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DevicePixels enclosing_device_pixels(CSSPixels css_pixels) const;
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DevicePixels floored_device_pixels(CSSPixels css_pixels) const;
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DevicePixels rounded_device_pixels(CSSPixels css_pixels) const;
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DevicePixelPoint rounded_device_point(CSSPixelPoint) const;
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DevicePixelPoint floored_device_point(CSSPixelPoint) const;
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DevicePixelRect enclosing_device_rect(CSSPixelRect) const;
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DevicePixelRect rounded_device_rect(CSSPixelRect) const;
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DevicePixelSize enclosing_device_size(CSSPixelSize) const;
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DevicePixelSize rounded_device_size(CSSPixelSize) const;
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CSSPixels scale_to_css_pixels(DevicePixels) const;
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CSSPixelPoint scale_to_css_point(DevicePixelPoint) const;
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CSSPixelSize scale_to_css_size(DevicePixelSize) const;
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CSSPixelRect scale_to_css_rect(DevicePixelRect) const;
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PaintContext clone(Painting::RecordingPainter& painter) const
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{
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auto clone = PaintContext(painter, m_palette, m_device_pixels_per_css_pixel);
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clone.m_device_viewport_rect = m_device_viewport_rect;
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clone.m_should_show_line_box_borders = m_should_show_line_box_borders;
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clone.m_focus = m_focus;
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return clone;
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}
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double device_pixels_per_css_pixel() const { return m_device_pixels_per_css_pixel; }
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CSSPixelPoint scroll_offset() const { return m_scroll_offset; }
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void translate_scroll_offset_by(CSSPixelPoint offset) { m_scroll_offset.translate_by(offset); }
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private:
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Painting::RecordingPainter& m_painter;
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Palette m_palette;
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double m_device_pixels_per_css_pixel { 0 };
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DevicePixelRect m_device_viewport_rect;
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bool m_should_show_line_box_borders { false };
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bool m_focus { false };
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CSSPixelPoint m_scroll_offset;
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Gfx::AffineTransform m_svg_transform;
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};
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}
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