mirror of
https://github.com/RGBCube/serenity
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b7fd844c9d
This a simple RAII helper for the BorderRadiusCornerClipper it samples under the corners on construction, then blits them back on exiting the scope. This encapsulates a fairly common pattern.
91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/*
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* Copyright (c) 2022, 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 <LibGfx/AntiAliasingPainter.h>
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#include <LibWeb/Painting/BorderPainting.h>
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namespace Web::Painting {
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enum class CornerClip {
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Outside,
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Inside
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};
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class BorderRadiusCornerClipper {
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public:
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enum class UseCachedBitmap {
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Yes,
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No
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};
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static ErrorOr<BorderRadiusCornerClipper> create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip = CornerClip::Outside, UseCachedBitmap use_cached_bitmap = UseCachedBitmap::Yes);
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void sample_under_corners(Gfx::Painter& page_painter);
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void blit_corner_clipping(Gfx::Painter& page_painter);
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private:
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using CornerRadius = Gfx::AntiAliasingPainter::CornerRadius;
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struct CornerData {
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struct CornerRadii {
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CornerRadius top_left;
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CornerRadius top_right;
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CornerRadius bottom_right;
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CornerRadius bottom_left;
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} corner_radii;
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struct CornerLocations {
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Gfx::IntPoint top_left;
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Gfx::IntPoint top_right;
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Gfx::IntPoint bottom_right;
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Gfx::IntPoint bottom_left;
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};
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CornerLocations page_locations;
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CornerLocations bitmap_locations;
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Gfx::IntSize corner_bitmap_size;
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} m_data;
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NonnullRefPtr<Gfx::Bitmap> m_corner_bitmap;
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bool m_has_sampled { false };
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CornerClip m_corner_clip { false };
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BorderRadiusCornerClipper(CornerData corner_data, NonnullRefPtr<Gfx::Bitmap> corner_bitmap, CornerClip corner_clip)
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: m_data(move(corner_data))
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, m_corner_bitmap(corner_bitmap)
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, m_corner_clip(corner_clip)
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{
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}
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};
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struct ScopedCornerRadiusClip {
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ScopedCornerRadiusClip(Gfx::Painter& painter, Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip = CornerClip::Outside, BorderRadiusCornerClipper::UseCachedBitmap use_cached_bitmap = BorderRadiusCornerClipper::UseCachedBitmap::Yes)
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: m_painter(painter)
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{
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if (border_radii.has_any_radius()) {
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auto clipper = BorderRadiusCornerClipper::create(border_rect, border_radii, corner_clip, use_cached_bitmap);
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if (!clipper.is_error()) {
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m_corner_clipper = clipper.release_value();
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m_corner_clipper->sample_under_corners(m_painter);
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}
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}
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}
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~ScopedCornerRadiusClip()
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{
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if (m_corner_clipper.has_value()) {
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m_corner_clipper->blit_corner_clipping(m_painter);
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}
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}
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AK_MAKE_NONMOVABLE(ScopedCornerRadiusClip);
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AK_MAKE_NONCOPYABLE(ScopedCornerRadiusClip);
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private:
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Gfx::Painter& m_painter;
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Optional<BorderRadiusCornerClipper> m_corner_clipper;
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};
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}
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