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Diffstat (limited to 'Libraries/LibWeb/Painting/BorderPainting.cpp')
| -rw-r--r-- | Libraries/LibWeb/Painting/BorderPainting.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/Libraries/LibWeb/Painting/BorderPainting.cpp b/Libraries/LibWeb/Painting/BorderPainting.cpp new file mode 100644 index 0000000000..d3721245e2 --- /dev/null +++ b/Libraries/LibWeb/Painting/BorderPainting.cpp @@ -0,0 +1,162 @@ +/* + * Copyright (c) 2020, Andreas Kling <kling@serenityos.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <LibGfx/Painter.h> +#include <LibWeb/Painting/BorderPainting.h> +#include <LibWeb/Painting/PaintContext.h> + +namespace Web::Painting { + +void paint_border(PaintContext& context, BorderEdge edge, const Gfx::FloatRect& rect, const LayoutStyle& style) +{ + const auto& border_data = [&] { + switch (edge) { + case BorderEdge::Top: + return style.border_top(); + case BorderEdge::Right: + return style.border_right(); + case BorderEdge::Bottom: + return style.border_bottom(); + default: // BorderEdge::Left: + return style.border_left(); + } + }(); + + float width = border_data.width; + if (width <= 0) + return; + + auto color = border_data.color; + auto border_style = border_data.line_style; + int int_width = max((int)width, 1); + + struct Points { + Gfx::FloatPoint p1; + Gfx::FloatPoint p2; + }; + + auto points_for_edge = [](BorderEdge edge, const Gfx::FloatRect& rect) -> Points { + switch (edge) { + case BorderEdge::Top: + return { rect.top_left(), rect.top_right() }; + case BorderEdge::Right: + return { rect.top_right(), rect.bottom_right() }; + case BorderEdge::Bottom: + return { rect.bottom_left(), rect.bottom_right() }; + default: // Edge::Left + return { rect.top_left(), rect.bottom_left() }; + } + }; + + auto [p1, p2] = points_for_edge(edge, rect); + + if (border_style == CSS::LineStyle::Inset) { + auto top_left_color = Color::from_rgb(0x5a5a5a); + auto bottom_right_color = Color::from_rgb(0x888888); + color = (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color; + } else if (border_style == CSS::LineStyle::Outset) { + auto top_left_color = Color::from_rgb(0x888888); + auto bottom_right_color = Color::from_rgb(0x5a5a5a); + color = (edge == BorderEdge::Left || edge == BorderEdge::Top) ? top_left_color : bottom_right_color; + } + + auto gfx_line_style = Gfx::Painter::LineStyle::Solid; + if (border_style == CSS::LineStyle::Dotted) + gfx_line_style = Gfx::Painter::LineStyle::Dotted; + if (border_style == CSS::LineStyle::Dashed) + gfx_line_style = Gfx::Painter::LineStyle::Dashed; + + if (gfx_line_style != Gfx::Painter::LineStyle::Solid) { + switch (edge) { + case BorderEdge::Top: + p1.move_by(int_width / 2, int_width / 2); + p2.move_by(-int_width / 2, int_width / 2); + break; + case BorderEdge::Right: + p1.move_by(-int_width / 2, int_width / 2); + p2.move_by(-int_width / 2, -int_width / 2); + break; + case BorderEdge::Bottom: + p1.move_by(int_width / 2, -int_width / 2); + p2.move_by(-int_width / 2, -int_width / 2); + break; + case BorderEdge::Left: + p1.move_by(int_width / 2, int_width / 2); + p2.move_by(int_width / 2, -int_width / 2); + break; + } + context.painter().draw_line({ (int)p1.x(), (int)p1.y() }, { (int)p2.x(), (int)p2.y() }, color, int_width, gfx_line_style); + return; + } + + auto draw_line = [&](auto& p1, auto& p2) { + context.painter().draw_line({ (int)p1.x(), (int)p1.y() }, { (int)p2.x(), (int)p2.y() }, color, 1, gfx_line_style); + }; + + float p1_step = 0; + float p2_step = 0; + + switch (edge) { + case BorderEdge::Top: + p1_step = style.border_left().width / (float)int_width; + p2_step = style.border_right().width / (float)int_width; + for (int i = 0; i < int_width; ++i) { + draw_line(p1, p2); + p1.move_by(p1_step, 1); + p2.move_by(-p2_step, 1); + } + break; + case BorderEdge::Right: + p1_step = style.border_top().width / (float)int_width; + p2_step = style.border_bottom().width / (float)int_width; + for (int i = int_width - 1; i >= 0; --i) { + draw_line(p1, p2); + p1.move_by(-1, p1_step); + p2.move_by(-1, -p2_step); + } + break; + case BorderEdge::Bottom: + p1_step = style.border_left().width / (float)int_width; + p2_step = style.border_right().width / (float)int_width; + for (int i = int_width - 1; i >= 0; --i) { + draw_line(p1, p2); + p1.move_by(p1_step, -1); + p2.move_by(-p2_step, -1); + } + break; + case BorderEdge::Left: + p1_step = style.border_top().width / (float)int_width; + p2_step = style.border_bottom().width / (float)int_width; + for (int i = 0; i < int_width; ++i) { + draw_line(p1, p2); + p1.move_by(1, p1_step); + p2.move_by(1, -p2_step); + } + break; + } +} + +} |