LibWeb: Begin SVG element support

This commit starts adding a basic SVG element. Currently, svg elements
have support for the width and height properties, as well as the stroke,
stroke-width, and fill properties. The only child element supported
is the path element, as most other graphical elements are just shorthand
for paths.

2 files changed, 117 insertions, 0 deletions

diff --git a/Libraries/LibWeb/Layout/LayoutSvg.cpp b/Libraries/LibWeb/Layout/LayoutSvg.cpp
new file mode 100644
index 0000000000..c282e4c98a
--- /dev/null
+++ b/Libraries/LibWeb/Layout/LayoutSvg.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * 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 <LibGUI/Painter.h>
+#include <LibGfx/Font.h>
+#include <LibGfx/StylePainter.h>
+#include <LibWeb/Layout/LayoutSvg.h>
+
+namespace Web {
+
+LayoutSvg::LayoutSvg(Document& document, const HTMLSvgElement& element, NonnullRefPtr<StyleProperties> style)
+    : LayoutReplaced(document, element, move(style))
+{
+}
+
+void LayoutSvg::layout(LayoutMode layout_mode)
+{
+    set_has_intrinsic_width(true);
+    set_has_intrinsic_height(true);
+    set_intrinsic_width(node().width());
+    set_intrinsic_height(node().height());
+    LayoutReplaced::layout(layout_mode);
+}
+
+void LayoutSvg::paint(PaintContext& context, PaintPhase phase)
+{
+    if (!is_visible())
+        return;
+
+    LayoutReplaced::paint(context, phase);
+
+    if (phase == PaintPhase::Foreground) {
+        if (!context.viewport_rect().intersects(enclosing_int_rect(absolute_rect())))
+            return;
+
+        if (!node().bitmap())
+            node().create_bitmap();
+
+        ASSERT(node().bitmap());
+        context.painter().draw_scaled_bitmap(enclosing_int_rect(absolute_rect()), *node().bitmap(), node().bitmap()->rect());
+    }
+}
+
+}
diff --git a/Libraries/LibWeb/Layout/LayoutSvg.h b/Libraries/LibWeb/Layout/LayoutSvg.h
new file mode 100644
index 0000000000..dd5035c201
--- /dev/null
+++ b/Libraries/LibWeb/Layout/LayoutSvg.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * 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.
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/HTMLSvgElement.h>
+#include <LibWeb/Layout/LayoutReplaced.h>
+
+namespace Web {
+
+class HTMLSvgElement;
+
+class LayoutSvg : public LayoutReplaced {
+public:
+    LayoutSvg(Document&, const HTMLSvgElement&, NonnullRefPtr<StyleProperties>);
+    virtual ~LayoutSvg() override = default;
+    virtual void layout(LayoutMode = LayoutMode::Default) override;
+    virtual void paint(PaintContext&, PaintPhase) override;
+
+    HTMLSvgElement& node() { return static_cast<HTMLSvgElement&>(LayoutReplaced::node()); }
+
+private:
+    virtual const char* class_name() const override { return "LayoutSvg"; }
+    virtual bool is_canvas() const override { return true; }
+};
+
+}