1 files changed, 107 insertions, 0 deletions
diff --git a/accessible/base/StyleInfo.cpp b/accessible/base/StyleInfo.cpp
new file mode 100644
index 0000000000..294ed50562
--- /dev/null
+++ b/accessible/base/StyleInfo.cpp
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set expandtab shiftwidth=2 tabstop=2: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "StyleInfo.h"
+
+#include "mozilla/dom/Element.h"
+#include "nsComputedDOMStyle.h"
+#include "nsCSSProps.h"
+#include "nsIFrame.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+StyleInfo::StyleInfo(dom::Element* aElement) : mElement(aElement) {
+  mComputedStyle =
+      nsComputedDOMStyle::GetComputedStyleNoFlush(aElement, nullptr);
+}
+
+void StyleInfo::Display(nsAString& aValue) {
+  aValue.Truncate();
+  nsAutoCString value;
+  mComputedStyle->GetComputedPropertyValue(eCSSProperty_display, value);
+  CopyUTF8toUTF16(value, aValue);
+}
+
+void StyleInfo::TextAlign(nsAString& aValue) {
+  aValue.Truncate();
+  nsAutoCString value;
+  mComputedStyle->GetComputedPropertyValue(eCSSProperty_text_align, value);
+  CopyUTF8toUTF16(value, aValue);
+}
+
+void StyleInfo::TextIndent(nsAString& aValue) {
+  aValue.Truncate();
+
+  const auto& textIndent = mComputedStyle->StyleText()->mTextIndent;
+  if (textIndent.ConvertsToLength()) {
+    aValue.AppendFloat(textIndent.ToLengthInCSSPixels());
+    aValue.AppendLiteral("px");
+    return;
+  }
+  if (textIndent.ConvertsToPercentage()) {
+    aValue.AppendFloat(textIndent.ToPercentage() * 100);
+    aValue.AppendLiteral("%");
+    return;
+  }
+  // FIXME: This doesn't handle calc in any meaningful way? Probably should just
+  // use the Servo serialization code...
+  aValue.AppendLiteral("0px");
+}
+
+void StyleInfo::Margin(Side aSide, nsAString& aValue) {
+  MOZ_ASSERT(mElement->GetPrimaryFrame(),
+             " mElement->GetPrimaryFrame() needs to be valid pointer");
+  aValue.Truncate();
+
+  nsIFrame* frame = mElement->GetPrimaryFrame();
+
+  // This is here only to guarantee that we do the same as getComputedStyle
+  // does, so that we don't hit precision errors in tests.
+  auto& margin = frame->StyleMargin()->mMargin.Get(aSide);
+  if (margin.ConvertsToLength()) {
+    aValue.AppendFloat(margin.AsLengthPercentage().ToLengthInCSSPixels());
+  } else {
+    nscoord coordVal = frame->GetUsedMargin().Side(aSide);
+    aValue.AppendFloat(CSSPixel::FromAppUnits(coordVal));
+  }
+
+  aValue.AppendLiteral("px");
+}
+
+void StyleInfo::FormatColor(const nscolor& aValue, nsString& aFormattedValue) {
+  // Combine the string like rgb(R, G, B) from nscolor.
+  aFormattedValue.AppendLiteral("rgb(");
+  aFormattedValue.AppendInt(NS_GET_R(aValue));
+  aFormattedValue.AppendLiteral(", ");
+  aFormattedValue.AppendInt(NS_GET_G(aValue));
+  aFormattedValue.AppendLiteral(", ");
+  aFormattedValue.AppendInt(NS_GET_B(aValue));
+  aFormattedValue.Append(')');
+}
+
+void StyleInfo::FormatTextDecorationStyle(uint8_t aValue,
+                                          nsAString& aFormattedValue) {
+  // TODO: When these are enum classes that rust also understands we should just
+  // make an FFI call here.
+  switch (aValue) {
+    case NS_STYLE_TEXT_DECORATION_STYLE_NONE:
+      return aFormattedValue.AssignASCII("-moz-none");
+    case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
+      return aFormattedValue.AssignASCII("solid");
+    case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE:
+      return aFormattedValue.AssignASCII("double");
+    case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
+      return aFormattedValue.AssignASCII("dotted");
+    case NS_STYLE_TEXT_DECORATION_STYLE_DASHED:
+      return aFormattedValue.AssignASCII("dashed");
+    case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
+      return aFormattedValue.AssignASCII("wavy");
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unknown decoration style");
+      break;
+  }
+}