import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/style/nsFontFaceUtils.cpp

@@ -0,0 +1,151 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+// vim:cindent:ts=2:et:sw=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 "gfxUserFontSet.h"
+#include "nsFontFaceUtils.h"
+#include "nsFontMetrics.h"
+#include "nsIFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsPlaceholderFrame.h"
+#include "nsTArray.h"
+#include "SVGTextFrame.h"
+
+static bool
+StyleContextContainsFont(nsStyleContext* aStyleContext,
+                         const gfxUserFontSet* aUserFontSet,
+                         const gfxUserFontEntry* aFont)
+{
+  // if the font is null, simply check to see whether fontlist includes
+  // downloadable fonts
+  if (!aFont) {
+    const mozilla::FontFamilyList& fontlist =
+      aStyleContext->StyleFont()->mFont.fontlist;
+    return aUserFontSet->ContainsUserFontSetFonts(fontlist);
+  }
+
+  // first, check if the family name is in the fontlist
+  const nsString& familyName = aFont->FamilyName();
+  if (!aStyleContext->StyleFont()->mFont.fontlist.Contains(familyName)) {
+    return false;
+  }
+
+  // family name is in the fontlist, check to see if the font group
+  // associated with the frame includes the specific userfont
+  RefPtr<nsFontMetrics> fm =
+    nsLayoutUtils::GetFontMetricsForStyleContext(aStyleContext, 1.0f);
+
+  if (fm->GetThebesFontGroup()->ContainsUserFont(aFont)) {
+    return true;
+  }
+
+  return false;
+}
+
+static bool
+FrameUsesFont(nsIFrame* aFrame, const gfxUserFontEntry* aFont)
+{
+  // check the style context of the frame
+  gfxUserFontSet* ufs = aFrame->PresContext()->GetUserFontSet();
+  if (StyleContextContainsFont(aFrame->StyleContext(), ufs, aFont)) {
+    return true;
+  }
+
+  // check additional style contexts
+  int32_t contextIndex = 0;
+  for (nsStyleContext* extraContext;
+       (extraContext = aFrame->GetAdditionalStyleContext(contextIndex));
+       ++contextIndex) {
+    if (StyleContextContainsFont(extraContext, ufs, aFont)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+static void
+ScheduleReflow(nsIPresShell* aShell, nsIFrame* aFrame)
+{
+  nsIFrame* f = aFrame;
+  if (f->IsFrameOfType(nsIFrame::eSVG) || f->IsSVGText()) {
+    // SVG frames (and the non-SVG descendants of an SVGTextFrame) need special
+    // reflow handling.  We need to search upwards for the first displayed
+    // nsSVGOuterSVGFrame or non-SVG frame, which is the frame we can call
+    // FrameNeedsReflow on.  (This logic is based on
+    // nsSVGUtils::ScheduleReflowSVG and
+    // SVGTextFrame::ScheduleReflowSVGNonDisplayText.)
+    if (f->GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
+      while (f) {
+        if (!(f->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
+          if (NS_SUBTREE_DIRTY(f)) {
+            // This is a displayed frame, so if it is already dirty, we
+            // will be reflowed soon anyway.  No need to call
+            // FrameNeedsReflow again, then.
+            return;
+          }
+          if (f->GetStateBits() & NS_STATE_IS_OUTER_SVG ||
+              !(f->IsFrameOfType(nsIFrame::eSVG) || f->IsSVGText())) {
+            break;
+          }
+          f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
+        }
+        f = f->GetParent();
+      }
+      MOZ_ASSERT(f, "should have found an ancestor frame to reflow");
+    }
+  }
+
+  aShell->FrameNeedsReflow(f, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
+}
+
+/* static */ void
+nsFontFaceUtils::MarkDirtyForFontChange(nsIFrame* aSubtreeRoot,
+                                        const gfxUserFontEntry* aFont)
+{
+  AutoTArray<nsIFrame*, 4> subtrees;
+  subtrees.AppendElement(aSubtreeRoot);
+
+  nsIPresShell* ps = aSubtreeRoot->PresContext()->PresShell();
+
+  // check descendants, iterating over subtrees that may include
+  // additional subtrees associated with placeholders
+  do {
+    nsIFrame* subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
+    subtrees.RemoveElementAt(subtrees.Length() - 1);
+
+    // Check all descendants to see if they use the font
+    AutoTArray<nsIFrame*, 32> stack;
+    stack.AppendElement(subtreeRoot);
+
+    do {
+      nsIFrame* f = stack.ElementAt(stack.Length() - 1);
+      stack.RemoveElementAt(stack.Length() - 1);
+
+      // if this frame uses the font, mark its descendants dirty
+      // and skip checking its children
+      if (FrameUsesFont(f, aFont)) {
+        ScheduleReflow(ps, f);
+      } else {
+        if (f->GetType() == nsGkAtoms::placeholderFrame) {
+          nsIFrame* oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
+          if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
+            // We have another distinct subtree we need to mark.
+            subtrees.AppendElement(oof);
+          }
+        }
+
+        nsIFrame::ChildListIterator lists(f);
+        for (; !lists.IsDone(); lists.Next()) {
+          nsFrameList::Enumerator childFrames(lists.CurrentList());
+          for (; !childFrames.AtEnd(); childFrames.Next()) {
+            nsIFrame* kid = childFrames.get();
+            stack.AppendElement(kid);
+          }
+        }
+      }
+    } while (!stack.IsEmpty());
+  } while (!subtrees.IsEmpty());
+}