1 files changed, 150 insertions, 0 deletions
diff --git a/gfx/thebes/gfxGlyphExtents.cpp b/gfx/thebes/gfxGlyphExtents.cpp
new file mode 100644
index 0000000000..9c0792481d
--- /dev/null
+++ b/gfx/thebes/gfxGlyphExtents.cpp
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 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 "gfxGlyphExtents.h"
+#include "gfxTextRun.h"
+
+using namespace mozilla;
+
+#ifdef DEBUG_roc
+#  define DEBUG_TEXT_RUN_STORAGE_METRICS
+#endif
+
+#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
+extern uint32_t gTextRunStorageHighWaterMark;
+extern uint32_t gTextRunStorage;
+extern uint32_t gFontCount;
+extern uint32_t gGlyphExtentsCount;
+extern uint32_t gGlyphExtentsWidthsTotalSize;
+extern uint32_t gGlyphExtentsSetupEagerSimple;
+extern uint32_t gGlyphExtentsSetupEagerTight;
+extern uint32_t gGlyphExtentsSetupLazyTight;
+extern uint32_t gGlyphExtentsSetupFallBackToTight;
+#endif
+
+gfxGlyphExtents::~gfxGlyphExtents() {
+#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
+  gGlyphExtentsWidthsTotalSize +=
+      mContainedGlyphWidths.SizeOfExcludingThis(&FontCacheMallocSizeOf);
+  gGlyphExtentsCount++;
+#endif
+  MOZ_COUNT_DTOR(gfxGlyphExtents);
+}
+
+bool gfxGlyphExtents::GetTightGlyphExtentsAppUnitsLocked(
+    gfxFont* aFont, DrawTarget* aDrawTarget, uint32_t aGlyphID,
+    gfxRect* aExtents) {
+  HashEntry* entry = mTightGlyphExtents.GetEntry(aGlyphID);
+  if (!entry) {
+    // Some functions higher up in the call chain deliberately pass in a
+    // nullptr DrawTarget, e.g. GetBaselinePosition() passes nullptr to
+    // gfxTextRun::MeasureText() and that nullptr reaches here.
+    if (!aDrawTarget) {
+      NS_WARNING("Could not get glyph extents (no aDrawTarget)");
+      return false;
+    }
+
+#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
+    ++gGlyphExtentsSetupLazyTight;
+#endif
+    // We need to temporarily release the read lock, as SetupGlyphExtents will
+    // take a write lock internally when it wants to set the new entry.
+    MOZ_PUSH_IGNORE_THREAD_SAFETY
+    mLock.ReadUnlock();
+    aFont->SetupGlyphExtents(aDrawTarget, aGlyphID, true, this);
+    mLock.ReadLock();
+    MOZ_POP_THREAD_SAFETY
+
+    entry = mTightGlyphExtents.GetEntry(aGlyphID);
+    if (!entry) {
+      NS_WARNING("Could not get glyph extents");
+      return false;
+    }
+  }
+
+  *aExtents = gfxRect(entry->x, entry->y, entry->width, entry->height);
+  return true;
+}
+
+gfxGlyphExtents::GlyphWidths::~GlyphWidths() {
+  uint32_t i, count = mBlocks.Length();
+  for (i = 0; i < count; ++i) {
+    uintptr_t bits = mBlocks[i];
+    if (bits && !(bits & 0x1)) {
+      delete[] reinterpret_cast<uint16_t*>(bits);
+    }
+  }
+}
+
+uint32_t gfxGlyphExtents::GlyphWidths::SizeOfExcludingThis(
+    MallocSizeOf aMallocSizeOf) const {
+  uint32_t i;
+  uint32_t size = mBlocks.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (i = 0; i < mBlocks.Length(); ++i) {
+    uintptr_t bits = mBlocks[i];
+    if (bits && !(bits & 0x1)) {
+      size += aMallocSizeOf(reinterpret_cast<void*>(bits));
+    }
+  }
+  return size;
+}
+
+void gfxGlyphExtents::GlyphWidths::Set(uint32_t aGlyphID, uint16_t aWidth) {
+  uint32_t block = aGlyphID >> BLOCK_SIZE_BITS;
+  uint32_t len = mBlocks.Length();
+  if (block >= len) {
+    uintptr_t* elems = mBlocks.AppendElements(block + 1 - len);
+    if (!elems) return;
+    memset(elems, 0, sizeof(uintptr_t) * (block + 1 - len));
+  }
+
+  uintptr_t bits = mBlocks[block];
+  uint32_t glyphOffset = aGlyphID & (BLOCK_SIZE - 1);
+  if (!bits) {
+    mBlocks[block] = MakeSingle(glyphOffset, aWidth);
+    return;
+  }
+
+  uint16_t* newBlock;
+  if (bits & 0x1) {
+    // Expand the block to a real block. We could avoid this by checking
+    // glyphOffset == GetGlyphOffset(bits), but that never happens so don't
+    // bother
+    newBlock = new uint16_t[BLOCK_SIZE];
+    if (!newBlock) return;
+    uint32_t i;
+    for (i = 0; i < BLOCK_SIZE; ++i) {
+      newBlock[i] = INVALID_WIDTH;
+    }
+    newBlock[GetGlyphOffset(bits)] = GetWidth(bits);
+    mBlocks[block] = reinterpret_cast<uintptr_t>(newBlock);
+  } else {
+    newBlock = reinterpret_cast<uint16_t*>(bits);
+  }
+  newBlock[glyphOffset] = aWidth;
+}
+
+void gfxGlyphExtents::SetTightGlyphExtents(uint32_t aGlyphID,
+                                           const gfxRect& aExtentsAppUnits) {
+  AutoWriteLock lock(mLock);
+  HashEntry* entry = mTightGlyphExtents.PutEntry(aGlyphID);
+  if (!entry) {
+    return;
+  }
+  entry->x = aExtentsAppUnits.X();
+  entry->y = aExtentsAppUnits.Y();
+  entry->width = aExtentsAppUnits.Width();
+  entry->height = aExtentsAppUnits.Height();
+}
+
+size_t gfxGlyphExtents::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
+  AutoReadLock lock(mLock);
+  return mContainedGlyphWidths.SizeOfExcludingThis(aMallocSizeOf) +
+         mTightGlyphExtents.ShallowSizeOfExcludingThis(aMallocSizeOf);
+}
+
+size_t gfxGlyphExtents::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
+  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}