Add m-esr52 at 52.6.0

1 files changed, 222 insertions, 0 deletions

diff --git a/layout/generic/nsTextRunTransformations.h b/layout/generic/nsTextRunTransformations.h
new file mode 100644
index 000000000..662a5d2f8
--- /dev/null
+++ b/layout/generic/nsTextRunTransformations.h
@@ -0,0 +1,222 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef NSTEXTRUNTRANSFORMATIONS_H_
+#define NSTEXTRUNTRANSFORMATIONS_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/UniquePtr.h"
+#include "gfxTextRun.h"
+#include "nsStyleContext.h"
+
+class nsTransformedTextRun;
+
+struct nsTransformedCharStyle final {
+  NS_INLINE_DECL_REFCOUNTING(nsTransformedCharStyle)
+
+  explicit nsTransformedCharStyle(nsStyleContext* aContext)
+    : mFont(aContext->StyleFont()->mFont)
+    , mLanguage(aContext->StyleFont()->mLanguage)
+    , mPresContext(aContext->PresContext())
+    , mScriptSizeMultiplier(aContext->StyleFont()->mScriptSizeMultiplier)
+    , mTextTransform(aContext->StyleText()->mTextTransform)
+    , mMathVariant(aContext->StyleFont()->mMathVariant)
+    , mExplicitLanguage(aContext->StyleFont()->mExplicitLanguage) {}
+
+  nsFont                  mFont;
+  nsCOMPtr<nsIAtom>       mLanguage;
+  RefPtr<nsPresContext> mPresContext;
+  float                   mScriptSizeMultiplier;
+  uint8_t                 mTextTransform;
+  uint8_t                 mMathVariant;
+  bool                    mExplicitLanguage;
+  bool                    mForceNonFullWidth = false;
+
+private:
+  ~nsTransformedCharStyle() {}
+  nsTransformedCharStyle(const nsTransformedCharStyle& aOther) = delete;
+  nsTransformedCharStyle& operator=(const nsTransformedCharStyle& aOther) = delete;
+};
+
+class nsTransformingTextRunFactory {
+public:
+  virtual ~nsTransformingTextRunFactory() {}
+
+  // Default 8-bit path just transforms to Unicode and takes that path
+  already_AddRefed<nsTransformedTextRun>
+  MakeTextRun(const uint8_t* aString, uint32_t aLength,
+              const gfxFontGroup::Parameters* aParams,
+              gfxFontGroup* aFontGroup, uint32_t aFlags,
+              nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+              bool aOwnsFactory);
+
+  already_AddRefed<nsTransformedTextRun>
+  MakeTextRun(const char16_t* aString, uint32_t aLength,
+              const gfxFontGroup::Parameters* aParams,
+              gfxFontGroup* aFontGroup, uint32_t aFlags,
+              nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+              bool aOwnsFactory);
+
+  virtual void RebuildTextRun(nsTransformedTextRun* aTextRun,
+                              mozilla::gfx::DrawTarget* aRefDrawTarget,
+                              gfxMissingFontRecorder* aMFR) = 0;
+};
+
+/**
+ * Builds textruns that transform the text in some way (e.g., capitalize)
+ * and then render the text using some other textrun implementation.
+ */
+class nsCaseTransformTextRunFactory : public nsTransformingTextRunFactory {
+public:
+  // We could add an optimization here so that when there is no inner
+  // factory, no title-case conversion, and no upper-casing of SZLIG, we override
+  // MakeTextRun (after making it virtual in the superclass) and have it
+  // just convert the string to uppercase or lowercase and create the textrun
+  // via the fontgroup.
+  
+  // Takes ownership of aInnerTransformTextRunFactory
+  explicit nsCaseTransformTextRunFactory(UniquePtr<nsTransformingTextRunFactory> aInnerTransformingTextRunFactory,
+                                         bool aAllUppercase = false)
+    : mInnerTransformingTextRunFactory(Move(aInnerTransformingTextRunFactory)),
+      mAllUppercase(aAllUppercase) {}
+
+  virtual void RebuildTextRun(nsTransformedTextRun* aTextRun,
+                              mozilla::gfx::DrawTarget* aRefDrawTarget,
+                              gfxMissingFontRecorder* aMFR) override;
+
+  // Perform a transformation on the given string, writing the result into
+  // aConvertedString. If aAllUppercase is true, the transform is (global)
+  // upper-casing, and aLanguage is used to determine any language-specific
+  // behavior; otherwise, an nsTransformedTextRun should be passed in
+  // as aTextRun and its styles will be used to determine the transform(s)
+  // to be applied.
+  // If such an input textrun is provided, then its line-breaks and styles
+  // will be copied to the output arrays, which must also be provided by
+  // the caller. For the global upper-casing usage (no input textrun),
+  // these are ignored.
+  static bool TransformString(const nsAString& aString,
+                              nsString& aConvertedString,
+                              bool aAllUppercase,
+                              const nsIAtom* aLanguage,
+                              nsTArray<bool>& aCharsToMergeArray,
+                              nsTArray<bool>& aDeletedCharsArray,
+                              const nsTransformedTextRun* aTextRun = nullptr,
+                              uint32_t aOffsetInTextRun = 0,
+                              nsTArray<uint8_t>* aCanBreakBeforeArray = nullptr,
+                              nsTArray<RefPtr<nsTransformedCharStyle>>* aStyleArray = nullptr);
+
+protected:
+  mozilla::UniquePtr<nsTransformingTextRunFactory> mInnerTransformingTextRunFactory;
+  bool mAllUppercase;
+};
+
+/**
+ * So that we can reshape as necessary, we store enough information
+ * to fully rebuild the textrun contents.
+ */
+class nsTransformedTextRun final : public gfxTextRun {
+public:
+
+  static already_AddRefed<nsTransformedTextRun>
+  Create(const gfxTextRunFactory::Parameters* aParams,
+         nsTransformingTextRunFactory* aFactory,
+         gfxFontGroup* aFontGroup,
+         const char16_t* aString, uint32_t aLength,
+         const uint32_t aFlags,
+         nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+         bool aOwnsFactory);
+
+  ~nsTransformedTextRun() {
+    if (mOwnsFactory) {
+      delete mFactory;
+    }
+  }
+  
+  void SetCapitalization(uint32_t aStart, uint32_t aLength,
+                         bool* aCapitalization);
+  virtual bool SetPotentialLineBreaks(Range aRange,
+                                      const uint8_t* aBreakBefore);
+  /**
+   * Called after SetCapitalization and SetPotentialLineBreaks
+   * are done and before we request any data from the textrun. Also always
+   * called after a Create.
+   */
+  void FinishSettingProperties(mozilla::gfx::DrawTarget* aRefDrawTarget,
+                               gfxMissingFontRecorder* aMFR)
+  {
+    if (mNeedsRebuild) {
+      mNeedsRebuild = false;
+      mFactory->RebuildTextRun(this, aRefDrawTarget, aMFR);
+    }
+  }
+
+  // override the gfxTextRun impls to account for additional members here
+  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
+  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) MOZ_MUST_OVERRIDE;
+
+  nsTransformingTextRunFactory       *mFactory;
+  nsTArray<RefPtr<nsTransformedCharStyle>> mStyles;
+  nsTArray<bool>                      mCapitalize;
+  nsString                            mString;
+  bool                                mOwnsFactory;
+  bool                                mNeedsRebuild;
+
+private:
+  nsTransformedTextRun(const gfxTextRunFactory::Parameters* aParams,
+                       nsTransformingTextRunFactory* aFactory,
+                       gfxFontGroup* aFontGroup,
+                       const char16_t* aString, uint32_t aLength,
+                       const uint32_t aFlags,
+                       nsTArray<RefPtr<nsTransformedCharStyle>>&& aStyles,
+                       bool aOwnsFactory)
+    : gfxTextRun(aParams, aLength, aFontGroup, aFlags),
+      mFactory(aFactory), mStyles(aStyles), mString(aString, aLength),
+      mOwnsFactory(aOwnsFactory), mNeedsRebuild(true)
+  {
+    mCharacterGlyphs = reinterpret_cast<CompressedGlyph*>(this + 1);
+  }
+};
+
+/**
+ * Copy a given textrun, but merge certain characters into a single logical
+ * character. Glyphs for a character are added to the glyph list for the previous
+ * character and then the merged character is eliminated. Visually the results
+ * are identical.
+ *
+ * This is used for text-transform:uppercase when we encounter a SZLIG,
+ * whose uppercase form is "SS", or other ligature or precomposed form
+ * that expands to multiple codepoints during case transformation,
+ * and for Greek text when combining diacritics have been deleted.
+ *
+ * This function is unable to merge characters when they occur in different
+ * glyph runs. This only happens in tricky edge cases where a character was
+ * decomposed by case-mapping (e.g. there's no precomposed uppercase version
+ * of an accented lowercase letter), and then font-matching caused the
+ * diacritics to be assigned to a different font than the base character.
+ * In this situation, the diacritic(s) get discarded, which is less than
+ * ideal, but they probably weren't going to render very well anyway.
+ * Bug 543200 will improve this by making font-matching operate on entire
+ * clusters instead of individual codepoints.
+ *
+ * For simplicity, this produces a textrun containing all DetailedGlyphs,
+ * no simple glyphs. So don't call it unless you really have merging to do.
+ *
+ * @param aCharsToMerge when aCharsToMerge[i] is true, this character in aSrc
+ * is merged into the previous character
+ *
+ * @param aDeletedChars when aDeletedChars[i] is true, the character at this
+ * position in aDest was deleted (has no corresponding char in aSrc)
+ */
+void
+MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc,
+                         const bool* aCharsToMerge, const bool* aDeletedChars);
+
+gfxTextRunFactory::Parameters
+GetParametersForInner(nsTransformedTextRun* aTextRun, uint32_t* aFlags,
+                      mozilla::gfx::DrawTarget* aRefDrawTarget);
+
+
+#endif /*NSTEXTRUNTRANSFORMATIONS_H_*/