1 files changed, 216 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/ports/SkFontMgr_android_parser.h b/gfx/skia/skia/src/ports/SkFontMgr_android_parser.h
new file mode 100644
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+++ b/gfx/skia/skia/src/ports/SkFontMgr_android_parser.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2011 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkFontMgr_android_parser_DEFINED
+#define SkFontMgr_android_parser_DEFINED
+
+#include "include/core/SkFontMgr.h"
+#include "include/core/SkString.h"
+#include "include/core/SkTypes.h"
+#include "include/private/base/SkTArray.h"
+#include "include/private/base/SkTDArray.h"
+#include "src/core/SkTHash.h"
+
+#include <climits>
+#include <limits>
+
+/** \class SkLanguage
+
+    The SkLanguage class represents a human written language, and is used by
+    text draw operations to determine which glyph to draw when drawing
+    characters with variants (ie Han-derived characters).
+*/
+class SkLanguage {
+public:
+    SkLanguage() { }
+    SkLanguage(const SkString& tag) : fTag(tag) { }
+    SkLanguage(const char* tag) : fTag(tag) { }
+    SkLanguage(const char* tag, size_t len) : fTag(tag, len) { }
+    SkLanguage(const SkLanguage& b) : fTag(b.fTag) { }
+
+    /** Gets a BCP 47 language identifier for this SkLanguage.
+        @return a BCP 47 language identifier representing this language
+    */
+    const SkString& getTag() const { return fTag; }
+
+    /** Performs BCP 47 fallback to return an SkLanguage one step more general.
+        @return an SkLanguage one step more general
+    */
+    SkLanguage getParent() const;
+
+    bool operator==(const SkLanguage& b) const {
+        return fTag == b.fTag;
+    }
+    bool operator!=(const SkLanguage& b) const {
+        return fTag != b.fTag;
+    }
+    SkLanguage& operator=(const SkLanguage& b) {
+        fTag = b.fTag;
+        return *this;
+    }
+
+private:
+    //! BCP 47 language identifier
+    SkString fTag;
+};
+
+enum FontVariants {
+   kDefault_FontVariant = 0x01,
+   kCompact_FontVariant = 0x02,
+   kElegant_FontVariant = 0x04,
+   kLast_FontVariant = kElegant_FontVariant,
+};
+typedef uint32_t FontVariant;
+
+// Must remain trivially movable (can be memmoved).
+struct FontFileInfo {
+    FontFileInfo() : fIndex(0), fWeight(0), fStyle(Style::kAuto) { }
+
+    SkString fFileName;
+    int fIndex;
+    int fWeight;
+    enum class Style { kAuto, kNormal, kItalic } fStyle;
+    SkTArray<SkFontArguments::VariationPosition::Coordinate, true> fVariationDesignPosition;
+};
+
+/**
+ * A font family provides one or more names for a collection of fonts, each of
+ * which has a different style (normal, italic) or weight (thin, light, bold,
+ * etc).
+ * Some fonts may occur in compact variants for use in the user interface.
+ * Android distinguishes "fallback" fonts to support non-ASCII character sets.
+ */
+struct FontFamily {
+    FontFamily(const SkString& basePath, bool isFallbackFont)
+        : fVariant(kDefault_FontVariant)
+        , fOrder(-1)
+        , fIsFallbackFont(isFallbackFont)
+        , fBasePath(basePath)
+    { }
+
+    SkTArray<SkString, true> fNames;
+    SkTArray<FontFileInfo, true> fFonts;
+    SkTArray<SkLanguage, true> fLanguages;
+    SkTHashMap<SkString, std::unique_ptr<FontFamily>> fallbackFamilies;
+    FontVariant fVariant;
+    int fOrder; // internal to the parser, not useful to users.
+    bool fIsFallbackFont;
+    SkString fFallbackFor;
+    const SkString fBasePath;
+};
+
+namespace SkFontMgr_Android_Parser {
+
+/** Parses system font configuration files and appends result to fontFamilies. */
+void GetSystemFontFamilies(SkTDArray<FontFamily*>& fontFamilies);
+
+/** Parses font configuration files and appends result to fontFamilies. */
+void GetCustomFontFamilies(SkTDArray<FontFamily*>& fontFamilies,
+                           const SkString& basePath,
+                           const char* fontsXml,
+                           const char* fallbackFontsXml,
+                           const char* langFallbackFontsDir = nullptr);
+
+}  // namespace SkFontMgr_Android_Parser
+
+
+/** Parses a null terminated string into an integer type, checking for overflow.
+ *  http://www.w3.org/TR/html-markup/datatypes.html#common.data.integer.non-negative-def
+ *
+ *  If the string cannot be parsed into 'value', returns false and does not change 'value'.
+ */
+template <typename T> bool parse_non_negative_integer(const char* s, T* value) {
+    static_assert(std::numeric_limits<T>::is_integer, "T_must_be_integer");
+
+    if (*s == '\0') {
+        return false;
+    }
+
+    const T nMax = std::numeric_limits<T>::max() / 10;
+    const T dMax = std::numeric_limits<T>::max() - (nMax * 10);
+    T n = 0;
+    for (; *s; ++s) {
+        // Check if digit
+        if (*s < '0' || '9' < *s) {
+            return false;
+        }
+        T d = *s - '0';
+        // Check for overflow
+        if (n > nMax || (n == nMax && d > dMax)) {
+            return false;
+        }
+        n = (n * 10) + d;
+    }
+    *value = n;
+    return true;
+}
+
+/** Parses a null terminated string into a signed fixed point value with bias N.
+ *
+ *  Like http://www.w3.org/TR/html-markup/datatypes.html#common.data.float-def ,
+ *  but may start with '.' and does not support 'e'. '-?((:digit:+(.:digit:+)?)|(.:digit:+))'
+ *
+ *  Checks for overflow.
+ *  Low bit rounding is not defined (is currently truncate).
+ *  Bias (N) required to allow for the sign bit and 4 bits of integer.
+ *
+ *  If the string cannot be parsed into 'value', returns false and does not change 'value'.
+ */
+template <int N, typename T> bool parse_fixed(const char* s, T* value) {
+    static_assert(std::numeric_limits<T>::is_integer, "T_must_be_integer");
+    static_assert(std::numeric_limits<T>::is_signed, "T_must_be_signed");
+    static_assert(sizeof(T) * CHAR_BIT - N >= 5, "N_must_leave_four_bits_plus_sign");
+
+    bool negate = false;
+    if (*s == '-') {
+        ++s;
+        negate = true;
+    }
+    if (*s == '\0') {
+        return false;
+    }
+
+    const T nMax = (std::numeric_limits<T>::max() >> N) / 10;
+    const T dMax = (std::numeric_limits<T>::max() >> N) - (nMax * 10);
+    T n = 0;
+    T frac = 0;
+    for (; *s; ++s) {
+        // Check if digit
+        if (*s < '0' || '9' < *s) {
+            // If it wasn't a digit, check if it is a '.' followed by something.
+            if (*s != '.' || s[1] == '\0') {
+                return false;
+            }
+            // Find the end, verify digits.
+            for (++s; *s; ++s) {
+                if (*s < '0' || '9' < *s) {
+                    return false;
+                }
+            }
+            // Read back toward the '.'.
+            for (--s; *s != '.'; --s) {
+                T d = *s - '0';
+                frac = (frac + (d << N)) / 10; // This requires four bits overhead.
+            }
+            break;
+        }
+        T d = *s - '0';
+        // Check for overflow
+        if (n > nMax || (n == nMax && d > dMax)) {
+            return false;
+        }
+        n = (n * 10) + d;
+    }
+    if (negate) {
+        n = -n;
+        frac = -frac;
+    }
+    *value = SkLeftShift(n, N) + frac;
+    return true;
+}
+
+#endif /* SkFontMgr_android_parser_DEFINED */