1 files changed, 276 insertions, 0 deletions
diff --git a/src/ports/SkFontConfigParser_android.cpp b/src/ports/SkFontConfigParser_android.cpp
new file mode 100644
index 0000000000..9214d1bf61
--- /dev/null
+++ b/src/ports/SkFontConfigParser_android.cpp
@@ -0,0 +1,276 @@
+/*
+ * 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.
+ */
+
+#include "SkFontConfigParser_android.h"
+#include "SkTDArray.h"
+#include "SkTypeface.h"
+
+#include <expat.h>
+#include <sys/system_properties.h>
+
+#define SYSTEM_FONTS_FILE "/system/etc/system_fonts.xml"
+#define FALLBACK_FONTS_FILE "/system/etc/fallback_fonts.xml"
+#define VENDOR_FONTS_FILE "/vendor/etc/fallback_fonts.xml"
+
+// These defines are used to determine the kind of tag that we're currently
+// populating with data. We only care about the sibling tags nameset and fileset
+// for now.
+#define NO_TAG 0
+#define NAMESET_TAG 1
+#define FILESET_TAG 2
+
+/**
+ * The FamilyData structure is passed around by the parser so that each handler
+ * can read these variables that are relevant to the current parsing.
+ */
+struct FamilyData {
+    FamilyData(XML_Parser *parserRef, SkTDArray<FontFamily*> &familiesRef) :
+        parser(parserRef),
+        families(familiesRef),
+        currentFamily(NULL),
+        currentFontInfo(NULL),
+        currentTag(NO_TAG) {};
+
+    XML_Parser *parser;                // The expat parser doing the work
+    SkTDArray<FontFamily*> &families;  // The array that each family is put into as it is parsed
+    FontFamily *currentFamily;         // The current family being created
+    FontFileInfo *currentFontInfo;     // The current fontInfo being created
+    int currentTag;                    // A flag to indicate whether we're in nameset/fileset tags
+};
+
+/**
+ * Handler for arbitrary text. This is used to parse the text inside each name
+ * or file tag. The resulting strings are put into the fNames or FontFileInfo arrays.
+ */
+static void textHandler(void *data, const char *s, int len) {
+    FamilyData *familyData = (FamilyData*) data;
+    // Make sure we're in the right state to store this name information
+    if (familyData->currentFamily &&
+            (familyData->currentTag == NAMESET_TAG || familyData->currentTag == FILESET_TAG)) {
+        // Malloc new buffer to store the string
+        char *buff;
+        buff = (char*) malloc((len + 1) * sizeof(char));
+        strncpy(buff, s, len);
+        buff[len] = '\0';
+        switch (familyData->currentTag) {
+        case NAMESET_TAG:
+            *(familyData->currentFamily->fNames.append()) = buff;
+            break;
+        case FILESET_TAG:
+            if (familyData->currentFontInfo) {
+                familyData->currentFontInfo->fFileName = buff;
+            }
+            break;
+        default:
+            // Noop - don't care about any text that's not in the Fonts or Names list
+            break;
+        }
+    }
+}
+
+/**
+ * Handler for font files. This processes the attributes for language and
+ * variants then lets textHandler handle the actual file name
+ */
+static void fontFileElementHandler(FamilyData *familyData, const char **attributes) {
+    FontFileInfo* newFileInfo = new FontFileInfo();
+    if (attributes) {
+        int currentAttributeIndex = 0;
+        while (attributes[currentAttributeIndex]) {
+            const char* attributeName = attributes[currentAttributeIndex];
+            const char* attributeValue = attributes[currentAttributeIndex+1];
+            int nameLength = strlen(attributeName);
+            int valueLength = strlen(attributeValue);
+            if (strncmp(attributeName, "variant", nameLength) == 0) {
+                if (strncmp(attributeValue, "elegant", valueLength) == 0) {
+                    newFileInfo->fPaintOptions.setFontVariant(SkPaintOptionsAndroid::kElegant_Variant);
+                } else if (strncmp(attributeValue, "compact", valueLength) == 0) {
+                    newFileInfo->fPaintOptions.setFontVariant(SkPaintOptionsAndroid::kCompact_Variant);
+                }
+            } else if (strncmp(attributeName, "lang", nameLength) == 0) {
+                newFileInfo->fPaintOptions.setLanguage(attributeValue);
+            }
+            //each element is a pair of attributeName/attributeValue string pairs
+            currentAttributeIndex += 2;
+        }
+    }
+    *(familyData->currentFamily->fFontFiles.append()) = newFileInfo;
+    familyData->currentFontInfo = newFileInfo;
+    XML_SetCharacterDataHandler(*familyData->parser, textHandler);
+}
+
+/**
+ * Handler for the start of a tag. The only tags we expect are family, nameset,
+ * fileset, name, and file.
+ */
+static void startElementHandler(void *data, const char *tag, const char **atts) {
+    FamilyData *familyData = (FamilyData*) data;
+    int len = strlen(tag);
+    if (strncmp(tag, "family", len)== 0) {
+        familyData->currentFamily = new FontFamily();
+        familyData->currentFamily->order = -1;
+        // The Family tag has an optional "order" attribute with an integer value >= 0
+        // If this attribute does not exist, the default value is -1
+        for (int i = 0; atts[i] != NULL; i += 2) {
+            const char* valueString = atts[i+1];
+            int value;
+            int len = sscanf(valueString, "%d", &value);
+            if (len > 0) {
+                familyData->currentFamily->order = value;
+            }
+        }
+    } else if (len == 7 && strncmp(tag, "nameset", len) == 0) {
+        familyData->currentTag = NAMESET_TAG;
+    } else if (len == 7 && strncmp(tag, "fileset", len) == 0) {
+        familyData->currentTag = FILESET_TAG;
+    } else if (strncmp(tag, "name", len) == 0 && familyData->currentTag == NAMESET_TAG) {
+        // If it's a Name, parse the text inside
+        XML_SetCharacterDataHandler(*familyData->parser, textHandler);
+    } else if (strncmp(tag, "file", len) == 0 && familyData->currentTag == FILESET_TAG) {
+        // If it's a file, parse the attributes, then parse the text inside
+        fontFileElementHandler(familyData, atts);
+    }
+}
+
+/**
+ * Handler for the end of tags. We only care about family, nameset, fileset,
+ * name, and file.
+ */
+static void endElementHandler(void *data, const char *tag) {
+    FamilyData *familyData = (FamilyData*) data;
+    int len = strlen(tag);
+    if (strncmp(tag, "family", len)== 0) {
+        // Done parsing a Family - store the created currentFamily in the families array
+        *familyData->families.append() = familyData->currentFamily;
+        familyData->currentFamily = NULL;
+    } else if (len == 7 && strncmp(tag, "nameset", len) == 0) {
+        familyData->currentTag = NO_TAG;
+    } else if (len == 7 && strncmp(tag, "fileset", len) == 0) {
+        familyData->currentTag = NO_TAG;
+    } else if ((strncmp(tag, "name", len) == 0 && familyData->currentTag == NAMESET_TAG) ||
+            (strncmp(tag, "file", len) == 0 && familyData->currentTag == FILESET_TAG)) {
+        // Disable the arbitrary text handler installed to load Name data
+        XML_SetCharacterDataHandler(*familyData->parser, NULL);
+    }
+}
+
+/**
+ * This function parses the given filename and stores the results in the given
+ * families array.
+ */
+static void parseConfigFile(const char *filename, SkTDArray<FontFamily*> &families) {
+    XML_Parser parser = XML_ParserCreate(NULL);
+    FamilyData *familyData = new FamilyData(&parser, families);
+    XML_SetUserData(parser, familyData);
+    XML_SetElementHandler(parser, startElementHandler, endElementHandler);
+    FILE *file = fopen(filename, "r");
+    // Some of the files we attempt to parse (in particular, /vendor/etc/fallback_fonts.xml)
+    // are optional - failure here is okay because one of these optional files may not exist.
+    if (file == NULL) {
+        return;
+    }
+    char buffer[512];
+    bool done = false;
+    while (!done) {
+        fgets(buffer, sizeof(buffer), file);
+        int len = strlen(buffer);
+        if (feof(file) != 0) {
+            done = true;
+        }
+        XML_Parse(parser, buffer, len, done);
+    }
+    fclose(file);
+}
+
+static void getSystemFontFamilies(SkTDArray<FontFamily*> &fontFamilies) {
+    parseConfigFile(SYSTEM_FONTS_FILE, fontFamilies);
+}
+
+static void getFallbackFontFamilies(SkTDArray<FontFamily*> &fallbackFonts) {
+    SkTDArray<FontFamily*> vendorFonts;
+    parseConfigFile(FALLBACK_FONTS_FILE, fallbackFonts);
+    parseConfigFile(VENDOR_FONTS_FILE, vendorFonts);
+
+    // This loop inserts the vendor fallback fonts in the correct order in the
+    // overall fallbacks list.
+    int currentOrder = -1;
+    for (int i = 0; i < vendorFonts.count(); ++i) {
+        FontFamily* family = vendorFonts[i];
+        int order = family->order;
+        if (order < 0) {
+            if (currentOrder < 0) {
+                // Default case - just add it to the end of the fallback list
+                *fallbackFonts.append() = family;
+            } else {
+                // no order specified on this font, but we're incrementing the order
+                // based on an earlier order insertion request
+                *fallbackFonts.insert(currentOrder++) = family;
+            }
+        } else {
+            // Add the font into the fallback list in the specified order. Set
+            // currentOrder for correct placement of other fonts in the vendor list.
+            *fallbackFonts.insert(order) = family;
+            currentOrder = order + 1;
+        }
+    }
+}
+
+/**
+ * Loads data on font families from various expected configuration files. The
+ * resulting data is returned in the given fontFamilies array.
+ */
+void SkFontConfigParser::GetFontFamilies(SkTDArray<FontFamily*> &fontFamilies) {
+
+    getSystemFontFamilies(fontFamilies);
+
+    // Append all the fallback fonts to system fonts
+    SkTDArray<FontFamily*> fallbackFonts;
+    getFallbackFontFamilies(fallbackFonts);
+    for (int i = 0; i < fallbackFonts.count(); ++i) {
+        fallbackFonts[i]->fIsFallbackFont = true;
+        *fontFamilies.append() = fallbackFonts[i];
+    }
+}
+
+void SkFontConfigParser::GetTestFontFamilies(SkTDArray<FontFamily*> &fontFamilies,
+                                             const char* testMainConfigFile,
+                                             const char* testFallbackConfigFile) {
+    parseConfigFile(testMainConfigFile, fontFamilies);
+
+    SkTDArray<FontFamily*> fallbackFonts;
+    parseConfigFile(testFallbackConfigFile, fallbackFonts);
+
+    // Append all fallback fonts to system fonts
+    for (int i = 0; i < fallbackFonts.count(); ++i) {
+        fallbackFonts[i]->fIsFallbackFont = true;
+        *fontFamilies.append() = fallbackFonts[i];
+    }
+}
+
+/**
+ * Read the persistent locale.
+ */
+void SkFontConfigParser::GetLocale(AndroidLocale &locale)
+{
+    char propLang[PROP_VALUE_MAX], propRegn[PROP_VALUE_MAX];
+    __system_property_get("persist.sys.language", propLang);
+    __system_property_get("persist.sys.country", propRegn);
+
+    if (*propLang == 0 && *propRegn == 0) {
+        /* Set to ro properties, default is en_US */
+        __system_property_get("ro.product.locale.language", propLang);
+        __system_property_get("ro.product.locale.region", propRegn);
+        if (*propLang == 0 && *propRegn == 0) {
+            strcpy(propLang, "en");
+            strcpy(propRegn, "US");
+        }
+    }
+    strncpy(locale.language, propLang, 2);
+    locale.language[2] = '\0';
+    strncpy(locale.region, propRegn, 2);
+    locale.region[2] = '\0';
+}