Font variations.

src/ports/SkFontConfigParser_android.cpp

 /*
  * 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 "SkFontMgr_android.h"
 #include "SkStream.h"
 #include "SkTDArray.h"
 #include "SkTSearch.h"
 #include "SkTypeface.h"
 
 #include <expat.h>
 #include <dirent.h>
-#include <stdio.h>
 
-#include <limits>
 #include <stdlib.h>
 
 // From Android version LMP onwards, all font files collapse into
 // /system/etc/fonts.xml. Instead of trying to detect which version
 // we're on, try to open fonts.xml; if that fails, fall back to the
 // older filename.
 #define LMP_SYSTEM_FONTS_FILE "/system/etc/fonts.xml"
 #define OLD_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"
@@ skipping 45 matching lines @@
     SkTDArray<FontFamily*>& fFamilies;        // The array to append families, owned by caller
     SkAutoTDelete<FontFamily> fCurrentFamily; // The family being created, owned by this
     FontFileInfo* fCurrentFontInfo;           // The fontInfo being created, owned by fCurrentFamily
     CurrentTag fCurrentTag;                   // The kind of tag currently being parsed.
     int fVersion;                             // The version of the file parsed.
     const SkString& fBasePath;                // The current base path.
     const bool fIsFallback;                   // Indicates the file being parsed is a fallback file
     const char* fFilename;                    // The name of the file currently being parsed.
 };
 
-/** 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> static bool parse_non_negative_integer(const char* s, T* value) {
-    SK_COMPILE_ASSERT(std::numeric_limits<T>::is_integer, T_must_be_integer);
-    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;
-        }
-        int d = *s - '0';
-        // Check for overflow
-        if (n > nMax || (n == nMax && d > dMax)) {
-            return false;
-        }
-        n = (n * 10) + d;
-    }
-    *value = n;
-    return true;
-}
-
 static bool memeq(const char* s1, const char* s2, size_t n1, size_t n2) {
     return n1 == n2 && 0 == memcmp(s1, s2, n1);
 }
 #define MEMEQ(c, s, n) memeq(c, s, sizeof(c) - 1, n)
 
 #define ATTS_NON_NULL(a, i) (a[i] != NULL && a[i+1] != NULL)
 
 #define SK_FONTCONFIGPARSER_PREFIX "[SkFontConfigParser] "
 
 #define SK_FONTCONFIGPARSER_WARNING(message, ...) SkDebugf( \
@@ skipping 30 matching lines @@
             }
         }
     }
 }
 
 static void XMLCALL font_file_name_handler(void* data, const char* s, int len) {
     FamilyData* self = static_cast<FamilyData*>(data);
     self->fCurrentFontInfo->fFileName.append(s, len);
 }
 
+static void axis_element_handler(FamilyData* self, const char** attributes) {
+    FontFileInfo& file = *self->fCurrentFontInfo;
+    FontFileInfo::Axis& axis = file.fAxes.push_back();
+    for (size_t i = 0; ATTS_NON_NULL(attributes, i); i += 2) {
+        const char* name = attributes[i];
+        const char* value = attributes[i+1];
+        size_t nameLen = strlen(name);
+        if (MEMEQ("tag", name, nameLen)) {
+            size_t valueLen = strlen(value);
+            if (valueLen == 4) {
+                SkFourByteTag tag = SkSetFourByteTag(value[0], value[1], value[2], value[3]);
+                for (int j = 0; j < file.fAxes.count() - 1; ++j) {
+                    if (file.fAxes[j].fTag == tag) {
+                        SK_FONTCONFIGPARSER_WARNING("'%c%c%c%c' axis specified more than once",
+                                                    (tag >> 24) & 0xFF,
+                                                    (tag >> 16) & 0xFF,
+                                                    (tag >>  8) & 0xFF,
+                                                    (tag      ) & 0xFF);
+                    }
+                }
+                axis.fTag = SkSetFourByteTag(value[0], value[1], value[2], value[3]);
+            } else {
+                SK_FONTCONFIGPARSER_WARNING("'%s' is an invalid axis tag", value);
+            }
+        } else if (MEMEQ("stylevalue", name, nameLen)) {
+            if (!parse_fixed<16>(value, &axis.fValue)) {
+                SK_FONTCONFIGPARSER_WARNING("'%s' is an invalid axis stylevalue", value);
+            }
+        }
+    }
+}
+
 static void font_element_handler(FamilyData* self, const char** attributes) {
     // A <font> element should be contained in a <family> element.
     // The element may have 'weight' (non-negative integer), 'style' ("normal", "italic"),
     // and 'index' (non-negative integer) attributes.
     // The element should contain a filename.
     FontFileInfo& file = self->fCurrentFamily->fFonts.push_back();
     self->fCurrentFontInfo = &file;
     for (size_t i = 0; ATTS_NON_NULL(attributes, i); i += 2) {
         const char* name = attributes[i];
         const char* value = attributes[i+1];
@@ skipping 82 matching lines @@
 
 static void XMLCALL start_element_handler(void* data, const char* tag, const char** attributes) {
     FamilyData* self = static_cast<FamilyData*>(data);
     size_t len = strlen(tag);
     if (MEMEQ("family", tag, len)) {
         family_element_handler(self, attributes);
     } else if (MEMEQ("font", tag, len)) {
         font_element_handler(self, attributes);
     } else if (MEMEQ("alias", tag, len)) {
         alias_element_handler(self, attributes);
+    } else if (MEMEQ("axis", tag, len)) {
+        axis_element_handler(self, attributes);
     }
 }
 
 static void XMLCALL end_element_handler(void* data, const char* tag) {
     FamilyData* self = static_cast<FamilyData*>(data);
     size_t len = strlen(tag);
     if (MEMEQ("family", tag, len)) {
         *self->fFamilies.append() = self->fCurrentFamily.detach();
     } else if (MEMEQ("font", tag, len)) {
         XML_SetCharacterDataHandler(self->fParser, NULL);
@@ skipping 377 matching lines @@
     const char* tag = fTag.c_str();
 
     // strip off the rightmost "-.*"
     const char* parentTagEnd = strrchr(tag, '-');
     if (parentTagEnd == NULL) {
         return SkLanguage();
     }
     size_t parentTagLen = parentTagEnd - tag;
     return SkLanguage(tag, parentTagLen);
 }