path: root/gfx/skia/patches/archive/0004-Bug-777614-Re-apply-bug-719872-Fix-crash-on-Android-.patch

From 0d730a94e9f6676d5cde45f955fe025a4549817e Mon Sep 17 00:00:00 2001
From: George Wright <gw@gwright.org.uk>
Date: Thu, 23 Aug 2012 16:45:38 -0400
Subject: [PATCH 4/9] Bug 777614 - Re-apply bug 719872 - Fix crash on Android
 by reverting to older FontHost r=nrc

---
 gfx/skia/src/ports/SkFontHost_android_old.cpp | 664 ++++++++++++++++++++++++++
 1 file changed, 664 insertions(+)
 create mode 100644 gfx/skia/src/ports/SkFontHost_android_old.cpp

diff --git a/gfx/skia/src/ports/SkFontHost_android_old.cpp b/gfx/skia/src/ports/SkFontHost_android_old.cpp
new file mode 100644
index 0000000..b5c4f3c
--- /dev/null
+++ b/gfx/skia/src/ports/SkFontHost_android_old.cpp
@@ -0,0 +1,664 @@
+
+/*
+ * Copyright 2006 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 "SkFontHost.h"
+#include "SkDescriptor.h"
+#include "SkMMapStream.h"
+#include "SkPaint.h"
+#include "SkString.h"
+#include "SkStream.h"
+#include "SkThread.h"
+#include "SkTSearch.h"
+#include <stdio.h>
+
+#define FONT_CACHE_MEMORY_BUDGET    (768 * 1024)
+
+#ifndef SK_FONT_FILE_PREFIX
+    #define SK_FONT_FILE_PREFIX          "/fonts/"
+#endif
+
+bool find_name_and_attributes(SkStream* stream, SkString* name, SkTypeface::Style* style,
+                                           bool* isFixedWidth);
+
+static void GetFullPathForSysFonts(SkString* full, const char name[]) {
+    full->set(getenv("ANDROID_ROOT"));
+    full->append(SK_FONT_FILE_PREFIX);
+    full->append(name);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+struct FamilyRec;
+
+/*  This guy holds a mapping of a name -> family, used for looking up fonts.
+    Since it is stored in a stretchy array that doesn't preserve object
+    semantics, we don't use constructor/destructors, but just have explicit
+    helpers to manage our internal bookkeeping.
+*/
+struct NameFamilyPair {
+    const char* fName;      // we own this
+    FamilyRec*  fFamily;    // we don't own this, we just reference it
+
+    void construct(const char name[], FamilyRec* family) {
+        fName = strdup(name);
+        fFamily = family;   // we don't own this, so just record the referene
+    }
+
+    void destruct() {
+        free((char*)fName);
+        // we don't own family, so just ignore our reference
+    }
+};
+
+// we use atomic_inc to grow this for each typeface we create
+static int32_t gUniqueFontID;
+
+// this is the mutex that protects these globals
+static SkMutex gFamilyMutex;
+static FamilyRec* gFamilyHead;
+static SkTDArray<NameFamilyPair> gNameList;
+
+struct FamilyRec {
+    FamilyRec*  fNext;
+    SkTypeface* fFaces[4];
+
+    FamilyRec()
+    {
+        fNext = gFamilyHead;
+        memset(fFaces, 0, sizeof(fFaces));
+        gFamilyHead = this;
+    }
+};
+
+static SkTypeface* find_best_face(const FamilyRec* family,
+                                  SkTypeface::Style style) {
+    SkTypeface* const* faces = family->fFaces;
+
+    if (faces[style] != NULL) { // exact match
+        return faces[style];
+    }
+    // look for a matching bold
+    style = (SkTypeface::Style)(style ^ SkTypeface::kItalic);
+    if (faces[style] != NULL) {
+        return faces[style];
+    }
+    // look for the plain
+    if (faces[SkTypeface::kNormal] != NULL) {
+        return faces[SkTypeface::kNormal];
+    }
+    // look for anything
+    for (int i = 0; i < 4; i++) {
+        if (faces[i] != NULL) {
+            return faces[i];
+        }
+    }
+    // should never get here, since the faces list should not be empty
+    SkASSERT(!"faces list is empty");
+    return NULL;
+}
+
+static FamilyRec* find_family(const SkTypeface* member) {
+    FamilyRec* curr = gFamilyHead;
+    while (curr != NULL) {
+        for (int i = 0; i < 4; i++) {
+            if (curr->fFaces[i] == member) {
+                return curr;
+            }
+        }
+        curr = curr->fNext;
+    }
+    return NULL;
+}
+
+/*  Returns the matching typeface, or NULL. If a typeface is found, its refcnt
+    is not modified.
+ */
+static SkTypeface* find_from_uniqueID(uint32_t uniqueID) {
+    FamilyRec* curr = gFamilyHead;
+    while (curr != NULL) {
+        for (int i = 0; i < 4; i++) {
+            SkTypeface* face = curr->fFaces[i];
+            if (face != NULL && face->uniqueID() == uniqueID) {
+                return face;
+            }
+        }
+        curr = curr->fNext;
+    }
+    return NULL;
+}
+
+/*  Remove reference to this face from its family. If the resulting family
+    is empty (has no faces), return that family, otherwise return NULL
+*/
+static FamilyRec* remove_from_family(const SkTypeface* face) {
+    FamilyRec* family = find_family(face);
+    SkASSERT(family->fFaces[face->style()] == face);
+    family->fFaces[face->style()] = NULL;
+
+    for (int i = 0; i < 4; i++) {
+        if (family->fFaces[i] != NULL) {    // family is non-empty
+            return NULL;
+        }
+    }
+    return family;  // return the empty family
+}
+
+// maybe we should make FamilyRec be doubly-linked
+static void detach_and_delete_family(FamilyRec* family) {
+    FamilyRec* curr = gFamilyHead;
+    FamilyRec* prev = NULL;
+
+    while (curr != NULL) {
+        FamilyRec* next = curr->fNext;
+        if (curr == family) {
+            if (prev == NULL) {
+                gFamilyHead = next;
+            } else {
+                prev->fNext = next;
+            }
+            SkDELETE(family);
+            return;
+        }
+        prev = curr;
+        curr = next;
+    }
+    SkASSERT(!"Yikes, couldn't find family in our list to remove/delete");
+}
+
+static SkTypeface* find_typeface(const char name[], SkTypeface::Style style) {
+    NameFamilyPair* list = gNameList.begin();
+    int             count = gNameList.count();
+
+    int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
+
+    if (index >= 0) {
+        return find_best_face(list[index].fFamily, style);
+    }
+    return NULL;
+}
+
+static SkTypeface* find_typeface(const SkTypeface* familyMember,
+                                 SkTypeface::Style style) {
+    const FamilyRec* family = find_family(familyMember);
+    return family ? find_best_face(family, style) : NULL;
+}
+
+static void add_name(const char name[], FamilyRec* family) {
+    SkAutoAsciiToLC tolc(name);
+    name = tolc.lc();
+
+    NameFamilyPair* list = gNameList.begin();
+    int             count = gNameList.count();
+
+    int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
+
+    if (index < 0) {
+        list = gNameList.insert(~index);
+        list->construct(name, family);
+    }
+}
+
+static void remove_from_names(FamilyRec* emptyFamily)
+{
+#ifdef SK_DEBUG
+    for (int i = 0; i < 4; i++) {
+        SkASSERT(emptyFamily->fFaces[i] == NULL);
+    }
+#endif
+
+    SkTDArray<NameFamilyPair>& list = gNameList;
+
+    // must go backwards when removing
+    for (int i = list.count() - 1; i >= 0; --i) {
+        NameFamilyPair* pair = &list[i];
+        if (pair->fFamily == emptyFamily) {
+            pair->destruct();
+            list.remove(i);
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class FamilyTypeface : public SkTypeface {
+public:
+    FamilyTypeface(Style style, bool sysFont, SkTypeface* familyMember,
+                   bool isFixedWidth)
+    : SkTypeface(style, sk_atomic_inc(&gUniqueFontID) + 1, isFixedWidth) {
+        fIsSysFont = sysFont;
+
+        SkAutoMutexAcquire  ac(gFamilyMutex);
+
+        FamilyRec* rec = NULL;
+        if (familyMember) {
+            rec = find_family(familyMember);
+            SkASSERT(rec);
+        } else {
+            rec = SkNEW(FamilyRec);
+        }
+        rec->fFaces[style] = this;
+    }
+
+    virtual ~FamilyTypeface() {
+        SkAutoMutexAcquire  ac(gFamilyMutex);
+
+        // remove us from our family. If the family is now empty, we return
+        // that and then remove that family from the name list
+        FamilyRec* family = remove_from_family(this);
+        if (NULL != family) {
+            remove_from_names(family);
+            detach_and_delete_family(family);
+        }
+    }
+
+    bool isSysFont() const { return fIsSysFont; }
+
+    virtual SkStream* openStream() = 0;
+    virtual const char* getUniqueString() const = 0;
+    virtual const char* getFilePath() const = 0;
+
+private:
+    bool    fIsSysFont;
+
+    typedef SkTypeface INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+class StreamTypeface : public FamilyTypeface {
+public:
+    StreamTypeface(Style style, bool sysFont, SkTypeface* familyMember,
+                   SkStream* stream, bool isFixedWidth)
+    : INHERITED(style, sysFont, familyMember, isFixedWidth) {
+        SkASSERT(stream);
+        stream->ref();
+        fStream = stream;
+    }
+    virtual ~StreamTypeface() {
+        fStream->unref();
+    }
+
+    // overrides
+    virtual SkStream* openStream() {
+        // we just ref our existing stream, since the caller will call unref()
+        // when they are through
+        fStream->ref();
+        // must rewind each time, since the caller assumes a "new" stream
+        fStream->rewind();
+        return fStream;
+    }
+    virtual const char* getUniqueString() const { return NULL; }
+    virtual const char* getFilePath() const { return NULL; }
+
+private:
+    SkStream* fStream;
+
+    typedef FamilyTypeface INHERITED;
+};
+
+class FileTypeface : public FamilyTypeface {
+public:
+    FileTypeface(Style style, bool sysFont, SkTypeface* familyMember,
+                 const char path[], bool isFixedWidth)
+    : INHERITED(style, sysFont, familyMember, isFixedWidth) {
+        SkString fullpath;
+
+        if (sysFont) {
+            GetFullPathForSysFonts(&fullpath, path);
+            path = fullpath.c_str();
+        }
+        fPath.set(path);
+    }
+
+    // overrides
+    virtual SkStream* openStream() {
+        SkStream* stream = SkNEW_ARGS(SkMMAPStream, (fPath.c_str()));
+
+        // check for failure
+        if (stream->getLength() <= 0) {
+            SkDELETE(stream);
+            // maybe MMAP isn't supported. try FILE
+            stream = SkNEW_ARGS(SkFILEStream, (fPath.c_str()));
+            if (stream->getLength() <= 0) {
+                SkDELETE(stream);
+                stream = NULL;
+            }
+        }
+        return stream;
+    }
+    virtual const char* getUniqueString() const {
+        const char* str = strrchr(fPath.c_str(), '/');
+        if (str) {
+            str += 1;   // skip the '/'
+        }
+        return str;
+    }
+    virtual const char* getFilePath() const {
+        return fPath.c_str();
+    }
+
+private:
+    SkString fPath;
+
+    typedef FamilyTypeface INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+static bool get_name_and_style(const char path[], SkString* name,
+                               SkTypeface::Style* style,
+                               bool* isFixedWidth, bool isExpected) {
+    SkString        fullpath;
+    GetFullPathForSysFonts(&fullpath, path);
+
+    SkMMAPStream stream(fullpath.c_str());
+    if (stream.getLength() > 0) {
+        find_name_and_attributes(&stream, name, style, isFixedWidth);
+        return true;
+    }
+    else {
+        SkFILEStream stream(fullpath.c_str());
+        if (stream.getLength() > 0) {
+            find_name_and_attributes(&stream, name, style, isFixedWidth);
+            return true;
+        }
+    }
+
+    if (isExpected) {
+        SkDebugf("---- failed to open <%s> as a font\n", fullpath.c_str());
+    }
+    return false;
+}
+
+// used to record our notion of the pre-existing fonts
+struct FontInitRec {
+    const char*         fFileName;
+    const char* const*  fNames;     // null-terminated list
+};
+
+static const char* gSansNames[] = {
+    "sans-serif", "arial", "helvetica", "tahoma", "verdana", NULL
+};
+
+static const char* gSerifNames[] = {
+    "serif", "times", "times new roman", "palatino", "georgia", "baskerville",
+    "goudy", "fantasy", "cursive", "ITC Stone Serif", NULL
+};
+
+static const char* gMonoNames[] = {
+    "monospace", "courier", "courier new", "monaco", NULL
+};
+
+// deliberately empty, but we use the address to identify fallback fonts
+static const char* gFBNames[] = { NULL };
+
+/*  Fonts must be grouped by family, with the first font in a family having the
+    list of names (even if that list is empty), and the following members having
+    null for the list. The names list must be NULL-terminated
+*/
+static const FontInitRec gSystemFonts[] = {
+    { "DroidSans.ttf",              gSansNames  },
+    { "DroidSans-Bold.ttf",         NULL        },
+    { "DroidSerif-Regular.ttf",     gSerifNames },
+    { "DroidSerif-Bold.ttf",        NULL        },
+    { "DroidSerif-Italic.ttf",      NULL        },
+    { "DroidSerif-BoldItalic.ttf",  NULL        },
+    { "DroidSansMono.ttf",          gMonoNames  },
+    /*  These are optional, and can be ignored if not found in the file system.
+        These are appended to gFallbackFonts[] as they are seen, so we list
+        them in the order we want them to be accessed by NextLogicalFont().
+     */
+    { "DroidSansArabic.ttf",        gFBNames    },
+    { "DroidSansHebrew.ttf",        gFBNames    },
+    { "DroidSansThai.ttf",          gFBNames    },
+    { "MTLmr3m.ttf",                gFBNames    }, // Motoya Japanese Font
+    { "MTLc3m.ttf",                 gFBNames    }, // Motoya Japanese Font
+    { "DroidSansJapanese.ttf",      gFBNames    },
+    { "DroidSansFallback.ttf",      gFBNames    }
+};
+
+#define DEFAULT_NAMES   gSansNames
+
+// these globals are assigned (once) by load_system_fonts()
+static FamilyRec* gDefaultFamily;
+static SkTypeface* gDefaultNormal;
+
+/*  This is sized conservatively, assuming that it will never be a size issue.
+    It will be initialized in load_system_fonts(), and will be filled with the
+    fontIDs that can be used for fallback consideration, in sorted order (sorted
+    meaning element[0] should be used first, then element[1], etc. When we hit
+    a fontID==0 in the array, the list is done, hence our allocation size is
+    +1 the total number of possible system fonts. Also see NextLogicalFont().
+ */
+static uint32_t gFallbackFonts[SK_ARRAY_COUNT(gSystemFonts)+1];
+
+/*  Called once (ensured by the sentinel check at the beginning of our body).
+    Initializes all the globals, and register the system fonts.
+ */
+static void load_system_fonts() {
+    // check if we've already be called
+    if (NULL != gDefaultNormal) {
+        return;
+    }
+
+    const FontInitRec* rec = gSystemFonts;
+    SkTypeface* firstInFamily = NULL;
+    int fallbackCount = 0;
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gSystemFonts); i++) {
+        // if we're the first in a new family, clear firstInFamily
+        if (rec[i].fNames != NULL) {
+            firstInFamily = NULL;
+        }
+
+        bool isFixedWidth;
+        SkString name;
+        SkTypeface::Style style;
+
+        // we expect all the fonts, except the "fallback" fonts
+        bool isExpected = (rec[i].fNames != gFBNames);
+        if (!get_name_and_style(rec[i].fFileName, &name, &style,
+                                &isFixedWidth, isExpected)) {
+            continue;
+        }
+
+        SkTypeface* tf = SkNEW_ARGS(FileTypeface,
+                                    (style,
+                                     true,  // system-font (cannot delete)
+                                     firstInFamily, // what family to join
+                                     rec[i].fFileName,
+                                     isFixedWidth) // filename
+                                    );
+
+        if (rec[i].fNames != NULL) {
+            // see if this is one of our fallback fonts
+            if (rec[i].fNames == gFBNames) {
+            //    SkDebugf("---- adding %s as fallback[%d] fontID %d\n",
+            //             rec[i].fFileName, fallbackCount, tf->uniqueID());
+                gFallbackFonts[fallbackCount++] = tf->uniqueID();
+            }
+
+            firstInFamily = tf;
+            FamilyRec* family = find_family(tf);
+            const char* const* names = rec[i].fNames;
+
+            // record the default family if this is it
+            if (names == DEFAULT_NAMES) {
+                gDefaultFamily = family;
+            }
+            // add the names to map to this family
+            while (*names) {
+                add_name(*names, family);
+                names += 1;
+            }
+        }
+    }
+
+    // do this after all fonts are loaded. This is our default font, and it
+    // acts as a sentinel so we only execute load_system_fonts() once
+    gDefaultNormal = find_best_face(gDefaultFamily, SkTypeface::kNormal);
+    // now terminate our fallback list with the sentinel value
+    gFallbackFonts[fallbackCount] = 0;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
+    const char* name = ((FamilyTypeface*)face)->getUniqueString();
+
+    stream->write8((uint8_t)face->style());
+
+    if (NULL == name || 0 == *name) {
+        stream->writePackedUInt(0);
+//        SkDebugf("--- fonthost serialize null\n");
+    } else {
+        uint32_t len = strlen(name);
+        stream->writePackedUInt(len);
+        stream->write(name, len);
+//      SkDebugf("--- fonthost serialize <%s> %d\n", name, face->style());
+    }
+}
+
+SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
+    load_system_fonts();
+
+    int style = stream->readU8();
+
+    int len = stream->readPackedUInt();
+    if (len > 0) {
+        SkString str;
+        str.resize(len);
+        stream->read(str.writable_str(), len);
+
+        const FontInitRec* rec = gSystemFonts;
+        for (size_t i = 0; i < SK_ARRAY_COUNT(gSystemFonts); i++) {
+            if (strcmp(rec[i].fFileName, str.c_str()) == 0) {
+                // backup until we hit the fNames
+                for (int j = i; j >= 0; --j) {
+                    if (rec[j].fNames != NULL) {
+                        return SkFontHost::CreateTypeface(NULL,
+                                    rec[j].fNames[0], (SkTypeface::Style)style);
+                    }
+                }
+            }
+        }
+    }
+    return NULL;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
+                                       const char familyName[],
+                                       SkTypeface::Style style) {
+    load_system_fonts();
+
+    SkAutoMutexAcquire  ac(gFamilyMutex);
+
+    // clip to legal style bits
+    style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
+
+    SkTypeface* tf = NULL;
+
+    if (NULL != familyFace) {
+        tf = find_typeface(familyFace, style);
+    } else if (NULL != familyName) {
+//        SkDebugf("======= familyName <%s>\n", familyName);
+        tf = find_typeface(familyName, style);
+    }
+
+    if (NULL == tf) {
+        tf = find_best_face(gDefaultFamily, style);
+    }
+
+    // we ref(), since the symantic is to return a new instance
+    tf->ref();
+    return tf;
+}
+
+SkStream* SkFontHost::OpenStream(uint32_t fontID) {
+    SkAutoMutexAcquire  ac(gFamilyMutex);
+
+    FamilyTypeface* tf = (FamilyTypeface*)find_from_uniqueID(fontID);
+    SkStream* stream = tf ? tf->openStream() : NULL;
+
+    if (stream && stream->getLength() == 0) {
+        stream->unref();
+        stream = NULL;
+    }
+    return stream;
+}
+
+size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
+                               int32_t* index) {
+    SkAutoMutexAcquire  ac(gFamilyMutex);
+
+    FamilyTypeface* tf = (FamilyTypeface*)find_from_uniqueID(fontID);
+    const char* src = tf ? tf->getFilePath() : NULL;
+
+    if (src) {
+        size_t size = strlen(src);
+        if (path) {
+            memcpy(path, src, SkMin32(size, length));
+        }
+        if (index) {
+            *index = 0; // we don't have collections (yet)
+        }
+        return size;
+    } else {
+        return 0;
+    }
+}
+
+SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
+    load_system_fonts();
+
+    /*  First see if fontID is already one of our fallbacks. If so, return
+        its successor. If fontID is not in our list, then return the first one
+        in our list. Note: list is zero-terminated, and returning zero means
+        we have no more fonts to use for fallbacks.
+     */
+    const uint32_t* list = gFallbackFonts;
+    for (int i = 0; list[i] != 0; i++) {
+        if (list[i] == currFontID) {
+            return list[i+1];
+        }
+    }
+    return list[0];
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
+    if (NULL == stream || stream->getLength() <= 0) {
+        return NULL;
+    }
+
+    bool isFixedWidth;
+    SkString name;
+    SkTypeface::Style style;
+    find_name_and_attributes(stream, &name, &style, &isFixedWidth);
+
+    if (!name.isEmpty()) {
+        return SkNEW_ARGS(StreamTypeface, (style, false, NULL, stream, isFixedWidth));
+    } else {
+        return NULL;
+    }
+}
+
+SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
+    SkStream* stream = SkNEW_ARGS(SkMMAPStream, (path));
+    SkTypeface* face = SkFontHost::CreateTypefaceFromStream(stream);
+    // since we created the stream, we let go of our ref() here
+    stream->unref();
+    return face;
+}
+
+///////////////////////////////////////////////////////////////////////////////
-- 
1.7.11.4