Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/opentype/OpenTypeUtilities.cpp

-/*
- * Copyright (C) 2008, 2009 Apple Inc.  All rights reserved.
- * Copyright (C) 2009 Torch Mobile, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/platform/graphics/opentype/OpenTypeUtilities.h"
-
-#include "platform/SharedBuffer.h"
-
-namespace WebCore {
-
-struct BigEndianUShort {
-    operator unsigned short() const { return (v & 0x00ff) << 8 | v >> 8; }
-    BigEndianUShort(unsigned short u) : v((u & 0x00ff) << 8 | u >> 8) { }
-    unsigned short v;
-};
-
-struct BigEndianULong {
-    operator unsigned() const { return (v & 0xff) << 24 | (v & 0xff00) << 8 | (v & 0xff0000) >> 8 | v >> 24; }
-    BigEndianULong(unsigned u) : v((u & 0xff) << 24 | (u & 0xff00) << 8 | (u & 0xff0000) >> 8 | u >> 24) { }
-    unsigned v;
-};
-
-#pragma pack(1)
-
-struct TableDirectoryEntry {
-    BigEndianULong tag;
-    BigEndianULong checkSum;
-    BigEndianULong offset;
-    BigEndianULong length;
-};
-
-// Fixed type is not defined on non-CG and Windows platforms. |version| in sfntHeader
-// and headTable and |fontRevision| in headTable are of Fixed, but they're
-// not actually refered to anywhere. Therefore, we just have to match
-// the size (4 bytes). For the definition of Fixed type, see
-// http://developer.apple.com/documentation/mac/Legacy/GXEnvironment/GXEnvironment-356.html#HEADING356-6.
-typedef int32_t Fixed;
-
-struct sfntHeader {
-    Fixed version;
-    BigEndianUShort numTables;
-    BigEndianUShort searchRange;
-    BigEndianUShort entrySelector;
-    BigEndianUShort rangeShift;
-    TableDirectoryEntry tables[1];
-};
-
-struct OS2Table {
-    BigEndianUShort version;
-    BigEndianUShort avgCharWidth;
-    BigEndianUShort weightClass;
-    BigEndianUShort widthClass;
-    BigEndianUShort fsType;
-    BigEndianUShort subscriptXSize;
-    BigEndianUShort subscriptYSize;
-    BigEndianUShort subscriptXOffset;
-    BigEndianUShort subscriptYOffset;
-    BigEndianUShort superscriptXSize;
-    BigEndianUShort superscriptYSize;
-    BigEndianUShort superscriptXOffset;
-    BigEndianUShort superscriptYOffset;
-    BigEndianUShort strikeoutSize;
-    BigEndianUShort strikeoutPosition;
-    BigEndianUShort familyClass;
-    uint8_t panose[10];
-    BigEndianULong unicodeRange[4];
-    uint8_t vendID[4];
-    BigEndianUShort fsSelection;
-    BigEndianUShort firstCharIndex;
-    BigEndianUShort lastCharIndex;
-    BigEndianUShort typoAscender;
-    BigEndianUShort typoDescender;
-    BigEndianUShort typoLineGap;
-    BigEndianUShort winAscent;
-    BigEndianUShort winDescent;
-    BigEndianULong codePageRange[2];
-    BigEndianUShort xHeight;
-    BigEndianUShort capHeight;
-    BigEndianUShort defaultChar;
-    BigEndianUShort breakChar;
-    BigEndianUShort maxContext;
-};
-
-struct headTable {
-    Fixed version;
-    Fixed fontRevision;
-    BigEndianULong checkSumAdjustment;
-    BigEndianULong magicNumber;
-    BigEndianUShort flags;
-    BigEndianUShort unitsPerEm;
-    long long created;
-    long long modified;
-    BigEndianUShort xMin;
-    BigEndianUShort xMax;
-    BigEndianUShort yMin;
-    BigEndianUShort yMax;
-    BigEndianUShort macStyle;
-    BigEndianUShort lowestRectPPEM;
-    BigEndianUShort fontDirectionHint;
-    BigEndianUShort indexToLocFormat;
-    BigEndianUShort glyphDataFormat;
-};
-
-struct nameRecord {
-    BigEndianUShort platformID;
-    BigEndianUShort encodingID;
-    BigEndianUShort languageID;
-    BigEndianUShort nameID;
-    BigEndianUShort length;
-    BigEndianUShort offset;
-};
-
-struct nameTable {
-    BigEndianUShort format;
-    BigEndianUShort count;
-    BigEndianUShort stringOffset;
-    nameRecord nameRecords[1];
-};
-
-#pragma pack()
-
-// adds fontName to the font table in fontData, and writes the new font table to rewrittenFontTable
-// returns the size of the name table (which is used by renameAndActivateFont), or 0 on early abort
-static size_t renameFont(SharedBuffer* fontData, const String& fontName, Vector<char> &rewrittenFontData)
-{
-    size_t originalDataSize = fontData->size();
-    const sfntHeader* sfnt = reinterpret_cast<const sfntHeader*>(fontData->data());
-
-    unsigned t;
-    for (t = 0; t < sfnt->numTables; ++t) {
-        if (sfnt->tables[t].tag == 'name')
-            break;
-    }
-    if (t == sfnt->numTables)
-        return 0;
-
-    const int nameRecordCount = 5;
-
-    // Rounded up to a multiple of 4 to simplify the checksum calculation.
-    size_t nameTableSize = ((offsetof(nameTable, nameRecords) + nameRecordCount * sizeof(nameRecord) + fontName.length() * sizeof(UChar)) & ~3) + 4;
-
-    rewrittenFontData.resize(fontData->size() + nameTableSize);
-    char* data = rewrittenFontData.data();
-    memcpy(data, fontData->data(), originalDataSize);
-
-    // Make the table directory entry point to the new 'name' table.
-    sfntHeader* rewrittenSfnt = reinterpret_cast<sfntHeader*>(data);
-    rewrittenSfnt->tables[t].length = nameTableSize;
-    rewrittenSfnt->tables[t].offset = originalDataSize;
-
-    // Write the new 'name' table after the original font data.
-    nameTable* name = reinterpret_cast<nameTable*>(data + originalDataSize);
-    name->format = 0;
-    name->count = nameRecordCount;
-    name->stringOffset = offsetof(nameTable, nameRecords) + nameRecordCount * sizeof(nameRecord);
-    for (unsigned i = 0; i < nameRecordCount; ++i) {
-        name->nameRecords[i].platformID = 3;
-        name->nameRecords[i].encodingID = 1;
-        name->nameRecords[i].languageID = 0x0409;
-        name->nameRecords[i].offset = 0;
-        name->nameRecords[i].length = fontName.length() * sizeof(UChar);
-    }
-
-    // The required 'name' record types: Family, Style, Unique, Full and PostScript.
-    name->nameRecords[0].nameID = 1;
-    name->nameRecords[1].nameID = 2;
-    name->nameRecords[2].nameID = 3;
-    name->nameRecords[3].nameID = 4;
-    name->nameRecords[4].nameID = 6;
-
-    for (unsigned i = 0; i < fontName.length(); ++i)
-        reinterpret_cast<BigEndianUShort*>(data + originalDataSize + name->stringOffset)[i] = fontName[i];
-
-    // Update the table checksum in the directory entry.
-    rewrittenSfnt->tables[t].checkSum = 0;
-    for (unsigned i = 0; i * sizeof(BigEndianULong) < nameTableSize; ++i)
-        rewrittenSfnt->tables[t].checkSum = rewrittenSfnt->tables[t].checkSum + reinterpret_cast<BigEndianULong*>(name)[i];
-
-    return nameTableSize;
-}
-
-// Rename the font and install the new font data into the system
-HANDLE renameAndActivateFont(SharedBuffer* fontData, const String& fontName)
-{
-    Vector<char> rewrittenFontData;
-    size_t nameTableSize = renameFont(fontData, fontName, rewrittenFontData);
-    if (!nameTableSize)
-        return 0;
-
-    DWORD numFonts = 0;
-    HANDLE fontHandle = AddFontMemResourceEx(rewrittenFontData.data(), fontData->size() + nameTableSize, 0, &numFonts);
-
-    if (fontHandle && numFonts < 1) {
-        RemoveFontMemResourceEx(fontHandle);
-        return 0;
-    }
-
-    return fontHandle;
-}
-
-}