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[PDF] Fix font embedding restrictions.

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Stop using restricted font outlines and honor don't subset restriction.

R=reed@google.com, bungeman@google.com

Author: vandebo@chromium.org

Review URL: https://codereview.chromium.org/107863002

git-svn-id: http://skia.googlecode.com/svn/trunk@12600 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2013-12-10 16:32:06 +00:00
parent e167b11fb5
commit 47fb2b9c67
11 changed files with 203 additions and 65 deletions
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1
gyp/core.gyp
View File

@ -23,6 +23,7 @@
'../include/xml',
'../src/core',
'../src/opts',
'../src/sfnt',
'../src/image',
],
'sources': [

16
include/core/SkAdvancedTypefaceMetrics.h
View File

@ -35,15 +35,21 @@ public:
kCFF_Font,
kTrueType_Font,
kOther_Font,
kNotEmbeddable_Font
};
// The type of the underlying font program. This field determines which
// of the following fields are valid. If it is kOther_Font or
// kNotEmbeddable_Font, the per glyph information will never be populated.
// of the following fields are valid. If it is kOther_Font the per glyph
// information will never be populated.
FontType fType;
// fMultiMaster may be true for Type1_Font or CFF_Font.
bool fMultiMaster;
enum FontFlags {
kEmpty_FontFlag = 0x0, //!<No flags set
kMultiMaster_FontFlag = 0x1, //!<May be true for Type1 or CFF fonts.
kNotEmbeddable_FontFlag = 0x2, //!<May not be embedded.
kNotSubsettable_FontFlag = 0x4, //!<May not be subset.
};
// Global font flags.
FontFlags fFlags;
uint16_t fLastGlyphID; // The last valid glyph ID in the font.
uint16_t fEmSize; // The size of the em box (defines font units).

10
include/pdf/SkPDFDocument.h
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@ -69,9 +69,17 @@ public:
SK_API bool appendPage(SkPDFDevice* pdfDevice);
/** Get the count of unique font types used in the document.
* DEPRECATED.
*/
SK_API void getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1]) const;
int counts[SkAdvancedTypefaceMetrics::kOther_Font + 2]) const;
/** Get the count of unique font types used in the document.
*/
SK_API void getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kOther_Font + 1],
int* notSubsettableCount,
int* notEmbedddableCount) const;
private:
SkAutoTDelete<SkPDFCatalog> fCatalog;

23
src/core/SkTypeface.cpp
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@ -6,8 +6,10 @@
*/
#include "SkAdvancedTypefaceMetrics.h"
#include "SkEndian.h"
#include "SkFontDescriptor.h"
#include "SkFontHost.h"
#include "SkOTTable_OS_2.h"
#include "SkStream.h"
#include "SkTypeface.h"
@ -259,7 +261,26 @@ SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics::PerGlyphInfo info,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
return this->onGetAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
SkAdvancedTypefaceMetrics* result =
this->onGetAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
if (result && result->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) {
struct SkOTTableOS2 os2table;
if (this->getTableData(SkEndian_SwapBE32(SkOTTableOS2::TAG), 0,
sizeof(os2table), &os2table) > 0) {
if (os2table.version.v2.fsType.field.Restricted ||
os2table.version.v2.fsType.field.Bitmap) {
result->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
result->fFlags,
SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag);
}
if (os2table.version.v2.fsType.field.NoSubsetting) {
result->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
result->fFlags,
SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag);
}
}
}
return result;
}
///////////////////////////////////////////////////////////////////////////////

46
src/pdf/SkPDFDocument.cpp
View File

@ -258,11 +258,13 @@ bool SkPDFDocument::appendPage(SkPDFDevice* pdfDevice) {
return true;
}
// Deprecated.
void SkPDFDocument::getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1]) const {
int counts[SkAdvancedTypefaceMetrics::kOther_Font + 2]) const {
sk_bzero(counts, sizeof(int) *
(SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1));
(SkAdvancedTypefaceMetrics::kOther_Font + 2));
SkTDArray<SkFontID> seenFonts;
int notEmbeddable = 0;
for (int pageNumber = 0; pageNumber < fPages.count(); pageNumber++) {
const SkTDArray<SkPDFFont*>& fontResources =
@ -272,9 +274,49 @@ void SkPDFDocument::getCountOfFontTypes(
if (seenFonts.find(fontID) == -1) {
counts[fontResources[font]->getType()]++;
seenFonts.push(fontID);
if (!fontResources[font]->canEmbed()) {
notEmbeddable++;
}
}
}
}
counts[SkAdvancedTypefaceMetrics::kOther_Font + 1] = notEmbeddable;
}
void SkPDFDocument::getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kOther_Font + 1],
int* notSubsettableCount,
int* notEmbeddableCount) const {
sk_bzero(counts, sizeof(int) *
(SkAdvancedTypefaceMetrics::kOther_Font + 1));
SkTDArray<SkFontID> seenFonts;
int notSubsettable = 0;
int notEmbeddable = 0;
for (int pageNumber = 0; pageNumber < fPages.count(); pageNumber++) {
const SkTDArray<SkPDFFont*>& fontResources =
fPages[pageNumber]->getFontResources();
for (int font = 0; font < fontResources.count(); font++) {
SkFontID fontID = fontResources[font]->typeface()->uniqueID();
if (seenFonts.find(fontID) == -1) {
counts[fontResources[font]->getType()]++;
seenFonts.push(fontID);
if (!fontResources[font]->canSubset()) {
notSubsettable++;
}
if (!fontResources[font]->canEmbed()) {
notEmbeddable++;
}
}
}
}
if (notSubsettableCount) {
*notSubsettableCount = notSubsettable;
}
if (notEmbeddableCount) {
*notEmbeddableCount = notEmbeddable;
}
}
void SkPDFDocument::emitHeader(SkWStream* stream) {

85
src/pdf/SkPDFFont.cpp
View File

@ -749,6 +749,24 @@ SkAdvancedTypefaceMetrics::FontType SkPDFFont::getType() {
return fFontType;
}
bool SkPDFFont::canEmbed() const {
if (!fFontInfo.get()) {
SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font);
return true;
}
return (fFontInfo->fFlags &
SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag) == 0;
}
bool SkPDFFont::canSubset() const {
if (!fFontInfo.get()) {
SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font);
return true;
}
return (fFontInfo->fFlags &
SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag) == 0;
}
bool SkPDFFont::hasGlyph(uint16_t id) {
return (id >= fFirstGlyphID && id <= fLastGlyphID) || id == 0;
}
@ -797,7 +815,7 @@ SkPDFFont* SkPDFFont::GetFontResource(SkTypeface* typeface, uint16_t glyphID) {
// This only is to catch callers who pass invalid glyph ids.
// If glyph id is invalid, then we will create duplicate entries
// for True Type fonts.
// for TrueType fonts.
SkAdvancedTypefaceMetrics::FontType fontType =
fontMetrics.get() ? fontMetrics.get()->fType :
SkAdvancedTypefaceMetrics::kOther_Font;
@ -877,9 +895,8 @@ SkPDFFont::SkPDFFont(SkAdvancedTypefaceMetrics* info, SkTypeface* typeface,
fLastGlyphID(info ? info->fLastGlyphID : 0),
fFontInfo(SkSafeRef(info)),
fDescriptor(SkSafeRef(relatedFontDescriptor)) {
if (info == NULL) {
fFontType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
} else if (info->fMultiMaster) {
if (info == NULL ||
info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag) {
fFontType = SkAdvancedTypefaceMetrics::kOther_Font;
} else {
fFontType = info->fType;
@ -891,9 +908,10 @@ SkPDFFont* SkPDFFont::Create(SkAdvancedTypefaceMetrics* info,
SkTypeface* typeface, uint16_t glyphID,
SkPDFDict* relatedFontDescriptor) {
SkAdvancedTypefaceMetrics::FontType type =
info ? info->fType : SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
info ? info->fType : SkAdvancedTypefaceMetrics::kOther_Font;
if (info && info->fMultiMaster) {
if (info &&
(info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag)) {
NOT_IMPLEMENTED(true, true);
return new SkPDFType3Font(info,
typeface,
@ -912,8 +930,7 @@ SkPDFFont* SkPDFFont::Create(SkAdvancedTypefaceMetrics* info,
}
SkASSERT(type == SkAdvancedTypefaceMetrics::kCFF_Font ||
type == SkAdvancedTypefaceMetrics::kOther_Font ||
type == SkAdvancedTypefaceMetrics::kNotEmbeddable_Font);
type == SkAdvancedTypefaceMetrics::kOther_Font);
return new SkPDFType3Font(info, typeface, glyphID);
}
@ -1040,11 +1057,17 @@ SkPDFType0Font::SkPDFType0Font(SkAdvancedTypefaceMetrics* info,
SkTypeface* typeface)
: SkPDFFont(info, typeface, NULL) {
SkDEBUGCODE(fPopulated = false);
if (!canSubset()) {
populate(NULL);
}
}
SkPDFType0Font::~SkPDFType0Font() {}
SkPDFFont* SkPDFType0Font::getFontSubset(const SkPDFGlyphSet* subset) {
if (!canSubset()) {
return NULL;
}
SkPDFType0Font* newSubset = new SkPDFType0Font(fontInfo(), typeface());
newSubset->populate(subset);
return newSubset;
@ -1093,19 +1116,34 @@ bool SkPDFCIDFont::addFontDescriptor(int16_t defaultWidth,
SkAutoTUnref<SkPDFDict> descriptor(new SkPDFDict("FontDescriptor"));
setFontDescriptor(descriptor.get());
addResource(descriptor.get());
insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
if (!addCommonFontDescriptorEntries(defaultWidth)) {
return false;
}
if (!canEmbed()) {
return true;
}
switch (getType()) {
case SkAdvancedTypefaceMetrics::kTrueType_Font: {
SkASSERT(subset);
// Font subsetting
SkPDFStream* rawStream = NULL;
int fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(),
SkAutoTUnref<SkPDFStream> fontStream;
int fontSize = 0;
if (canSubset()) {
SkPDFStream* rawStream = NULL;
fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(),
typeface(),
*subset,
&rawStream);
fontStream.reset(rawStream);
} else {
int ttcIndex;
SkAutoTUnref<SkStream> fontData(
typeface()->openStream(&ttcIndex));
fontStream.reset(new SkPDFStream(fontData.get()));
fontSize = fontData->getLength();
}
SkASSERT(fontSize);
SkASSERT(rawStream);
SkAutoTUnref<SkPDFStream> fontStream(rawStream);
SkASSERT(fontStream.get());
addResource(fontStream.get());
fontStream->insertInt("Length1", fontSize);
@ -1133,9 +1171,7 @@ bool SkPDFCIDFont::addFontDescriptor(int16_t defaultWidth,
default:
SkASSERT(false);
}
insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
return addCommonFontDescriptorEntries(defaultWidth);
return true;
}
bool SkPDFCIDFont::populate(const SkPDFGlyphSet* subset) {
@ -1251,12 +1287,15 @@ bool SkPDFType1Font::addFontDescriptor(int16_t defaultWidth) {
if (fontData == NULL) {
return false;
}
SkAutoTUnref<SkPDFStream> fontStream(new SkPDFStream(fontData));
addResource(fontStream.get());
fontStream->insertInt("Length1", header);
fontStream->insertInt("Length2", data);
fontStream->insertInt("Length3", trailer);
descriptor->insert("FontFile", new SkPDFObjRef(fontStream.get()))->unref();
if (canEmbed()) {
SkAutoTUnref<SkPDFStream> fontStream(new SkPDFStream(fontData));
addResource(fontStream.get());
fontStream->insertInt("Length1", header);
fontStream->insertInt("Length2", data);
fontStream->insertInt("Length3", trailer);
descriptor->insert("FontFile",
new SkPDFObjRef(fontStream.get()))->unref();
}
addResource(descriptor.get());
insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();

13
src/pdf/SkPDFFont.h
View File

@ -99,6 +99,14 @@ public:
*/
virtual bool multiByteGlyphs() const = 0;
/** Returns true if the machine readable licensing bits allow embedding.
*/
bool canEmbed() const;
/** Returns true if the machine readable licensing bits allow subsetting.
*/
bool canSubset() const;
/** Return true if this font has an encoding for the passed glyph id.
*/
bool hasGlyph(uint16_t glyphID);
@ -121,8 +129,7 @@ public:
* @param typeface The typeface to find.
* @param glyphID Specify which section of a large font is of interest.
*/
static SkPDFFont* GetFontResource(SkTypeface* typeface,
uint16_t glyphID);
static SkPDFFont* GetFontResource(SkTypeface* typeface, uint16_t glyphID);
/** Subset the font based on usage set. Returns a SkPDFFont instance with
* subset.
@ -188,8 +195,6 @@ private:
// this will be a subset if the font has more than 255 glyphs.
uint16_t fFirstGlyphID;
uint16_t fLastGlyphID;
// The font info is only kept around after construction for large
// Type1 (non CID) fonts that need multiple "fonts" to access all glyphs.
SkAutoTUnref<SkAdvancedTypefaceMetrics> fFontInfo;
SkTDArray<SkPDFObject*> fResources;
SkAutoTUnref<SkPDFDict> fDescriptor;

36
src/ports/SkFontHost_FreeType.cpp
View File

@ -411,6 +411,20 @@ static bool canEmbed(FT_Face face) {
#endif
}
static bool canSubset(FT_Face face) {
#ifdef FT_FSTYPE_NO_SUBSETTING
FT_UShort fsType = FT_Get_FSType_Flags(face);
return (fsType & FT_FSTYPE_NO_SUBSETTING) == 0;
#else
// No subset is 0x100.
TT_OS2* os2_table;
if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) {
return (os2_table->fsType & 0x100) == 0;
}
return false; // We tried, fail safe.
#endif
}
static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) {
const FT_UInt glyph_id = FT_Get_Char_Index(face, letter);
if (!glyph_id)
@ -495,7 +509,21 @@ SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics;
info->fFontName.set(FT_Get_Postscript_Name(face));
info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face);
info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag;
if (FT_HAS_MULTIPLE_MASTERS(face)) {
info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
info->fFlags, SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag);
}
if (!canEmbed(face)) {
info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
info->fFlags,
SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag);
}
if (!canSubset(face)) {
info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
info->fFlags,
SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag);
}
info->fLastGlyphID = face->num_glyphs - 1;
info->fEmSize = 1000;
@ -588,8 +616,7 @@ SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics(
info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax,
face->bbox.xMax, face->bbox.yMin);
if (!canEmbed(face) || !FT_IS_SCALABLE(face) ||
info->fType == SkAdvancedTypefaceMetrics::kOther_Font) {
if (!FT_IS_SCALABLE(face)) {
perGlyphInfo = SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo;
}
@ -652,9 +679,6 @@ SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics(
populate_glyph_to_unicode(face, &(info->fGlyphToUnicode));
}
if (!canEmbed(face))
info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
return info;
#endif
}

10
src/ports/SkFontHost_mac.cpp
View File

@ -1539,17 +1539,16 @@ SkAdvancedTypefaceMetrics* SkTypeface_Mac::onGetAdvancedTypefaceMetrics(
CFStringToSkString(fontName, &info->fFontName);
}
info->fMultiMaster = false;
CFIndex glyphCount = CTFontGetGlyphCount(ctFont);
info->fLastGlyphID = SkToU16(glyphCount - 1);
info->fEmSize = CTFontGetUnitsPerEm(ctFont);
info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag;
info->fStyle = 0;
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) {
populate_glyph_to_unicode(ctFont, glyphCount, &info->fGlyphToUnicode);
}
info->fStyle = 0;
// If it's not a truetype font, mark it as 'other'. Assume that TrueType
// fonts always have both glyf and loca tables. At the least, this is what
// sfntly needs to subset the font. CTFontCopyAttribute() does not always
@ -1613,10 +1612,7 @@ SkAdvancedTypefaceMetrics* SkTypeface_Mac::onGetAdvancedTypefaceMetrics(
}
}
if (false) { // TODO: haven't figured out how to know if font is embeddable
// (information is in the OS/2 table)
info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
} else if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (info->fStyle & SkAdvancedTypefaceMetrics::kFixedPitch_Style) {
skia_advanced_typeface_metrics_utils::appendRange(&info->fGlyphWidths, 0);
info->fGlyphWidths->fAdvance.append(1, &min_width);

18
src/ports/SkFontHost_win.cpp
View File

@ -1851,10 +1851,18 @@ SkAdvancedTypefaceMetrics* LogFontTypeface::onGetAdvancedTypefaceMetrics(
info = new SkAdvancedTypefaceMetrics;
info->fEmSize = otm.otmEMSquare;
info->fMultiMaster = false;
info->fLastGlyphID = SkToU16(glyphCount - 1);
info->fStyle = 0;
tchar_to_skstring(lf.lfFaceName, &info->fFontName);
info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag;
// If bit 1 is set, the font may not be embedded in a document.
// If bit 1 is clear, the font can be embedded.
// If bit 2 is set, the embedding is read-only.
if (otm.otmfsType & 0x1) {
info->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>(
info->fFlags,
SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag)
}
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) {
populate_glyph_to_unicode(hdc, glyphCount, &(info->fGlyphToUnicode));
@ -1915,13 +1923,7 @@ SkAdvancedTypefaceMetrics* LogFontTypeface::onGetAdvancedTypefaceMetrics(
}
}
// If bit 1 is set, the font may not be embedded in a document.
// If bit 1 is clear, the font can be embedded.
// If bit 2 is set, the embedding is read-only.
if (otm.otmfsType & 0x1) {
info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
} else if (perGlyphInfo &
SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (info->fStyle & SkAdvancedTypefaceMetrics::kFixedPitch_Style) {
appendRange(&info->fGlyphWidths, 0);
info->fGlyphWidths->fAdvance.append(1, &min_width);

10
src/ports/SkFontHost_win_dw.cpp
View File

@ -1490,10 +1490,9 @@ SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
info = new SkAdvancedTypefaceMetrics;
info->fEmSize = dwfm.designUnitsPerEm;
info->fMultiMaster = false;
info->fLastGlyphID = SkToU16(glyphCount - 1);
info->fStyle = 0;
info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag;
SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
SkTScopedComPtr<IDWriteLocalizedStrings> faceNames;
@ -1601,12 +1600,7 @@ SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
}
*/
// If Restricted, the font may not be embedded in a document.
// If not Restricted, the font can be embedded.
// If PreviewPrint, the embedding is read-only.
if (os2Table->version.v0.fsType.field.Restricted) {
info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
} else if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
if (fixedWidth) {
appendRange(&info->fGlyphWidths, 0);
int16_t advance;