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[PDF] Add replacement implementations for functions missing in older freetype libs.

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Review URL: http://codereview.appspot.com/4043044

git-svn-id: http://skia.googlecode.com/svn/trunk@743 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
vandebo@chromium.org 2011-01-28 21:28:56 +00:00
parent 02a7e6c117
commit 16be6b8fdf
1 changed files with 52 additions and 19 deletions
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71
src/ports/SkFontHost_FreeType.cpp
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@ -283,7 +283,45 @@ static void unref_ft_face(FT_Face face) {
///////////////////////////////////////////////////////////////////////////
#ifdef SK_SUPPORT_PDF
// Work around for old versions of freetype.
static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count,
FT_Int32 loadFlags, FT_Fixed* advances) {
#ifdef FT_ADVANCES_H
return FT_Get_Advances(face, start, count, loadFlags, advances);
#else
if (!face || start >= face->num_glyphs ||
start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) {
return 6; // "Invalid argument."
}
if (count == 0)
return 0;
for (int i = 0; i < count; i++) {
FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE);
if (err)
return err;
advances[i] = face->glyph->advance.x;
}
return 0;
#endif
}
static bool canEmbed(FT_Face face) {
#ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING
FT_UShort fsType = FT_Get_FSType_Flags(face);
return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0;
#else
// No embedding is 0x2 and bitmap embedding only is 0x200.
TT_OS2* os2_table;
if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) {
return (os2_table->fsType & 0x202) == 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)
@ -293,21 +331,22 @@ static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) {
return true;
}
int getWidthAdvance(FT_Face face, int gId, int scaleDivisor) {
static int getWidthAdvance(FT_Face face, int gId, int scaleDivisor) {
FT_Fixed unscaledAdvance = 0;
SkAssertResult(FT_Get_Advance(face, gId, FT_LOAD_NO_SCALE,
&unscaledAdvance) == 0);
SkAssertResult(getAdvances(face, gId, 1, FT_LOAD_NO_SCALE,
&unscaledAdvance) == 0);
return unscaledAdvance * 1000 / scaleDivisor;
}
template <typename Data>
void resetRange(SkPDFTypefaceInfo::AdvanceMetric<Data>* range, int startId) {
static void resetRange(SkPDFTypefaceInfo::AdvanceMetric<Data>* range,
int startId) {
range->fStartId = startId;
range->fAdvance.setCount(0);
}
template <typename Data>
SkPDFTypefaceInfo::AdvanceMetric<Data>* appendRange(
static SkPDFTypefaceInfo::AdvanceMetric<Data>* appendRange(
SkTScopedPtr<SkPDFTypefaceInfo::AdvanceMetric<Data> >* nextSlot,
int startId) {
nextSlot->reset(new SkPDFTypefaceInfo::AdvanceMetric<Data>);
@ -316,7 +355,7 @@ SkPDFTypefaceInfo::AdvanceMetric<Data>* appendRange(
}
template <typename Data>
void finishRange(
static void finishRange(
SkPDFTypefaceInfo::AdvanceMetric<Data>* range,
int endId,
typename SkPDFTypefaceInfo::AdvanceMetric<Data>::MetricType type) {
@ -332,7 +371,7 @@ void finishRange(
}
template <typename Data>
SkPDFTypefaceInfo::AdvanceMetric<Data>* getAdvanceData(
static SkPDFTypefaceInfo::AdvanceMetric<Data>* getAdvanceData(
FT_Face face,
int scaleDivisor,
Data (*getAdvance)(FT_Face face, int gId, int scaleDivisor)) {
@ -408,8 +447,7 @@ SkPDFTypefaceInfo* SkFontHost::GetPDFTypefaceInfo(uint32_t fontID) {
bool cid = false;
int scaleDivisor = 1000;
const char* fontType = FT_Get_X11_Font_Format(face);
if (FT_Get_FSType_Flags(face) & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) {
if (!canEmbed(face)) {
info->fType = SkPDFTypefaceInfo::kNotEmbeddable_Font;
} else if (FT_HAS_MULTIPLE_MASTERS(face)) {
// PDF requires that embedded MM fonts be reduced to a simple font.
@ -431,8 +469,10 @@ SkPDFTypefaceInfo* SkFontHost::GetPDFTypefaceInfo(uint32_t fontID) {
}
}
info->fFontName.set(FT_Get_Postscript_Name(face));
#ifdef FT_IS_CID_KEYED
SkASSERT(FT_IS_CID_KEYED(face) ==
(info->fType == SkPDFTypefaceInfo::kType1CID_Font));
#endif
if (info->fType == SkPDFTypefaceInfo::kOther_Font ||
info->fType == SkPDFTypefaceInfo::kNotEmbeddable_Font ||
@ -459,8 +499,8 @@ SkPDFTypefaceInfo* SkFontHost::GetPDFTypefaceInfo(uint32_t fontID) {
int advanceCount = 128;
if (gIDStart + advanceCount > face->num_glyphs)
advanceCount = face->num_glyphs - gIDStart + 1;
FT_Get_Advances(face, gIDStart, advanceCount, FT_LOAD_NO_SCALE,
advances);
getAdvances(face, gIDStart, advanceCount, FT_LOAD_NO_SCALE,
advances);
for (int i = 0; i < advanceCount; i++) {
int advance = advances[gIDStart + i];
info->fGlyphWidths->fAdvance.append(1, &advance);
@ -562,13 +602,6 @@ SkPDFTypefaceInfo* SkFontHost::GetPDFTypefaceInfo(uint32_t fontID) {
unref_ft_face(face);
return info;
}
#else
SkPDFTypefaceInfo* SkFontHost::GetPDFTypefaceInfo(uint32_t fontID) {
SkDebugf("--- GetPDFTypefaceInfo unimplemented\n");
return NULL;
}
#endif
///////////////////////////////////////////////////////////////////////////
void SkFontHost::FilterRec(SkScalerContext::Rec* rec) {