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/*
* 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 "SkAdvancedTypefaceMetrics.h"
#include "SkFontDescriptor.h"
#include "SkFontHost.h"
#include "SkFontStream.h"
#include "SkStream.h"
#include "SkTypeface.h"
SK_DEFINE_INST_COUNT(SkTypeface)
//#define TRACE_LIFECYCLE
#ifdef TRACE_LIFECYCLE
static int32_t gTypefaceCounter;
#endif
SkTypeface::SkTypeface(Style style, SkFontID fontID, bool isFixedPitch)
: fUniqueID(fontID), fStyle(style), fIsFixedPitch(isFixedPitch) {
#ifdef TRACE_LIFECYCLE
SkDebugf("SkTypeface: create %p fontID %d total %d\n",
this, fontID, ++gTypefaceCounter);
#endif
}
SkTypeface::~SkTypeface() {
#ifdef TRACE_LIFECYCLE
SkDebugf("SkTypeface: destroy %p fontID %d total %d\n",
this, fUniqueID, --gTypefaceCounter);
#endif
}
///////////////////////////////////////////////////////////////////////////////
SkTypeface* SkTypeface::GetDefaultTypeface(Style style) {
// we keep a reference to this guy for all time, since if we return its
// fontID, the font cache may later on ask to resolve that back into a
// typeface object.
static const uint32_t FONT_STYLE_COUNT = 4;
static SkTypeface* gDefaultTypefaces[FONT_STYLE_COUNT];
SkASSERT((unsigned)style < FONT_STYLE_COUNT);
// mask off any other bits to avoid a crash in SK_RELEASE
style = (Style)(style & 0x03);
if (NULL == gDefaultTypefaces[style]) {
gDefaultTypefaces[style] =
SkFontHost::CreateTypeface(NULL, NULL, style);
}
return gDefaultTypefaces[style];
}
SkTypeface* SkTypeface::RefDefault(Style style) {
return SkRef(GetDefaultTypeface(style));
}
uint32_t SkTypeface::UniqueID(const SkTypeface* face) {
if (NULL == face) {
face = GetDefaultTypeface();
}
return face->uniqueID();
}
bool SkTypeface::Equal(const SkTypeface* facea, const SkTypeface* faceb) {
return SkTypeface::UniqueID(facea) == SkTypeface::UniqueID(faceb);
}
///////////////////////////////////////////////////////////////////////////////
SkTypeface* SkTypeface::CreateFromName(const char name[], Style style) {
if (NULL == name) {
return RefDefault(style);
}
return SkFontHost::CreateTypeface(NULL, name, style);
}
SkTypeface* SkTypeface::CreateFromTypeface(const SkTypeface* family, Style s) {
if (family && family->style() == s) {
family->ref();
return const_cast<SkTypeface*>(family);
}
return SkFontHost::CreateTypeface(family, NULL, s);
}
SkTypeface* SkTypeface::CreateFromStream(SkStream* stream) {
return SkFontHost::CreateTypefaceFromStream(stream);
}
SkTypeface* SkTypeface::CreateFromFile(const char path[]) {
return SkFontHost::CreateTypefaceFromFile(path);
}
///////////////////////////////////////////////////////////////////////////////
void SkTypeface::serialize(SkWStream* wstream) const {
bool isLocal = false;
SkFontDescriptor desc(this->style());
this->onGetFontDescriptor(&desc, &isLocal);
desc.serialize(wstream);
if (isLocal) {
int ttcIndex; // TODO: write this to the stream?
SkAutoTUnref<SkStream> rstream(this->openStream(&ttcIndex));
if (rstream.get()) {
size_t length = rstream->getLength();
wstream->writePackedUInt(length);
wstream->writeStream(rstream, length);
} else {
wstream->writePackedUInt(0);
}
} else {
wstream->writePackedUInt(0);
}
}
SkTypeface* SkTypeface::Deserialize(SkStream* stream) {
SkFontDescriptor desc(stream);
size_t length = stream->readPackedUInt();
if (length > 0) {
void* addr = sk_malloc_flags(length, 0);
if (addr) {
SkAutoTUnref<SkMemoryStream> localStream(SkNEW(SkMemoryStream));
localStream->setMemoryOwned(addr, length);
if (stream->read(addr, length) == length) {
return SkTypeface::CreateFromStream(localStream.get());
} else {
// Failed to read the full font data, so fall through and try to create from name.
// If this is because of EOF, all subsequent reads from the stream will be EOF.
// If this is because of a stream error, the stream is in an error state,
// do not attempt to skip any remaining bytes.
}
} else {
// failed to allocate, so just skip and create-from-name
stream->skip(length);
}
}
return SkTypeface::CreateFromName(desc.getFamilyName(), desc.getStyle());
}
///////////////////////////////////////////////////////////////////////////////
int SkTypeface::countTables() const {
return this->onGetTableTags(NULL);
}
int SkTypeface::getTableTags(SkFontTableTag tags[]) const {
return this->onGetTableTags(tags);
}
size_t SkTypeface::getTableSize(SkFontTableTag tag) const {
return this->onGetTableData(tag, 0, ~0U, NULL);
}
size_t SkTypeface::getTableData(SkFontTableTag tag, size_t offset, size_t length,
void* data) const {
return this->onGetTableData(tag, offset, length, data);
}
SkStream* SkTypeface::openStream(int* ttcIndex) const {
int ttcIndexStorage;
if (NULL == ttcIndex) {
// So our subclasses don't need to check for null param
ttcIndex = &ttcIndexStorage;
}
return this->onOpenStream(ttcIndex);
}
int SkTypeface::charsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) const {
if (glyphCount <= 0) {
return 0;
}
if (NULL == chars || (unsigned)encoding > kUTF32_Encoding) {
if (glyphs) {
sk_bzero(glyphs, glyphCount * sizeof(glyphs[0]));
}
return 0;
}
return this->onCharsToGlyphs(chars, encoding, glyphs, glyphCount);
}
int SkTypeface::countGlyphs() const {
return this->onCountGlyphs();
}
int SkTypeface::getUnitsPerEm() const {
// should we try to cache this in the base-class?
return this->onGetUPEM();
}
SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics::PerGlyphInfo info,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
return this->onGetAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
int SkTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) const {
SkDebugf("onCharsToGlyphs unimplemented\n");
if (glyphs && glyphCount > 0) {
sk_bzero(glyphs, glyphCount * sizeof(glyphs[0]));
}
return 0;
}
int SkTypeface::onGetUPEM() const {
int upem = 0;
SkAdvancedTypefaceMetrics* metrics;
metrics = this->getAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo,
NULL, 0);
if (metrics) {
upem = metrics->fEmSize;
metrics->unref();
}
return upem;
}
int SkTypeface::onGetTableTags(SkFontTableTag tags[]) const {
int ttcIndex;
SkAutoTUnref<SkStream> stream(this->openStream(&ttcIndex));
return stream.get() ? SkFontStream::GetTableTags(stream, ttcIndex, tags) : 0;
}
size_t SkTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
size_t length, void* data) const {
int ttcIndex;
SkAutoTUnref<SkStream> stream(this->openStream(&ttcIndex));
return stream.get()
? SkFontStream::GetTableData(stream, ttcIndex, tag, offset, length, data)
: 0;
}
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