blob: eac2430f5f9f527cf8ee01c30faa0b0d2f0cf88f [file] [log] [blame]
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTextBlobRunIterator.h"
#include "SkPaintPriv.h"
#include "SkReadBuffer.h"
#include "SkSafeMath.h"
#include "SkTypeface.h"
#include "SkWriteBuffer.h"
#include <limits>
#if SK_SUPPORT_GPU
#include "text/GrTextBlobCache.h"
#endif
namespace {
// TODO(fmalita): replace with SkFont.
class RunFont : SkNoncopyable {
public:
RunFont(const SkPaint& paint)
: fSize(paint.getTextSize())
, fScaleX(paint.getTextScaleX())
, fTypeface(SkPaintPriv::RefTypefaceOrDefault(paint))
, fSkewX(paint.getTextSkewX())
, fAlign(paint.getTextAlign())
, fHinting(paint.getHinting())
, fFlags(paint.getFlags() & kFlagsMask) { }
void applyToPaint(SkPaint* paint) const {
paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
paint->setTypeface(fTypeface);
paint->setTextSize(fSize);
paint->setTextScaleX(fScaleX);
paint->setTextSkewX(fSkewX);
paint->setTextAlign(static_cast<SkPaint::Align>(fAlign));
paint->setHinting(static_cast<SkPaint::Hinting>(fHinting));
paint->setFlags((paint->getFlags() & ~kFlagsMask) | fFlags);
}
bool operator==(const RunFont& other) const {
return fTypeface == other.fTypeface
&& fSize == other.fSize
&& fScaleX == other.fScaleX
&& fSkewX == other.fSkewX
&& fAlign == other.fAlign
&& fHinting == other.fHinting
&& fFlags == other.fFlags;
}
bool operator!=(const RunFont& other) const {
return !(*this == other);
}
uint32_t flags() const { return fFlags; }
private:
const static uint32_t kFlagsMask =
SkPaint::kAntiAlias_Flag |
SkPaint::kFakeBoldText_Flag |
SkPaint::kLinearText_Flag |
SkPaint::kSubpixelText_Flag |
SkPaint::kDevKernText_Flag |
SkPaint::kLCDRenderText_Flag |
SkPaint::kEmbeddedBitmapText_Flag |
SkPaint::kAutoHinting_Flag |
SkPaint::kVerticalText_Flag |
SkPaint::kGenA8FromLCD_Flag;
SkScalar fSize;
SkScalar fScaleX;
// Keep this sk_sp off the first position, to avoid interfering with SkNoncopyable
// empty baseclass optimization (http://code.google.com/p/skia/issues/detail?id=3694).
sk_sp<SkTypeface> fTypeface;
SkScalar fSkewX;
static_assert(SkPaint::kAlignCount < 4, "insufficient_align_bits");
uint32_t fAlign : 2;
static_assert(SkPaint::kFull_Hinting < 4, "insufficient_hinting_bits");
uint32_t fHinting : 2;
static_assert((kFlagsMask & 0xffff) == kFlagsMask, "insufficient_flags_bits");
uint32_t fFlags : 16;
typedef SkNoncopyable INHERITED;
};
struct RunFontStorageEquivalent {
SkScalar fSize, fScaleX;
void* fTypeface;
SkScalar fSkewX;
uint32_t fFlags;
};
static_assert(sizeof(RunFont) == sizeof(RunFontStorageEquivalent), "runfont_should_stay_packed");
} // anonymous namespace
//
// Textblob data is laid out into externally-managed storage as follows:
//
// -----------------------------------------------------------------------------
// | SkTextBlob | RunRecord | Glyphs[] | Pos[] | RunRecord | Glyphs[] | Pos[] | ...
// -----------------------------------------------------------------------------
//
// Each run record describes a text blob run, and can be used to determine the (implicit)
// location of the following record.
//
// Extended Textblob runs have more data after the Pos[] array:
//
// -------------------------------------------------------------------------
// ... | RunRecord | Glyphs[] | Pos[] | TextSize | Clusters[] | Text[] | ...
// -------------------------------------------------------------------------
//
// To determine the length of the extended run data, the TextSize must be read.
//
// Extended Textblob runs may be mixed with non-extended runs.
SkDEBUGCODE(static const unsigned kRunRecordMagic = 0xb10bcafe;)
namespace {
struct RunRecordStorageEquivalent {
RunFont fFont;
SkPoint fOffset;
uint32_t fCount;
uint32_t fFlags;
SkDEBUGCODE(unsigned fMagic;)
};
}
class SkTextBlob::RunRecord {
public:
RunRecord(uint32_t count, uint32_t textSize, const SkPoint& offset, const SkPaint& font, GlyphPositioning pos)
: fFont(font)
, fCount(count)
, fOffset(offset)
, fFlags(pos) {
SkASSERT(static_cast<unsigned>(pos) <= Flags::kPositioning_Mask);
SkDEBUGCODE(fMagic = kRunRecordMagic);
if (textSize > 0) {
fFlags |= kExtended_Flag;
*this->textSizePtr() = textSize;
}
}
uint32_t glyphCount() const {
return fCount;
}
const SkPoint& offset() const {
return fOffset;
}
const RunFont& font() const {
return fFont;
}
GlyphPositioning positioning() const {
return static_cast<GlyphPositioning>(fFlags & kPositioning_Mask);
}
uint16_t* glyphBuffer() const {
static_assert(SkIsAlignPtr(sizeof(RunRecord)), "");
// Glyphs are stored immediately following the record.
return reinterpret_cast<uint16_t*>(const_cast<RunRecord*>(this) + 1);
}
SkScalar* posBuffer() const {
// Position scalars follow the (aligned) glyph buffer.
return reinterpret_cast<SkScalar*>(reinterpret_cast<uint8_t*>(this->glyphBuffer()) +
SkAlign4(fCount * sizeof(uint16_t)));
}
uint32_t textSize() const { return isExtended() ? *this->textSizePtr() : 0; }
uint32_t* clusterBuffer() const {
// clusters follow the textSize.
return isExtended() ? 1 + this->textSizePtr() : nullptr;
}
char* textBuffer() const {
return isExtended()
? reinterpret_cast<char*>(this->clusterBuffer() + fCount)
: nullptr;
}
static size_t StorageSize(uint32_t glyphCount, uint32_t textSize,
SkTextBlob::GlyphPositioning positioning,
SkSafeMath* safe) {
static_assert(SkIsAlign4(sizeof(SkScalar)), "SkScalar size alignment");
auto glyphSize = safe->mul(glyphCount, sizeof(uint16_t)),
posSize = safe->mul(PosCount(glyphCount, positioning, safe), sizeof(SkScalar));
// RunRecord object + (aligned) glyph buffer + position buffer
auto size = sizeof(SkTextBlob::RunRecord);
size = safe->add(size, safe->alignUp(glyphSize, 4));
size = safe->add(size, posSize);
if (textSize) { // Extended run.
size = safe->add(size, sizeof(uint32_t));
size = safe->add(size, safe->mul(glyphCount, sizeof(uint32_t)));
size = safe->add(size, textSize);
}
return safe->alignUp(size, sizeof(void*));
}
static const RunRecord* First(const SkTextBlob* blob) {
// The first record (if present) is stored following the blob object.
return reinterpret_cast<const RunRecord*>(blob + 1);
}
static const RunRecord* Next(const RunRecord* run) {
return SkToBool(run->fFlags & kLast_Flag) ? nullptr : NextUnchecked(run);
}
void validate(const uint8_t* storageTop) const {
SkASSERT(kRunRecordMagic == fMagic);
SkASSERT((uint8_t*)NextUnchecked(this) <= storageTop);
SkASSERT(glyphBuffer() + fCount <= (uint16_t*)posBuffer());
SkASSERT(posBuffer() + fCount * ScalarsPerGlyph(positioning())
<= (SkScalar*)NextUnchecked(this));
if (isExtended()) {
SkASSERT(textSize() > 0);
SkASSERT(textSizePtr() < (uint32_t*)NextUnchecked(this));
SkASSERT(clusterBuffer() < (uint32_t*)NextUnchecked(this));
SkASSERT(textBuffer() + textSize() <= (char*)NextUnchecked(this));
}
static_assert(sizeof(SkTextBlob::RunRecord) == sizeof(RunRecordStorageEquivalent),
"runrecord_should_stay_packed");
}
private:
friend class SkTextBlobBuilder;
enum Flags {
kPositioning_Mask = 0x03, // bits 0-1 reserved for positioning
kLast_Flag = 0x04, // set for the last blob run
kExtended_Flag = 0x08, // set for runs with text/cluster info
};
static const RunRecord* NextUnchecked(const RunRecord* run) {
SkSafeMath safe;
auto res = reinterpret_cast<const RunRecord*>(
reinterpret_cast<const uint8_t*>(run)
+ StorageSize(run->glyphCount(), run->textSize(), run->positioning(), &safe));
SkASSERT(safe);
return res;
}
static size_t PosCount(uint32_t glyphCount,
SkTextBlob::GlyphPositioning positioning,
SkSafeMath* safe) {
return safe->mul(glyphCount, ScalarsPerGlyph(positioning));
}
uint32_t* textSizePtr() const {
// textSize follows the position buffer.
SkASSERT(isExtended());
SkSafeMath safe;
auto res = (uint32_t*)(&this->posBuffer()[PosCount(fCount, positioning(), &safe)]);
SkASSERT(safe);
return res;
}
void grow(uint32_t count) {
SkScalar* initialPosBuffer = posBuffer();
uint32_t initialCount = fCount;
fCount += count;
// Move the initial pos scalars to their new location.
size_t copySize = initialCount * sizeof(SkScalar) * ScalarsPerGlyph(positioning());
SkASSERT((uint8_t*)posBuffer() + copySize <= (uint8_t*)NextUnchecked(this));
// memmove, as the buffers may overlap
memmove(posBuffer(), initialPosBuffer, copySize);
}
bool isExtended() const {
return fFlags & kExtended_Flag;
}
RunFont fFont;
uint32_t fCount;
SkPoint fOffset;
uint32_t fFlags;
SkDEBUGCODE(unsigned fMagic;)
};
static int32_t gNextID = 1;
static int32_t next_id() {
int32_t id;
do {
id = sk_atomic_inc(&gNextID);
} while (id == SK_InvalidGenID);
return id;
}
SkTextBlob::SkTextBlob(const SkRect& bounds)
: fBounds(bounds)
, fUniqueID(next_id())
, fCacheID(SK_InvalidUniqueID) {}
SkTextBlob::~SkTextBlob() {
#if SK_SUPPORT_GPU
if (SK_InvalidUniqueID != fCacheID.load()) {
GrTextBlobCache::PostPurgeBlobMessage(fUniqueID, fCacheID);
}
#endif
const auto* run = RunRecord::First(this);
do {
const auto* nextRun = RunRecord::Next(run);
SkDEBUGCODE(run->validate((uint8_t*)this + fStorageSize);)
run->~RunRecord();
run = nextRun;
} while (run);
}
namespace {
union PositioningAndExtended {
int32_t intValue;
struct {
SkTextBlob::GlyphPositioning positioning;
uint8_t extended;
uint16_t padding;
};
};
static_assert(sizeof(PositioningAndExtended) == sizeof(int32_t), "");
} // namespace
unsigned SkTextBlob::ScalarsPerGlyph(GlyphPositioning pos) {
// GlyphPositioning values are directly mapped to scalars-per-glyph.
SkASSERT(pos <= 2);
return pos;
}
SkTextBlobRunIterator::SkTextBlobRunIterator(const SkTextBlob* blob)
: fCurrentRun(SkTextBlob::RunRecord::First(blob)) {
SkDEBUGCODE(fStorageTop = (uint8_t*)blob + blob->fStorageSize;)
}
bool SkTextBlobRunIterator::done() const {
return !fCurrentRun;
}
void SkTextBlobRunIterator::next() {
SkASSERT(!this->done());
if (!this->done()) {
SkDEBUGCODE(fCurrentRun->validate(fStorageTop);)
fCurrentRun = SkTextBlob::RunRecord::Next(fCurrentRun);
}
}
uint32_t SkTextBlobRunIterator::glyphCount() const {
SkASSERT(!this->done());
return fCurrentRun->glyphCount();
}
const uint16_t* SkTextBlobRunIterator::glyphs() const {
SkASSERT(!this->done());
return fCurrentRun->glyphBuffer();
}
const SkScalar* SkTextBlobRunIterator::pos() const {
SkASSERT(!this->done());
return fCurrentRun->posBuffer();
}
const SkPoint& SkTextBlobRunIterator::offset() const {
SkASSERT(!this->done());
return fCurrentRun->offset();
}
SkTextBlob::GlyphPositioning SkTextBlobRunIterator::positioning() const {
SkASSERT(!this->done());
return fCurrentRun->positioning();
}
void SkTextBlobRunIterator::applyFontToPaint(SkPaint* paint) const {
SkASSERT(!this->done());
fCurrentRun->font().applyToPaint(paint);
}
uint32_t* SkTextBlobRunIterator::clusters() const {
SkASSERT(!this->done());
return fCurrentRun->clusterBuffer();
}
uint32_t SkTextBlobRunIterator::textSize() const {
SkASSERT(!this->done());
return fCurrentRun->textSize();
}
char* SkTextBlobRunIterator::text() const {
SkASSERT(!this->done());
return fCurrentRun->textBuffer();
}
bool SkTextBlobRunIterator::isLCD() const {
return SkToBool(fCurrentRun->font().flags() & SkPaint::kLCDRenderText_Flag);
}
SkTextBlobBuilder::SkTextBlobBuilder()
: fStorageSize(0)
, fStorageUsed(0)
, fRunCount(0)
, fDeferredBounds(false)
, fLastRun(0) {
fBounds.setEmpty();
}
SkTextBlobBuilder::~SkTextBlobBuilder() {
if (nullptr != fStorage.get()) {
// We are abandoning runs and must destruct the associated font data.
// The easiest way to accomplish that is to use the blob destructor.
this->make();
}
}
SkRect SkTextBlobBuilder::TightRunBounds(const SkTextBlob::RunRecord& run) {
SkRect bounds;
SkPaint paint;
run.font().applyToPaint(&paint);
if (SkTextBlob::kDefault_Positioning == run.positioning()) {
paint.measureText(run.glyphBuffer(), run.glyphCount() * sizeof(uint16_t), &bounds);
return bounds.makeOffset(run.offset().x(), run.offset().y());
}
SkAutoSTArray<16, SkRect> glyphBounds(run.glyphCount());
paint.getTextWidths(run.glyphBuffer(),
run.glyphCount() * sizeof(uint16_t),
nullptr,
glyphBounds.get());
SkASSERT(SkTextBlob::kFull_Positioning == run.positioning() ||
SkTextBlob::kHorizontal_Positioning == run.positioning());
// kFull_Positioning => [ x, y, x, y... ]
// kHorizontal_Positioning => [ x, x, x... ]
// (const y applied by runBounds.offset(run->offset()) later)
const SkScalar horizontalConstY = 0;
const SkScalar* glyphPosX = run.posBuffer();
const SkScalar* glyphPosY = (run.positioning() == SkTextBlob::kFull_Positioning) ?
glyphPosX + 1 : &horizontalConstY;
const unsigned posXInc = SkTextBlob::ScalarsPerGlyph(run.positioning());
const unsigned posYInc = (run.positioning() == SkTextBlob::kFull_Positioning) ?
posXInc : 0;
bounds.setEmpty();
for (unsigned i = 0; i < run.glyphCount(); ++i) {
bounds.join(glyphBounds[i].makeOffset(*glyphPosX, *glyphPosY));
glyphPosX += posXInc;
glyphPosY += posYInc;
}
SkASSERT((void*)glyphPosX <= SkTextBlob::RunRecord::Next(&run));
return bounds.makeOffset(run.offset().x(), run.offset().y());
}
SkRect SkTextBlobBuilder::ConservativeRunBounds(const SkTextBlob::RunRecord& run) {
SkASSERT(run.glyphCount() > 0);
SkASSERT(SkTextBlob::kFull_Positioning == run.positioning() ||
SkTextBlob::kHorizontal_Positioning == run.positioning());
SkPaint paint;
run.font().applyToPaint(&paint);
const SkRect fontBounds = paint.getFontBounds();
if (fontBounds.isEmpty()) {
// Empty font bounds are likely a font bug. TightBounds has a better chance of
// producing useful results in this case.
return TightRunBounds(run);
}
// Compute the glyph position bbox.
SkRect bounds;
switch (run.positioning()) {
case SkTextBlob::kHorizontal_Positioning: {
const SkScalar* glyphPos = run.posBuffer();
SkASSERT((void*)(glyphPos + run.glyphCount()) <= SkTextBlob::RunRecord::Next(&run));
SkScalar minX = *glyphPos;
SkScalar maxX = *glyphPos;
for (unsigned i = 1; i < run.glyphCount(); ++i) {
SkScalar x = glyphPos[i];
minX = SkMinScalar(x, minX);
maxX = SkMaxScalar(x, maxX);
}
bounds.setLTRB(minX, 0, maxX, 0);
} break;
case SkTextBlob::kFull_Positioning: {
const SkPoint* glyphPosPts = reinterpret_cast<const SkPoint*>(run.posBuffer());
SkASSERT((void*)(glyphPosPts + run.glyphCount()) <= SkTextBlob::RunRecord::Next(&run));
bounds.setBounds(glyphPosPts, run.glyphCount());
} break;
default:
SK_ABORT("unsupported positioning mode");
}
// Expand by typeface glyph bounds.
bounds.fLeft += fontBounds.left();
bounds.fTop += fontBounds.top();
bounds.fRight += fontBounds.right();
bounds.fBottom += fontBounds.bottom();
// Offset by run position.
return bounds.makeOffset(run.offset().x(), run.offset().y());
}
void SkTextBlobBuilder::updateDeferredBounds() {
SkASSERT(!fDeferredBounds || fRunCount > 0);
if (!fDeferredBounds) {
return;
}
SkASSERT(fLastRun >= sizeof(SkTextBlob));
SkTextBlob::RunRecord* run = reinterpret_cast<SkTextBlob::RunRecord*>(fStorage.get() +
fLastRun);
// FIXME: we should also use conservative bounds for kDefault_Positioning.
SkRect runBounds = SkTextBlob::kDefault_Positioning == run->positioning() ?
TightRunBounds(*run) : ConservativeRunBounds(*run);
fBounds.join(runBounds);
fDeferredBounds = false;
}
void SkTextBlobBuilder::reserve(size_t size) {
SkSafeMath safe;
// We don't currently pre-allocate, but maybe someday...
if (safe.add(fStorageUsed, size) <= fStorageSize && safe) {
return;
}
if (0 == fRunCount) {
SkASSERT(nullptr == fStorage.get());
SkASSERT(0 == fStorageSize);
SkASSERT(0 == fStorageUsed);
// the first allocation also includes blob storage
fStorageUsed = sizeof(SkTextBlob);
}
fStorageSize = safe.add(fStorageUsed, size);
// FYI: This relies on everything we store being relocatable, particularly SkPaint.
// Also, this is counting on the underlying realloc to throw when passed max().
fStorage.realloc(safe ? fStorageSize : std::numeric_limits<size_t>::max());
}
bool SkTextBlobBuilder::mergeRun(const SkPaint &font, SkTextBlob::GlyphPositioning positioning,
uint32_t count, SkPoint offset) {
if (0 == fLastRun) {
SkASSERT(0 == fRunCount);
return false;
}
SkASSERT(fLastRun >= sizeof(SkTextBlob));
SkTextBlob::RunRecord* run = reinterpret_cast<SkTextBlob::RunRecord*>(fStorage.get() +
fLastRun);
SkASSERT(run->glyphCount() > 0);
if (run->textSize() != 0) {
return false;
}
if (run->positioning() != positioning
|| run->font() != font
|| (run->glyphCount() + count < run->glyphCount())) {
return false;
}
// we can merge same-font/same-positioning runs in the following cases:
// * fully positioned run following another fully positioned run
// * horizontally postioned run following another horizontally positioned run with the same
// y-offset
if (SkTextBlob::kFull_Positioning != positioning
&& (SkTextBlob::kHorizontal_Positioning != positioning
|| run->offset().y() != offset.y())) {
return false;
}
SkSafeMath safe;
size_t sizeDelta =
SkTextBlob::RunRecord::StorageSize(run->glyphCount() + count, 0, positioning, &safe) -
SkTextBlob::RunRecord::StorageSize(run->glyphCount() , 0, positioning, &safe);
if (!safe) {
return false;
}
this->reserve(sizeDelta);
// reserve may have realloced
run = reinterpret_cast<SkTextBlob::RunRecord*>(fStorage.get() + fLastRun);
uint32_t preMergeCount = run->glyphCount();
run->grow(count);
// Callers expect the buffers to point at the newly added slice, ant not at the beginning.
fCurrentRunBuffer.glyphs = run->glyphBuffer() + preMergeCount;
fCurrentRunBuffer.pos = run->posBuffer()
+ preMergeCount * SkTextBlob::ScalarsPerGlyph(positioning);
fStorageUsed += sizeDelta;
SkASSERT(fStorageUsed <= fStorageSize);
run->validate(fStorage.get() + fStorageUsed);
return true;
}
void SkTextBlobBuilder::allocInternal(const SkPaint &font,
SkTextBlob::GlyphPositioning positioning,
int count, int textSize, SkPoint offset,
const SkRect* bounds) {
if (count <= 0 || textSize < 0 || font.getTextEncoding() != SkPaint::kGlyphID_TextEncoding) {
fCurrentRunBuffer = { nullptr, nullptr, nullptr, nullptr };
return;
}
if (textSize != 0 || !this->mergeRun(font, positioning, count, offset)) {
this->updateDeferredBounds();
SkSafeMath safe;
size_t runSize = SkTextBlob::RunRecord::StorageSize(count, textSize, positioning, &safe);
if (!safe) {
fCurrentRunBuffer = { nullptr, nullptr, nullptr, nullptr };
return;
}
this->reserve(runSize);
SkASSERT(fStorageUsed >= sizeof(SkTextBlob));
SkASSERT(fStorageUsed + runSize <= fStorageSize);
SkTextBlob::RunRecord* run = new (fStorage.get() + fStorageUsed)
SkTextBlob::RunRecord(count, textSize, offset, font, positioning);
fCurrentRunBuffer.glyphs = run->glyphBuffer();
fCurrentRunBuffer.pos = run->posBuffer();
fCurrentRunBuffer.utf8text = run->textBuffer();
fCurrentRunBuffer.clusters = run->clusterBuffer();
fLastRun = fStorageUsed;
fStorageUsed += runSize;
fRunCount++;
SkASSERT(fStorageUsed <= fStorageSize);
run->validate(fStorage.get() + fStorageUsed);
}
SkASSERT(textSize > 0 || nullptr == fCurrentRunBuffer.utf8text);
SkASSERT(textSize > 0 || nullptr == fCurrentRunBuffer.clusters);
if (!fDeferredBounds) {
if (bounds) {
fBounds.join(*bounds);
} else {
fDeferredBounds = true;
}
}
}
const SkTextBlobBuilder::RunBuffer& SkTextBlobBuilder::allocRunText(const SkPaint& font, int count,
SkScalar x, SkScalar y,
int textByteCount,
SkString lang,
const SkRect* bounds) {
this->allocInternal(font, SkTextBlob::kDefault_Positioning, count, textByteCount, SkPoint::Make(x, y), bounds);
return fCurrentRunBuffer;
}
const SkTextBlobBuilder::RunBuffer& SkTextBlobBuilder::allocRunTextPosH(const SkPaint& font, int count,
SkScalar y,
int textByteCount,
SkString lang,
const SkRect* bounds) {
this->allocInternal(font, SkTextBlob::kHorizontal_Positioning, count, textByteCount, SkPoint::Make(0, y),
bounds);
return fCurrentRunBuffer;
}
const SkTextBlobBuilder::RunBuffer& SkTextBlobBuilder::allocRunTextPos(const SkPaint& font, int count,
int textByteCount,
SkString lang,
const SkRect *bounds) {
this->allocInternal(font, SkTextBlob::kFull_Positioning, count, textByteCount, SkPoint::Make(0, 0), bounds);
return fCurrentRunBuffer;
}
sk_sp<SkTextBlob> SkTextBlobBuilder::make() {
if (!fRunCount) {
// We don't instantiate empty blobs.
SkASSERT(!fStorage.get());
SkASSERT(fStorageUsed == 0);
SkASSERT(fStorageSize == 0);
SkASSERT(fLastRun == 0);
SkASSERT(fBounds.isEmpty());
return nullptr;
}
this->updateDeferredBounds();
// Tag the last run as such.
auto* lastRun = reinterpret_cast<SkTextBlob::RunRecord*>(fStorage.get() + fLastRun);
lastRun->fFlags |= SkTextBlob::RunRecord::kLast_Flag;
SkTextBlob* blob = new (fStorage.release()) SkTextBlob(fBounds);
SkDEBUGCODE(const_cast<SkTextBlob*>(blob)->fStorageSize = fStorageSize;)
SkDEBUGCODE(
SkSafeMath safe;
size_t validateSize = sizeof(SkTextBlob);
for (const auto* run = SkTextBlob::RunRecord::First(blob); run;
run = SkTextBlob::RunRecord::Next(run)) {
validateSize += SkTextBlob::RunRecord::StorageSize(
run->fCount, run->textSize(), run->positioning(), &safe);
run->validate(reinterpret_cast<const uint8_t*>(blob) + fStorageUsed);
fRunCount--;
}
SkASSERT(validateSize == fStorageUsed);
SkASSERT(fRunCount == 0);
SkASSERT(safe);
)
fStorageUsed = 0;
fStorageSize = 0;
fRunCount = 0;
fLastRun = 0;
fBounds.setEmpty();
return sk_sp<SkTextBlob>(blob);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void SkTextBlob::flatten(SkWriteBuffer& buffer) const {
buffer.writeRect(fBounds);
SkPaint runPaint;
SkTextBlobRunIterator it(this);
while (!it.done()) {
SkASSERT(it.glyphCount() > 0);
buffer.write32(it.glyphCount());
PositioningAndExtended pe;
pe.intValue = 0;
pe.positioning = it.positioning();
SkASSERT((int32_t)it.positioning() == pe.intValue); // backwards compat.
uint32_t textSize = it.textSize();
pe.extended = textSize > 0;
buffer.write32(pe.intValue);
if (pe.extended) {
buffer.write32(textSize);
}
buffer.writePoint(it.offset());
// This should go away when switching to SkFont
it.applyFontToPaint(&runPaint);
buffer.writePaint(runPaint);
buffer.writeByteArray(it.glyphs(), it.glyphCount() * sizeof(uint16_t));
buffer.writeByteArray(it.pos(),
it.glyphCount() * sizeof(SkScalar) * ScalarsPerGlyph(it.positioning()));
if (pe.extended) {
buffer.writeByteArray(it.clusters(), sizeof(uint32_t) * it.glyphCount());
buffer.writeByteArray(it.text(), it.textSize());
}
it.next();
}
// Marker for the last run (0 is not a valid glyph count).
buffer.write32(0);
}
sk_sp<SkTextBlob> SkTextBlob::MakeFromBuffer(SkReadBuffer& reader) {
SkRect bounds;
reader.readRect(&bounds);
SkTextBlobBuilder blobBuilder;
for (;;) {
int glyphCount = reader.read32();
if (glyphCount == 0) {
// End-of-runs marker.
break;
}
PositioningAndExtended pe;
pe.intValue = reader.read32();
GlyphPositioning pos = pe.positioning;
if (glyphCount <= 0 || pos > kFull_Positioning) {
return nullptr;
}
int textSize = pe.extended ? reader.read32() : 0;
if (textSize < 0 || static_cast<size_t>(textSize) > reader.size()) {
return nullptr;
}
SkPoint offset;
reader.readPoint(&offset);
SkPaint font;
reader.readPaint(&font);
if (!reader.isValid()) {
return nullptr;
}
const SkTextBlobBuilder::RunBuffer* buf = nullptr;
switch (pos) {
case kDefault_Positioning:
buf = &blobBuilder.allocRunText(font, glyphCount, offset.x(), offset.y(),
textSize, SkString(), &bounds);
break;
case kHorizontal_Positioning:
buf = &blobBuilder.allocRunTextPosH(font, glyphCount, offset.y(),
textSize, SkString(), &bounds);
break;
case kFull_Positioning:
buf = &blobBuilder.allocRunTextPos(font, glyphCount, textSize, SkString(), &bounds);
break;
default:
return nullptr;
}
if (!buf->glyphs ||
!buf->pos ||
(pe.extended && (!buf->clusters || !buf->utf8text))) {
return nullptr;
}
if (!reader.readByteArray(buf->glyphs, glyphCount * sizeof(uint16_t)) ||
!reader.readByteArray(buf->pos,
glyphCount * sizeof(SkScalar) * ScalarsPerGlyph(pos))) {
return nullptr;
}
if (pe.extended) {
if (!reader.readByteArray(buf->clusters, glyphCount * sizeof(uint32_t)) ||
!reader.readByteArray(buf->utf8text, textSize)) {
return nullptr;
}
}
}
return blobBuilder.make();
}
sk_sp<SkData> SkTextBlob::serialize(const SkSerialProcs& procs) const {
SkBinaryWriteBuffer buffer;
buffer.setSerialProcs(procs);
this->flatten(buffer);
size_t total = buffer.bytesWritten();
sk_sp<SkData> data = SkData::MakeUninitialized(total);
buffer.writeToMemory(data->writable_data());
return data;
}
sk_sp<SkData> SkTextBlob::serialize() const {
return this->serialize(SkSerialProcs());
}
sk_sp<SkTextBlob> SkTextBlob::Deserialize(const void* data, size_t length,
const SkDeserialProcs& procs) {
SkReadBuffer buffer(data, length);
buffer.setDeserialProcs(procs);
return SkTextBlob::MakeFromBuffer(buffer);
}
sk_sp<SkTextBlob> SkTextBlob::Deserialize(const void* data, size_t length) {
return SkTextBlob::Deserialize(data, length, SkDeserialProcs());
}
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace {
struct CatalogState {
SkTypefaceCatalogerProc fProc;
void* fCtx;
};
sk_sp<SkData> catalog_typeface_proc(SkTypeface* face, void* ctx) {
CatalogState* state = static_cast<CatalogState*>(ctx);
state->fProc(face, state->fCtx);
uint32_t id = face->uniqueID();
return SkData::MakeWithCopy(&id, sizeof(uint32_t));
}
}
sk_sp<SkData> SkTextBlob::serialize(SkTypefaceCatalogerProc proc, void* ctx) const {
CatalogState state = { proc, ctx };
SkSerialProcs procs;
procs.fTypefaceProc = catalog_typeface_proc;
procs.fTypefaceCtx = &state;
return this->serialize(procs);
}
size_t SkTextBlob::serialize(const SkSerialProcs& procs, void* memory, size_t memory_size) const {
SkBinaryWriteBuffer buffer(memory, memory_size);
buffer.setSerialProcs(procs);
this->flatten(buffer);
return buffer.usingInitialStorage() ? buffer.bytesWritten() : 0u;
}
namespace {
struct ResolverState {
SkTypefaceResolverProc fProc;
void* fCtx;
};
sk_sp<SkTypeface> resolver_typeface_proc(const void* data, size_t length, void* ctx) {
if (length != 4) {
return nullptr;
}
ResolverState* state = static_cast<ResolverState*>(ctx);
uint32_t id;
memcpy(&id, data, length);
return state->fProc(id, state->fCtx);
}
}
sk_sp<SkTextBlob> SkTextBlob::Deserialize(const void* data, size_t length,
SkTypefaceResolverProc proc, void* ctx) {
ResolverState state = { proc, ctx };
SkDeserialProcs procs;
procs.fTypefaceProc = resolver_typeface_proc;
procs.fTypefaceCtx = &state;
return Deserialize(data, length, procs);
}