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skia / skia / 1e259cda4fb7f12e98dd611bd651f40ebef2d14a / . / src / core / SkPaint.cpp
blob: 7643bab737c1a8fac9f67486705fc8262bfe1c0b [file] [log] [blame]
/*
* Copyright 2006 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 "SkPaint.h"
#include "SkColorFilter.h"
#include "SkData.h"
#include "SkDraw.h"
#include "SkFontDescriptor.h"
#include "SkGlyphCache.h"
#include "SkGraphics.h"
#include "SkImageFilter.h"
#include "SkMaskFilter.h"
#include "SkMaskGamma.h"
#include "SkMutex.h"
#include "SkOpts.h"
#include "SkPaintDefaults.h"
#include "SkPaintPriv.h"
#include "SkPathEffect.h"
#include "SkReadBuffer.h"
#include "SkSafeRange.h"
#include "SkScalar.h"
#include "SkScalerContext.h"
#include "SkShader.h"
#include "SkShaderBase.h"
#include "SkStringUtils.h"
#include "SkStroke.h"
#include "SkStrokeRec.h"
#include "SkSurfacePriv.h"
#include "SkTLazy.h"
#include "SkTextBlob.h"
#include "SkTextBlobRunIterator.h"
#include "SkTextFormatParams.h"
#include "SkTextToPathIter.h"
#include "SkTo.h"
#include "SkTypeface.h"
#include "SkWriteBuffer.h"
static inline uint32_t set_clear_mask(uint32_t bits, bool cond, uint32_t mask) {
return cond ? bits | mask : bits & ~mask;
}
// define this to get a printf for out-of-range parameter in setters
// e.g. setTextSize(-1)
//#define SK_REPORT_API_RANGE_CHECK
SkPaint::SkPaint() {
fTextSize = SkPaintDefaults_TextSize;
fTextScaleX = SK_Scalar1;
fTextSkewX = 0;
fColor = SK_ColorBLACK;
fWidth = 0;
fMiterLimit = SkPaintDefaults_MiterLimit;
fBlendMode = (unsigned)SkBlendMode::kSrcOver;
// Zero all bitfields, then set some non-zero defaults.
fBitfieldsUInt = 0;
fBitfields.fFlags = SkPaintDefaults_Flags;
fBitfields.fCapType = kDefault_Cap;
fBitfields.fJoinType = kDefault_Join;
fBitfields.fTextAlign = kLeft_Align;
fBitfields.fStyle = kFill_Style;
fBitfields.fTextEncoding = kUTF8_TextEncoding;
fBitfields.fHinting = SkPaintDefaults_Hinting;
}
SkPaint::SkPaint(const SkPaint& src)
#define COPY(field) field(src.field)
: COPY(fTypeface)
, COPY(fPathEffect)
, COPY(fShader)
, COPY(fMaskFilter)
, COPY(fColorFilter)
, COPY(fDrawLooper)
, COPY(fImageFilter)
, COPY(fTextSize)
, COPY(fTextScaleX)
, COPY(fTextSkewX)
, COPY(fColor)
, COPY(fWidth)
, COPY(fMiterLimit)
, COPY(fBlendMode)
, COPY(fBitfields)
#undef COPY
{}
SkPaint::SkPaint(SkPaint&& src) {
#define MOVE(field) field = std::move(src.field)
MOVE(fTypeface);
MOVE(fPathEffect);
MOVE(fShader);
MOVE(fMaskFilter);
MOVE(fColorFilter);
MOVE(fDrawLooper);
MOVE(fImageFilter);
MOVE(fTextSize);
MOVE(fTextScaleX);
MOVE(fTextSkewX);
MOVE(fColor);
MOVE(fWidth);
MOVE(fMiterLimit);
MOVE(fBlendMode);
MOVE(fBitfields);
#undef MOVE
}
SkPaint::~SkPaint() {}
SkPaint& SkPaint::operator=(const SkPaint& src) {
if (this == &src) {
return *this;
}
#define ASSIGN(field) field = src.field
ASSIGN(fTypeface);
ASSIGN(fPathEffect);
ASSIGN(fShader);
ASSIGN(fMaskFilter);
ASSIGN(fColorFilter);
ASSIGN(fDrawLooper);
ASSIGN(fImageFilter);
ASSIGN(fTextSize);
ASSIGN(fTextScaleX);
ASSIGN(fTextSkewX);
ASSIGN(fColor);
ASSIGN(fWidth);
ASSIGN(fMiterLimit);
ASSIGN(fBlendMode);
ASSIGN(fBitfields);
#undef ASSIGN
return *this;
}
SkPaint& SkPaint::operator=(SkPaint&& src) {
if (this == &src) {
return *this;
}
#define MOVE(field) field = std::move(src.field)
MOVE(fTypeface);
MOVE(fPathEffect);
MOVE(fShader);
MOVE(fMaskFilter);
MOVE(fColorFilter);
MOVE(fDrawLooper);
MOVE(fImageFilter);
MOVE(fTextSize);
MOVE(fTextScaleX);
MOVE(fTextSkewX);
MOVE(fColor);
MOVE(fWidth);
MOVE(fMiterLimit);
MOVE(fBlendMode);
MOVE(fBitfields);
#undef MOVE
return *this;
}
bool operator==(const SkPaint& a, const SkPaint& b) {
#define EQUAL(field) (a.field == b.field)
return EQUAL(fTypeface)
&& EQUAL(fPathEffect)
&& EQUAL(fShader)
&& EQUAL(fMaskFilter)
&& EQUAL(fColorFilter)
&& EQUAL(fDrawLooper)
&& EQUAL(fImageFilter)
&& EQUAL(fTextSize)
&& EQUAL(fTextScaleX)
&& EQUAL(fTextSkewX)
&& EQUAL(fColor)
&& EQUAL(fWidth)
&& EQUAL(fMiterLimit)
&& EQUAL(fBlendMode)
&& EQUAL(fBitfieldsUInt)
;
#undef EQUAL
}
#define DEFINE_REF_FOO(type) sk_sp<Sk##type> SkPaint::ref##type() const { return f##type; }
DEFINE_REF_FOO(ColorFilter)
DEFINE_REF_FOO(DrawLooper)
DEFINE_REF_FOO(ImageFilter)
DEFINE_REF_FOO(MaskFilter)
DEFINE_REF_FOO(PathEffect)
DEFINE_REF_FOO(Shader)
DEFINE_REF_FOO(Typeface)
#undef DEFINE_REF_FOO
void SkPaint::reset() {
SkPaint init;
*this = init;
}
void SkPaint::setFilterQuality(SkFilterQuality quality) {
fBitfields.fFilterQuality = quality;
}
void SkPaint::setHinting(Hinting hintingLevel) {
fBitfields.fHinting = hintingLevel;
}
void SkPaint::setFlags(uint32_t flags) {
fBitfields.fFlags = flags;
}
void SkPaint::setAntiAlias(bool doAA) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doAA, kAntiAlias_Flag));
}
void SkPaint::setDither(bool doDither) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doDither, kDither_Flag));
}
void SkPaint::setSubpixelText(bool doSubpixel) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doSubpixel, kSubpixelText_Flag));
}
void SkPaint::setLCDRenderText(bool doLCDRender) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doLCDRender, kLCDRenderText_Flag));
}
void SkPaint::setEmbeddedBitmapText(bool doEmbeddedBitmapText) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doEmbeddedBitmapText, kEmbeddedBitmapText_Flag));
}
void SkPaint::setAutohinted(bool useAutohinter) {
this->setFlags(set_clear_mask(fBitfields.fFlags, useAutohinter, kAutoHinting_Flag));
}
void SkPaint::setLinearText(bool doLinearText) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doLinearText, kLinearText_Flag));
}
void SkPaint::setVerticalText(bool doVertical) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doVertical, kVerticalText_Flag));
}
void SkPaint::setFakeBoldText(bool doFakeBold) {
this->setFlags(set_clear_mask(fBitfields.fFlags, doFakeBold, kFakeBoldText_Flag));
}
void SkPaint::setStyle(Style style) {
if ((unsigned)style < kStyleCount) {
fBitfields.fStyle = style;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStyle(%d) out of range\n", style);
#endif
}
}
void SkPaint::setColor(SkColor color) {
fColor = color;
}
void SkPaint::setAlpha(U8CPU a) {
this->setColor(SkColorSetARGB(a, SkColorGetR(fColor),
SkColorGetG(fColor), SkColorGetB(fColor)));
}
void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
this->setColor(SkColorSetARGB(a, r, g, b));
}
void SkPaint::setStrokeWidth(SkScalar width) {
if (width >= 0) {
fWidth = width;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeWidth() called with negative value\n");
#endif
}
}
void SkPaint::setStrokeMiter(SkScalar limit) {
if (limit >= 0) {
fMiterLimit = limit;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeMiter() called with negative value\n");
#endif
}
}
void SkPaint::setStrokeCap(Cap ct) {
if ((unsigned)ct < kCapCount) {
fBitfields.fCapType = SkToU8(ct);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct);
#endif
}
}
void SkPaint::setStrokeJoin(Join jt) {
if ((unsigned)jt < kJoinCount) {
fBitfields.fJoinType = SkToU8(jt);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt);
#endif
}
}
///////////////////////////////////////////////////////////////////////////////
void SkPaint::setTextAlign(Align align) {
if ((unsigned)align < kAlignCount) {
fBitfields.fTextAlign = SkToU8(align);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextAlign(%d) out of range\n", align);
#endif
}
}
void SkPaint::setTextSize(SkScalar ts) {
if (ts >= 0) {
fTextSize = ts;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextSize() called with negative value\n");
#endif
}
}
void SkPaint::setTextScaleX(SkScalar scaleX) {
fTextScaleX = scaleX;
}
void SkPaint::setTextSkewX(SkScalar skewX) {
fTextSkewX = skewX;
}
void SkPaint::setTextEncoding(TextEncoding encoding) {
if ((unsigned)encoding <= kGlyphID_TextEncoding) {
fBitfields.fTextEncoding = encoding;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextEncoding(%d) out of range\n", encoding);
#endif
}
}
///////////////////////////////////////////////////////////////////////////////
#define MOVE_FIELD(Field) void SkPaint::set##Field(sk_sp<Sk##Field> f) { f##Field = std::move(f); }
MOVE_FIELD(Typeface)
MOVE_FIELD(ImageFilter)
MOVE_FIELD(Shader)
MOVE_FIELD(ColorFilter)
MOVE_FIELD(PathEffect)
MOVE_FIELD(MaskFilter)
MOVE_FIELD(DrawLooper)
#undef MOVE_FIELD
void SkPaint::setLooper(sk_sp<SkDrawLooper> looper) { fDrawLooper = std::move(looper); }
///////////////////////////////////////////////////////////////////////////////
static SkScalar mag2(SkScalar x, SkScalar y) {
return x * x + y * y;
}
static bool tooBig(const SkMatrix& m, SkScalar ma2max) {
return mag2(m[SkMatrix::kMScaleX], m[SkMatrix::kMSkewY]) > ma2max
||
mag2(m[SkMatrix::kMSkewX], m[SkMatrix::kMScaleY]) > ma2max;
}
bool SkPaint::TooBigToUseCache(const SkMatrix& ctm, const SkMatrix& textM, SkScalar maxLimit) {
SkASSERT(!ctm.hasPerspective());
SkASSERT(!textM.hasPerspective());
SkMatrix matrix;
matrix.setConcat(ctm, textM);
return tooBig(matrix, MaxCacheSize2(maxLimit));
}
SkScalar SkPaint::MaxCacheSize2(SkScalar maxLimit) {
// we have a self-imposed maximum, just for memory-usage sanity
const int limit = SkMin32(SkGraphics::GetFontCachePointSizeLimit(), maxLimit);
const SkScalar maxSize = SkIntToScalar(limit);
return maxSize * maxSize;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkGlyphCache.h"
#include "SkUtils.h"
int SkPaint::countText(const void* text, size_t byteLength) const {
SkASSERT(text != nullptr);
switch (this->getTextEncoding()) {
case kUTF8_TextEncoding:
return SkUTF8_CountUnichars(text, byteLength);
case kUTF16_TextEncoding:
return SkUTF16_CountUnichars(text, byteLength);
case kUTF32_TextEncoding:
return SkToInt(byteLength >> 2);
case kGlyphID_TextEncoding:
return SkToInt(byteLength >> 1);
default:
SkDEBUGFAIL("unknown text encoding");
}
return 0;
}
int SkPaint::textToGlyphs(const void* textData, size_t byteLength, uint16_t glyphs[]) const {
SkASSERT(textData != nullptr);
if (nullptr == glyphs) {
return this->countText(textData, byteLength);
}
// if we get here, we have a valid glyphs[] array, so time to fill it in
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
// we want to ignore the low bit of byteLength
memcpy(glyphs, textData, byteLength >> 1 << 1);
return SkToInt(byteLength >> 1);
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
uint16_t* gptr = glyphs;
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding:
while (text < stop) {
SkUnichar u = SkUTF8_NextUnicharWithError(&text, stop);
if (u < 0) {
return 0; // bad UTF-8 sequence
}
*gptr++ = cache->unicharToGlyph(u);
}
break;
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text16 = (const uint16_t*)text;
const uint16_t* stop16 = (const uint16_t*)stop;
while (text16 < stop16) {
*gptr++ = cache->unicharToGlyph(SkUTF16_NextUnichar(&text16));
}
break;
}
case kUTF32_TextEncoding: {
const int32_t* text32 = (const int32_t*)text;
const int32_t* stop32 = (const int32_t*)stop;
while (text32 < stop32) {
*gptr++ = cache->unicharToGlyph(*text32++);
}
break;
}
default:
SkDEBUGFAIL("unknown text encoding");
}
return SkToInt(gptr - glyphs);
}
bool SkPaint::containsText(const void* textData, size_t byteLength) const {
if (0 == byteLength) {
return true;
}
SkASSERT(textData != nullptr);
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
const uint16_t* glyphID = static_cast<const uint16_t*>(textData);
size_t count = byteLength >> 1;
for (size_t i = 0; i < count; i++) {
if (0 == glyphID[i]) {
return false;
}
}
return true;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*this);
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding: {
const char* text = static_cast<const char*>(textData);
const char* stop = text + byteLength;
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF8_NextUnichar(&text))) {
return false;
}
}
break;
}
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text = static_cast<const uint16_t*>(textData);
const uint16_t* stop = text + (byteLength >> 1);
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF16_NextUnichar(&text))) {
return false;
}
}
break;
}
case SkPaint::kUTF32_TextEncoding: {
const int32_t* text = static_cast<const int32_t*>(textData);
const int32_t* stop = text + (byteLength >> 2);
while (text < stop) {
if (0 == cache->unicharToGlyph(*text++)) {
return false;
}
}
break;
}
default:
SkDEBUGFAIL("unknown text encoding");
return false;
}
return true;
}
void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count, SkUnichar textData[]) const {
if (count <= 0) {
return;
}
SkASSERT(glyphs != nullptr);
SkASSERT(textData != nullptr);
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(
*this, &props, SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
for (int index = 0; index < count; index++) {
textData[index] = cache->glyphToUnichar(glyphs[index]);
}
}
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_utf32_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const int32_t* ptr = *(const int32_t**)text;
SkUnichar uni = *ptr++;
*text = (const char*)ptr;
return cache->getUnicharMetrics(uni);
}
static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getAdvance_utf8_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
return cache->getUnicharAdvance(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getAdvance_utf32_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const int32_t* ptr = *(const int32_t**)text;
SkUnichar uni = *ptr++;
*text = (const char*)ptr;
return cache->getUnicharAdvance(uni);
}
static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != nullptr);
SkASSERT(text != nullptr);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
SkPaint::GlyphCacheProc SkPaint::GetGlyphCacheProc(TextEncoding encoding,
bool needFullMetrics) {
static const GlyphCacheProc gGlyphCacheProcs[] = {
sk_getMetrics_utf8_next,
sk_getMetrics_utf16_next,
sk_getMetrics_utf32_next,
sk_getMetrics_glyph_next,
sk_getAdvance_utf8_next,
sk_getAdvance_utf16_next,
sk_getAdvance_utf32_next,
sk_getAdvance_glyph_next,
};
unsigned index = encoding;
if (!needFullMetrics) {
index += 4;
}
SkASSERT(index < SK_ARRAY_COUNT(gGlyphCacheProcs));
return gGlyphCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
#define TEXT_AS_PATHS_PAINT_FLAGS_TO_IGNORE ( \
SkPaint::kLinearText_Flag | \
SkPaint::kLCDRenderText_Flag | \
SkPaint::kEmbeddedBitmapText_Flag | \
SkPaint::kAutoHinting_Flag )
SkScalar SkPaint::setupForAsPaths() {
uint32_t flags = this->getFlags();
// clear the flags we don't care about
flags &= ~TEXT_AS_PATHS_PAINT_FLAGS_TO_IGNORE;
// set the flags we do care about
flags |= SkPaint::kSubpixelText_Flag;
this->setFlags(flags);
this->setHinting(SkPaint::kNo_Hinting);
SkScalar textSize = fTextSize;
this->setTextSize(kCanonicalTextSizeForPaths);
return textSize / kCanonicalTextSizeForPaths;
}
class SkCanonicalizePaint {
public:
SkCanonicalizePaint(const SkPaint& paint) : fPaint(&paint), fScale(0) {
if (paint.isLinearText() || SkDraw::ShouldDrawTextAsPaths(paint, SkMatrix::I())) {
SkPaint* p = fLazy.set(paint);
fScale = p->setupForAsPaths();
fPaint = p;
}
}
const SkPaint& getPaint() const { return *fPaint; }
/**
* Returns 0 if the paint was unmodified, or the scale factor need to
* the original textSize
*/
SkScalar getScale() const { return fScale; }
private:
const SkPaint* fPaint;
SkScalar fScale;
SkTLazy<SkPaint> fLazy;
};
static void set_bounds(const SkGlyph& g, SkRect* bounds) {
bounds->set(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight));
}
static void join_bounds_x(const SkGlyph& g, SkRect* bounds, SkScalar dx) {
bounds->join(SkIntToScalar(g.fLeft) + dx,
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth) + dx,
SkIntToScalar(g.fTop + g.fHeight));
}
static void join_bounds_y(const SkGlyph& g, SkRect* bounds, SkScalar dy) {
bounds->join(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop) + dy,
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight) + dy);
}
typedef void (*JoinBoundsProc)(const SkGlyph&, SkRect*, SkScalar);
// xyIndex is 0 for fAdvanceX or 1 for fAdvanceY
static SkScalar advance(const SkGlyph& glyph, int xyIndex) {
SkASSERT(0 == xyIndex || 1 == xyIndex);
return SkFloatToScalar((&glyph.fAdvanceX)[xyIndex]);
}
SkScalar SkPaint::measure_text(SkGlyphCache* cache,
const char* text, size_t byteLength,
int* count, SkRect* bounds) const {
SkASSERT(count);
if (byteLength == 0) {
*count = 0;
if (bounds) {
bounds->setEmpty();
}
return 0;
}
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(this->getTextEncoding(),
nullptr != bounds);
int xyIndex;
JoinBoundsProc joinBoundsProc;
if (this->isVerticalText()) {
xyIndex = 1;
joinBoundsProc = join_bounds_y;
} else {
xyIndex = 0;
joinBoundsProc = join_bounds_x;
}
int n = 1;
const char* stop = (const char*)text + byteLength;
const SkGlyph* g = &glyphCacheProc(cache, &text);
SkScalar x = advance(*g, xyIndex);
if (nullptr == bounds) {
for (; text < stop; n++) {
x += advance(glyphCacheProc(cache, &text), xyIndex);
}
} else {
set_bounds(*g, bounds);
for (; text < stop; n++) {
g = &glyphCacheProc(cache, &text);
joinBoundsProc(*g, bounds, x);
x += advance(*g, xyIndex);
}
}
SkASSERT(text == stop);
*count = n;
return x;
}
SkScalar SkPaint::measureText(const void* textData, size_t length, SkRect* bounds) const {
const char* text = (const char*)textData;
SkASSERT(text != nullptr || length == 0);
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
SkScalar width = 0;
if (length > 0) {
int tempCount;
width = paint.measure_text(cache.get(), text, length, &tempCount, bounds);
if (scale) {
width *= scale;
if (bounds) {
bounds->fLeft *= scale;
bounds->fTop *= scale;
bounds->fRight *= scale;
bounds->fBottom *= scale;
}
}
} else if (bounds) {
// ensure that even if we don't measure_text we still update the bounds
bounds->setEmpty();
}
return width;
}
size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth,
SkScalar* measuredWidth) const {
if (0 == length || 0 >= maxWidth) {
if (measuredWidth) {
*measuredWidth = 0;
}
return 0;
}
if (0 == fTextSize) {
if (measuredWidth) {
*measuredWidth = 0;
}
return length;
}
SkASSERT(textD != nullptr);
const char* text = (const char*)textD;
const char* stop = text + length;
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
// adjust max in case we changed the textSize in paint
if (scale) {
maxWidth /= scale;
}
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
false);
const int xyIndex = paint.isVerticalText() ? 1 : 0;
SkScalar width = 0;
while (text < stop) {
const char* curr = text;
SkScalar x = advance(glyphCacheProc(cache.get(), &text), xyIndex);
if ((width += x) > maxWidth) {
width -= x;
text = curr;
break;
}
}
if (measuredWidth) {
if (scale) {
width *= scale;
}
*measuredWidth = width;
}
// return the number of bytes measured
return text - stop + length;
}
///////////////////////////////////////////////////////////////////////////////
SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const {
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
SkMatrix zoomMatrix, *zoomPtr = nullptr;
if (zoom) {
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
FontMetrics storage;
if (nullptr == metrics) {
metrics = &storage;
}
SkAutoDescriptor ad;
SkScalerContextEffects effects;
auto desc = SkScalerContext::CreateDescriptorAndEffectsUsingPaint(
paint, nullptr, SkScalerContextFlags::kNone, zoomPtr, &ad, &effects);
{
auto typeface = SkPaintPriv::GetTypefaceOrDefault(paint);
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(*desc, effects, *typeface);
*metrics = cache->getFontMetrics();
}
if (scale) {
SkPaintPriv::ScaleFontMetrics(metrics, scale);
}
return metrics->fDescent - metrics->fAscent + metrics->fLeading;
}
///////////////////////////////////////////////////////////////////////////////
static void set_bounds(const SkGlyph& g, SkRect* bounds, SkScalar scale) {
bounds->set(g.fLeft * scale,
g.fTop * scale,
(g.fLeft + g.fWidth) * scale,
(g.fTop + g.fHeight) * scale);
}
int SkPaint::getTextWidths(const void* textData, size_t byteLength,
SkScalar widths[], SkRect bounds[]) const {
if (0 == byteLength) {
return 0;
}
SkASSERT(textData);
if (nullptr == widths && nullptr == bounds) {
return this->countText(textData, byteLength);
}
SkCanonicalizePaint canon(*this);
const SkPaint& paint = canon.getPaint();
SkScalar scale = canon.getScale();
auto cache = SkStrikeCache::FindOrCreateStrikeExclusive(paint);
GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
nullptr != bounds);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
int count = 0;
const int xyIndex = paint.isVerticalText() ? 1 : 0;
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text);
if (widths) {
*widths++ = advance(g, xyIndex) * scale;
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache.get(), &text);
if (widths) {
*widths++ = advance(g, xyIndex);
}
if (bounds) {
set_bounds(g, bounds++);
}
++count;
}
}
SkASSERT(text == stop);
return count;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkDraw.h"
void SkPaint::getTextPath(const void* textData, size_t length,
SkScalar x, SkScalar y, SkPath* path) const {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkScalar prevXPos = 0;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
path->reset();
SkScalar xpos;
const SkPath* iterPath;
while (iter.next(&iterPath, &xpos)) {
matrix.postTranslate(xpos - prevXPos, 0);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevXPos = xpos;
}
}
void SkPaint::getPosTextPath(const void* textData, size_t length,
const SkPoint pos[], SkPath* path) const {
SkASSERT(length == 0 || textData != nullptr);
const char* text = (const char*)textData;
if (text == nullptr || length == 0 || path == nullptr) {
return;
}
SkTextToPathIter iter(text, length, *this, false);
SkMatrix matrix;
SkPoint prevPos;
prevPos.set(0, 0);
matrix.setScale(iter.getPathScale(), iter.getPathScale());
path->reset();
unsigned int i = 0;
const SkPath* iterPath;
while (iter.next(&iterPath, nullptr)) {
matrix.postTranslate(pos[i].fX - prevPos.fX, pos[i].fY - prevPos.fY);
if (iterPath) {
path->addPath(*iterPath, matrix);
}
prevPos = pos[i];
i++;
}
}
template <SkTextInterceptsIter::TextType TextType, typename Func>
int GetTextIntercepts(const SkPaint& paint, const void* text, size_t length,
const SkScalar bounds[2], SkScalar* array, Func posMaker) {
SkASSERT(length == 0 || text != nullptr);
if (!length) {
return 0;
}
const SkPoint pos0 = posMaker(0);
SkTextInterceptsIter iter(static_cast<const char*>(text), length, paint, bounds,
pos0.x(), pos0.y(), TextType);
int i = 0;
int count = 0;
while (iter.next(array, &count)) {
if (TextType == SkTextInterceptsIter::TextType::kPosText) {
const SkPoint pos = posMaker(++i);
iter.setPosition(pos.x(), pos.y());
}
}
return count;
}
int SkPaint::getTextIntercepts(const void* textData, size_t length,
SkScalar x, SkScalar y, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kText>(
*this, textData, length, bounds, array, [&x, &y] (int) -> SkPoint {
return SkPoint::Make(x, y);
});
}
int SkPaint::getPosTextIntercepts(const void* textData, size_t length, const SkPoint pos[],
const SkScalar bounds[2], SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&pos] (int i) -> SkPoint {
return pos[i];
});
}
int SkPaint::getPosTextHIntercepts(const void* textData, size_t length, const SkScalar xpos[],
SkScalar constY, const SkScalar bounds[2],
SkScalar* array) const {
return GetTextIntercepts<SkTextInterceptsIter::TextType::kPosText>(
*this, textData, length, bounds, array, [&xpos, &constY] (int i) -> SkPoint {
return SkPoint::Make(xpos[i], constY);
});
}
int SkPaint::getTextBlobIntercepts(const SkTextBlob* blob, const SkScalar bounds[2],
SkScalar* intervals) const {
int count = 0;
SkPaint runPaint(*this);
SkTextBlobRunIterator it(blob);
while (!it.done()) {
it.applyFontToPaint(&runPaint);
const size_t runByteCount = it.glyphCount() * sizeof(SkGlyphID);
SkScalar* runIntervals = intervals ? intervals + count : nullptr;
switch (it.positioning()) {
case SkTextBlob::kDefault_Positioning:
count += runPaint.getTextIntercepts(it.glyphs(), runByteCount, it.offset().x(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlob::kHorizontal_Positioning:
count += runPaint.getPosTextHIntercepts(it.glyphs(), runByteCount, it.pos(),
it.offset().y(), bounds, runIntervals);
break;
case SkTextBlob::kFull_Positioning:
count += runPaint.getPosTextIntercepts(it.glyphs(), runByteCount,
reinterpret_cast<const SkPoint*>(it.pos()),
bounds, runIntervals);
break;
}
it.next();
}
return count;
}
SkRect SkPaint::getFontBounds() const {
SkMatrix m;
m.setScale(fTextSize * fTextScaleX, fTextSize);
m.postSkew(fTextSkewX, 0);
SkTypeface* typeface = SkPaintPriv::GetTypefaceOrDefault(*this);
SkRect bounds;
m.mapRect(&bounds, typeface->getBounds());
return bounds;
}
// return true if the paint is just a single color (i.e. not a shader). If its
// a shader, then we can't compute a const luminance for it :(
static bool just_a_color(const SkPaint& paint, SkColor* color) {
SkColor c = paint.getColor();
const auto* shader = as_SB(paint.getShader());
if (shader && !shader->asLuminanceColor(&c)) {
return false;
}
if (paint.getColorFilter()) {
c = paint.getColorFilter()->filterColor(c);
}
if (color) {
*color = c;
}
return true;
}
SkColor SkPaint::computeLuminanceColor() const {
SkColor c;
if (!just_a_color(*this, &c)) {
c = SkColorSetRGB(0x7F, 0x80, 0x7F);
}
return c;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStream.h"
static uintptr_t asint(const void* p) {
return reinterpret_cast<uintptr_t>(p);
}
static uint32_t pack_4(unsigned a, unsigned b, unsigned c, unsigned d) {
SkASSERT(a == (uint8_t)a);
SkASSERT(b == (uint8_t)b);
SkASSERT(c == (uint8_t)c);
SkASSERT(d == (uint8_t)d);
return (a << 24) | (b << 16) | (c << 8) | d;
}
#ifdef SK_DEBUG
static void ASSERT_FITS_IN(uint32_t value, int bitCount) {
SkASSERT(bitCount > 0 && bitCount <= 32);
uint32_t mask = ~0U;
mask >>= (32 - bitCount);
SkASSERT(0 == (value & ~mask));
}
#else
#define ASSERT_FITS_IN(value, bitcount)
#endif
enum FlatFlags {
kHasTypeface_FlatFlag = 0x1,
kHasEffects_FlatFlag = 0x2,
kFlatFlagMask = 0x3,
};
enum BitsPerField {
kFlags_BPF = 16,
kHint_BPF = 2,
kAlign_BPF = 2,
kFilter_BPF = 2,
kFlatFlags_BPF = 3,
};
static inline int BPF_Mask(int bits) {
return (1 << bits) - 1;
}
static uint32_t pack_paint_flags(unsigned flags, unsigned hint, unsigned align,
unsigned filter, unsigned flatFlags) {
ASSERT_FITS_IN(flags, kFlags_BPF);
ASSERT_FITS_IN(hint, kHint_BPF);
ASSERT_FITS_IN(align, kAlign_BPF);
ASSERT_FITS_IN(filter, kFilter_BPF);
ASSERT_FITS_IN(flatFlags, kFlatFlags_BPF);
// left-align the fields of "known" size, and right-align the last (flatFlags) so it can easly
// add more bits in the future.
return (flags << 16) | (hint << 14) | (align << 12) | (filter << 10) | flatFlags;
}
static FlatFlags unpack_paint_flags(SkPaint* paint, uint32_t packed) {
paint->setFlags(packed >> 16);
paint->setHinting((SkPaint::Hinting)((packed >> 14) & BPF_Mask(kHint_BPF)));
paint->setTextAlign((SkPaint::Align)((packed >> 12) & BPF_Mask(kAlign_BPF)));
paint->setFilterQuality((SkFilterQuality)((packed >> 10) & BPF_Mask(kFilter_BPF)));
return (FlatFlags)(packed & kFlatFlagMask);
}
/* To save space/time, we analyze the paint, and write a truncated version of
it if there are not tricky elements like shaders, etc.
*/
void SkPaintPriv::Flatten(const SkPaint& paint, SkWriteBuffer& buffer) {
// We force recording our typeface, even if its "default" since the receiver process
// may have a different notion of default.
SkTypeface* tf = SkPaintPriv::GetTypefaceOrDefault(paint);
SkASSERT(tf);
uint8_t flatFlags = kHasTypeface_FlatFlag;
if (asint(paint.getPathEffect()) |
asint(paint.getShader()) |
asint(paint.getMaskFilter()) |
asint(paint.getColorFilter()) |
asint(paint.getLooper()) |
asint(paint.getImageFilter())) {
flatFlags |= kHasEffects_FlatFlag;
}
buffer.writeScalar(paint.getTextSize());
buffer.writeScalar(paint.getTextScaleX());
buffer.writeScalar(paint.getTextSkewX());
buffer.writeScalar(paint.getStrokeWidth());
buffer.writeScalar(paint.getStrokeMiter());
buffer.writeColor(paint.getColor());
buffer.writeUInt(pack_paint_flags(paint.getFlags(), paint.getHinting(), paint.getTextAlign(),
paint.getFilterQuality(), flatFlags));
buffer.writeUInt(pack_4(paint.getStrokeCap(), paint.getStrokeJoin(),
(paint.getStyle() << 4) | paint.getTextEncoding(),
paint.fBlendMode));
buffer.writeTypeface(tf);
if (flatFlags & kHasEffects_FlatFlag) {
buffer.writeFlattenable(paint.getPathEffect());
buffer.writeFlattenable(paint.getShader());
buffer.writeFlattenable(paint.getMaskFilter());
buffer.writeFlattenable(paint.getColorFilter());
buffer.write32(0); // use to be SkRasterizer
buffer.writeFlattenable(paint.getLooper());
buffer.writeFlattenable(paint.getImageFilter());
}
}
bool SkPaintPriv::Unflatten(SkPaint* paint, SkReadBuffer& buffer) {
SkSafeRange safe;
paint->setTextSize(buffer.readScalar());
paint->setTextScaleX(buffer.readScalar());
paint->setTextSkewX(buffer.readScalar());
paint->setStrokeWidth(buffer.readScalar());
paint->setStrokeMiter(buffer.readScalar());
paint->setColor(buffer.readColor());
unsigned flatFlags = unpack_paint_flags(paint, buffer.readUInt());
uint32_t tmp = buffer.readUInt();
paint->setStrokeCap(safe.checkLE((tmp >> 24) & 0xFF, SkPaint::kLast_Cap));
paint->setStrokeJoin(safe.checkLE((tmp >> 16) & 0xFF, SkPaint::kLast_Join));
paint->setStyle(safe.checkLE((tmp >> 12) & 0xF, SkPaint::kStrokeAndFill_Style));
paint->setTextEncoding(safe.checkLE((tmp >> 8) & 0xF, SkPaint::kGlyphID_TextEncoding));
paint->setBlendMode(safe.checkLE(tmp & 0xFF, SkBlendMode::kLastMode));
if (flatFlags & kHasTypeface_FlatFlag) {
paint->setTypeface(buffer.readTypeface());
} else {
paint->setTypeface(nullptr);
}
if (flatFlags & kHasEffects_FlatFlag) {
paint->setPathEffect(buffer.readPathEffect());
paint->setShader(buffer.readShader());
paint->setMaskFilter(buffer.readMaskFilter());
paint->setColorFilter(buffer.readColorFilter());
(void)buffer.read32(); // use to be SkRasterizer
paint->setLooper(buffer.readDrawLooper());
paint->setImageFilter(buffer.readImageFilter());
} else {
paint->setPathEffect(nullptr);
paint->setShader(nullptr);
paint->setMaskFilter(nullptr);
paint->setColorFilter(nullptr);
paint->setLooper(nullptr);
paint->setImageFilter(nullptr);
}
if (!buffer.validate(safe)) {
paint->reset();
return false;
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
bool SkPaint::getFillPath(const SkPath& src, SkPath* dst, const SkRect* cullRect,
SkScalar resScale) const {
if (!src.isFinite()) {
dst->reset();
return false;
}
SkStrokeRec rec(*this, resScale);
const SkPath* srcPtr = &src;
SkPath tmpPath;
if (fPathEffect && fPathEffect->filterPath(&tmpPath, src, &rec, cullRect)) {
srcPtr = &tmpPath;
}
if (!rec.applyToPath(dst, *srcPtr)) {
if (srcPtr == &tmpPath) {
// If path's were copy-on-write, this trick would not be needed.
// As it is, we want to save making a deep-copy from tmpPath -> dst
// since we know we're just going to delete tmpPath when we return,
// so the swap saves that copy.
dst->swap(tmpPath);
} else {
*dst = *srcPtr;
}
}
if (!dst->isFinite()) {
dst->reset();
return false;
}
return !rec.isHairlineStyle();
}
bool SkPaint::canComputeFastBounds() const {
if (this->getLooper()) {
return this->getLooper()->canComputeFastBounds(*this);
}
if (this->getImageFilter() && !this->getImageFilter()->canComputeFastBounds()) {
return false;
}
return true;
}
const SkRect& SkPaint::doComputeFastBounds(const SkRect& origSrc,
SkRect* storage,
Style style) const {
SkASSERT(storage);
const SkRect* src = &origSrc;
if (this->getLooper()) {
SkASSERT(this->getLooper()->canComputeFastBounds(*this));
this->getLooper()->computeFastBounds(*this, *src, storage);
return *storage;
}
SkRect tmpSrc;
if (this->getPathEffect()) {
this->getPathEffect()->computeFastBounds(&tmpSrc, origSrc);
src = &tmpSrc;
}
SkScalar radius = SkStrokeRec::GetInflationRadius(*this, style);
*storage = src->makeOutset(radius, radius);
if (this->getMaskFilter()) {
as_MFB(this->getMaskFilter())->computeFastBounds(*storage, storage);
}
if (this->getImageFilter()) {
*storage = this->getImageFilter()->computeFastBounds(*storage);
}
return *storage;
}
///////////////////////////////////////////////////////////////////////////////
static bool has_thick_frame(const SkPaint& paint) {
return paint.getStrokeWidth() > 0 &&
paint.getStyle() != SkPaint::kFill_Style;
}
SkTextBaseIter::SkTextBaseIter(const char text[], size_t length,
const SkPaint& paint,
bool applyStrokeAndPathEffects)
: fPaint(paint) {
fGlyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(), true);
fPaint.setLinearText(true);
fPaint.setMaskFilter(nullptr); // don't want this affecting our path-cache lookup
if (fPaint.getPathEffect() == nullptr && !has_thick_frame(fPaint)) {
applyStrokeAndPathEffects = false;
}
// can't use our canonical size if we need to apply patheffects
if (fPaint.getPathEffect() == nullptr) {
fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
// Note: fScale can be zero here (even if it wasn't before the divide). It can also
// be very very small. We call sk_ieee_float_divide below to ensure IEEE divide behavior,
// since downstream we will check for the resulting coordinates being non-finite anyway.
// Thus we don't need to check for zero here.
if (has_thick_frame(fPaint)) {
fPaint.setStrokeWidth(sk_ieee_float_divide(fPaint.getStrokeWidth(), fScale));
}
} else {
fScale = SK_Scalar1;
}
if (!applyStrokeAndPathEffects) {
fPaint.setStyle(SkPaint::kFill_Style);
fPaint.setPathEffect(nullptr);
}
// SRGBTODO: Is this correct?
fCache = SkStrikeCache::FindOrCreateStrikeExclusive(
fPaint, nullptr,
SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr);
SkPaint::Style style = SkPaint::kFill_Style;
sk_sp<SkPathEffect> pe;
if (!applyStrokeAndPathEffects) {
style = paint.getStyle(); // restore
pe = paint.refPathEffect(); // restore
}
fPaint.setStyle(style);
fPaint.setPathEffect(pe);
fPaint.setMaskFilter(paint.refMaskFilter()); // restore
// now compute fXOffset if needed
SkScalar xOffset = 0;
if (paint.getTextAlign() != SkPaint::kLeft_Align) { // need to measure first
int count;
SkScalar width = fPaint.measure_text(fCache.get(), text, length, &count, nullptr) * fScale;
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
width = SkScalarHalf(width);
}
xOffset = -width;
}
fXPos = xOffset;
fPrevAdvance = 0;
fText = text;
fStop = text + length;
fXYIndex = paint.isVerticalText() ? 1 : 0;
}
bool SkTextToPathIter::next(const SkPath** path, SkScalar* xpos) {
if (fText < fStop) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (glyph.fWidth) {
if (path) {
*path = fCache->findPath(glyph);
}
} else {
if (path) {
*path = nullptr;
}
}
if (xpos) {
*xpos = fXPos;
}
return true;
}
return false;
}
bool SkTextInterceptsIter::next(SkScalar* array, int* count) {
const SkGlyph& glyph = fGlyphCacheProc(fCache.get(), &fText);
fXPos += fPrevAdvance * fScale;
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (fCache->findPath(glyph)) {
fCache->findIntercepts(fBounds, fScale, fXPos, SkToBool(fXYIndex),
const_cast<SkGlyph*>(&glyph), array, count);
}
return fText < fStop;
}
///////////////////////////////////////////////////////////////////////////////
// return true if the filter exists, and may affect alpha
static bool affects_alpha(const SkColorFilter* cf) {
return cf && !(cf->getFlags() & SkColorFilter::kAlphaUnchanged_Flag);
}
// return true if the filter exists, and may affect alpha
static bool affects_alpha(const SkImageFilter* imf) {
// TODO: check if we should allow imagefilters to broadcast that they don't affect alpha
// ala colorfilters
return imf != nullptr;
}
bool SkPaint::nothingToDraw() const {
if (fDrawLooper) {
return false;
}
switch ((SkBlendMode)fBlendMode) {
case SkBlendMode::kSrcOver:
case SkBlendMode::kSrcATop:
case SkBlendMode::kDstOut:
case SkBlendMode::kDstOver:
case SkBlendMode::kPlus:
if (0 == this->getAlpha()) {
return !affects_alpha(fColorFilter.get()) && !affects_alpha(fImageFilter.get());
}
break;
case SkBlendMode::kDst:
return true;
default:
break;
}
return false;
}
uint32_t SkPaint::getHash() const {
// We're going to hash 7 pointers and 7 32-bit values, finishing up with fBitfields,
// so fBitfields should be 7 pointers and 6 32-bit values from the start.
static_assert(offsetof(SkPaint, fBitfields) == 7 * sizeof(void*) + 7 * sizeof(uint32_t),
"SkPaint_notPackedTightly");
return SkOpts::hash(reinterpret_cast<const uint32_t*>(this),
offsetof(SkPaint, fBitfields) + sizeof(fBitfields));
}