/* * 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 "SkAutoKern.h" #include "SkColorFilter.h" #include "SkData.h" #include "SkDraw.h" #include "SkFontDescriptor.h" #include "SkGlyphCache.h" #include "SkImageFilter.h" #include "SkMaskFilter.h" #include "SkMaskGamma.h" #include "SkMutex.h" #include "SkReadBuffer.h" #include "SkWriteBuffer.h" #include "SkOpts.h" #include "SkPaintDefaults.h" #include "SkPathEffect.h" #include "SkRasterizer.h" #include "SkScalar.h" #include "SkScalerContext.h" #include "SkShader.h" #include "SkStringUtils.h" #include "SkStroke.h" #include "SkStrokeRec.h" #include "SkSurfacePriv.h" #include "SkTextBlob.h" #include "SkTextBlobRunIterator.h" #include "SkTextFormatParams.h" #include "SkTextToPathIter.h" #include "SkTLazy.h" #include "SkTypeface.h" #include "SkXfermode.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(fRasterizer) , 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(fRasterizer); 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(fRasterizer); 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(fRasterizer); 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(fRasterizer) && EQUAL(fDrawLooper) && EQUAL(fImageFilter) && EQUAL(fTextSize) && EQUAL(fTextScaleX) && EQUAL(fTextSkewX) && EQUAL(fColor) && EQUAL(fWidth) && EQUAL(fMiterLimit) && EQUAL(fBlendMode) && EQUAL(fBitfieldsUInt) ; #undef EQUAL } 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::setUnderlineText(bool doUnderline) { this->setFlags(set_clear_mask(fBitfields.fFlags, doUnderline, kUnderlineText_Flag)); } void SkPaint::setStrikeThruText(bool doStrikeThru) { this->setFlags(set_clear_mask(fBitfields.fFlags, doStrikeThru, kStrikeThruText_Flag)); } void SkPaint::setFakeBoldText(bool doFakeBold) { this->setFlags(set_clear_mask(fBitfields.fFlags, doFakeBold, kFakeBoldText_Flag)); } void SkPaint::setDevKernText(bool doDevKern) { this->setFlags(set_clear_mask(fBitfields.fFlags, doDevKern, kDevKernText_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 f) { f##Field = std::move(f); } MOVE_FIELD(Typeface) MOVE_FIELD(Rasterizer) 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 looper) { fDrawLooper = std::move(looper); } #define SET_PTR(Field) \ Sk##Field* SkPaint::set##Field(Sk##Field* f) { \ this->f##Field.reset(SkSafeRef(f)); \ return f; \ } #ifdef SK_SUPPORT_LEGACY_TYPEFACE_PTR SET_PTR(Typeface) #endif #ifdef SK_SUPPORT_LEGACY_MINOR_EFFECT_PTR SET_PTR(Rasterizer) #endif SET_PTR(ImageFilter) #ifdef SK_SUPPORT_LEGACY_CREATESHADER_PTR SET_PTR(Shader) #endif #ifdef SK_SUPPORT_LEGACY_COLORFILTER_PTR SET_PTR(ColorFilter) #endif #ifdef SK_SUPPORT_LEGACY_PATHEFFECT_PTR SET_PTR(PathEffect) #endif #ifdef SK_SUPPORT_LEGACY_MASKFILTER_PTR SET_PTR(MaskFilter) #endif #undef SET_PTR #ifdef SK_SUPPORT_LEGACY_MINOR_EFFECT_PTR SkDrawLooper* SkPaint::setLooper(SkDrawLooper* looper) { fDrawLooper.reset(SkSafeRef(looper)); return looper; } #endif #ifdef SK_SUPPORT_LEGACY_XFERMODE_OBJECT void SkPaint::setXfermode(sk_sp mode) { this->setBlendMode(mode ? mode->blend() : SkBlendMode::kSrcOver); } SkXfermode* SkPaint::getXfermode() const { return SkXfermode::Peek((SkBlendMode)fBlendMode); } SkXfermode* SkPaint::setXfermodeMode(SkXfermode::Mode mode) { this->setBlendMode((SkBlendMode)mode); return SkXfermode::Peek((SkBlendMode)mode); } #endif /////////////////////////////////////////////////////////////////////////////// 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) { SkASSERT(!ctm.hasPerspective()); SkASSERT(!textM.hasPerspective()); SkMatrix matrix; matrix.setConcat(ctm, textM); return tooBig(matrix, MaxCacheSize2()); } /////////////////////////////////////////////////////////////////////////////// #include "SkGlyphCache.h" #include "SkUtils.h" static void DetachDescProc(SkTypeface* typeface, const SkScalerContextEffects& effects, const SkDescriptor* desc, void* context) { *((SkGlyphCache**)context) = SkGlyphCache::DetachCache(typeface, effects, desc); } int SkPaint::textToGlyphs(const void* textData, size_t byteLength, uint16_t glyphs[]) const { if (byteLength == 0) { return 0; } SkASSERT(textData != nullptr); if (nullptr == glyphs) { switch (this->getTextEncoding()) { case kUTF8_TextEncoding: return SkUTF8_CountUnichars((const char*)textData, byteLength); case kUTF16_TextEncoding: return SkUTF16_CountUnichars((const uint16_t*)textData, SkToInt(byteLength >> 1)); case kUTF32_TextEncoding: return SkToInt(byteLength >> 2); case kGlyphID_TextEncoding: return SkToInt(byteLength >> 1); default: SkDEBUGFAIL("unknown text encoding"); } return 0; } // 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); } SkAutoGlyphCache autoCache(*this, nullptr, nullptr); SkGlyphCache* cache = autoCache.getCache(); 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) { *gptr++ = cache->unicharToGlyph(SkUTF8_NextUnichar(&text)); } 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(textData); size_t count = byteLength >> 1; for (size_t i = 0; i < count; i++) { if (0 == glyphID[i]) { return false; } } return true; } SkAutoGlyphCache autoCache(*this, nullptr, nullptr); SkGlyphCache* cache = autoCache.getCache(); switch (this->getTextEncoding()) { case SkPaint::kUTF8_TextEncoding: { const char* text = static_cast(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(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(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); SkAutoGlyphCache autoCache(*this, &props, nullptr); SkGlyphCache* cache = autoCache.getCache(); 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 isDevKern, 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 && !isDevKern) { index += 4; } SkASSERT(index < SK_ARRAY_COUNT(gGlyphCacheProcs)); return gGlyphCacheProcs[index]; } /////////////////////////////////////////////////////////////////////////////// #define TEXT_AS_PATHS_PAINT_FLAGS_TO_IGNORE ( \ SkPaint::kDevKernText_Flag | \ SkPaint::kLinearText_Flag | \ SkPaint::kLCDRenderText_Flag | \ SkPaint::kEmbeddedBitmapText_Flag | \ SkPaint::kAutoHinting_Flag | \ SkPaint::kGenA8FromLCD_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 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(), this->isDevKernText(), 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) { if (this->isDevKernText()) { for (; text < stop; n++) { const int rsb = g->fRsbDelta; g = &glyphCacheProc(cache, &text); x += SkAutoKern_Adjust(rsb, g->fLsbDelta) + advance(*g, xyIndex); } } else { for (; text < stop; n++) { x += advance(glyphCacheProc(cache, &text), xyIndex); } } } else { set_bounds(*g, bounds); if (this->isDevKernText()) { for (; text < stop; n++) { const int rsb = g->fRsbDelta; g = &glyphCacheProc(cache, &text); x += SkAutoKern_Adjust(rsb, g->fLsbDelta); joinBoundsProc(*g, bounds, x); x += advance(*g, xyIndex); } } else { 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(); SkAutoGlyphCache autoCache(paint, nullptr, nullptr); SkGlyphCache* cache = autoCache.getCache(); SkScalar width = 0; if (length > 0) { int tempCount; width = paint.measure_text(cache, text, length, &tempCount, bounds); if (scale) { width = SkScalarMul(width, scale); if (bounds) { bounds->fLeft = SkScalarMul(bounds->fLeft, scale); bounds->fTop = SkScalarMul(bounds->fTop, scale); bounds->fRight = SkScalarMul(bounds->fRight, scale); bounds->fBottom = SkScalarMul(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; } SkAutoGlyphCache autoCache(paint, nullptr, nullptr); SkGlyphCache* cache = autoCache.getCache(); GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(), paint.isDevKernText(), false); const int xyIndex = paint.isVerticalText() ? 1 : 0; SkScalar width = 0; if (this->isDevKernText()) { int rsb = 0; while (text < stop) { const char* curr = text; const SkGlyph& g = glyphCacheProc(cache, &text); SkScalar x = SkAutoKern_Adjust(rsb, g.fLsbDelta) + advance(g, xyIndex); if ((width += x) > maxWidth) { width -= x; text = curr; break; } rsb = g.fRsbDelta; } } else { while (text < stop) { const char* curr = text; SkScalar x = advance(glyphCacheProc(cache, &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; } /////////////////////////////////////////////////////////////////////////////// static bool FontMetricsCacheProc(const SkGlyphCache* cache, void* context) { *(SkPaint::FontMetrics*)context = cache->getFontMetrics(); return false; // don't detach the cache } static void FontMetricsDescProc(SkTypeface* typeface, const SkScalerContextEffects& effects, const SkDescriptor* desc, void* context) { SkGlyphCache::VisitCache(typeface, effects, desc, FontMetricsCacheProc, context); } 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; } paint.descriptorProc(nullptr, kNone_ScalerContextFlags, zoomPtr, FontMetricsDescProc, metrics); if (scale) { metrics->fTop = SkScalarMul(metrics->fTop, scale); metrics->fAscent = SkScalarMul(metrics->fAscent, scale); metrics->fDescent = SkScalarMul(metrics->fDescent, scale); metrics->fBottom = SkScalarMul(metrics->fBottom, scale); metrics->fLeading = SkScalarMul(metrics->fLeading, scale); metrics->fAvgCharWidth = SkScalarMul(metrics->fAvgCharWidth, scale); metrics->fXMin = SkScalarMul(metrics->fXMin, scale); metrics->fXMax = SkScalarMul(metrics->fXMax, scale); metrics->fXHeight = SkScalarMul(metrics->fXHeight, scale); metrics->fUnderlineThickness = SkScalarMul(metrics->fUnderlineThickness, scale); metrics->fUnderlinePosition = SkScalarMul(metrics->fUnderlinePosition, 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(); SkAutoGlyphCache autoCache(paint, nullptr, nullptr); SkGlyphCache* cache = autoCache.getCache(); GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(), paint.isDevKernText(), nullptr != bounds); const char* text = (const char*)textData; const char* stop = text + byteLength; int count = 0; const int xyIndex = paint.isVerticalText() ? 1 : 0; if (this->isDevKernText()) { // we adjust the widths returned here through auto-kerning SkAutoKern autokern; SkScalar prevWidth = 0; if (scale) { while (text < stop) { const SkGlyph& g = glyphCacheProc(cache, &text); if (widths) { SkScalar adjust = autokern.adjust(g); if (count > 0) { *widths++ = SkScalarMul(prevWidth + adjust, scale); } prevWidth = advance(g, xyIndex); } if (bounds) { set_bounds(g, bounds++, scale); } ++count; } if (count > 0 && widths) { *widths = SkScalarMul(prevWidth, scale); } } else { while (text < stop) { const SkGlyph& g = glyphCacheProc(cache, &text); if (widths) { SkScalar adjust = autokern.adjust(g); if (count > 0) { *widths++ = prevWidth + adjust; } prevWidth = advance(g, xyIndex); } if (bounds) { set_bounds(g, bounds++); } ++count; } if (count > 0 && widths) { *widths = prevWidth; } } } else { // no devkern if (scale) { while (text < stop) { const SkGlyph& g = glyphCacheProc(cache, &text); if (widths) { *widths++ = SkScalarMul(advance(g, xyIndex), scale); } if (bounds) { set_bounds(g, bounds++, scale); } ++count; } } else { while (text < stop) { const SkGlyph& g = glyphCacheProc(cache, &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 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(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( *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( *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( *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(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 = this->getTypeface(); if (nullptr == typeface) { typeface = SkTypeface::GetDefaultTypeface(); } SkRect bounds; m.mapRect(&bounds, typeface->getBounds()); return bounds; } static void add_flattenable(SkDescriptor* desc, uint32_t tag, SkBinaryWriteBuffer* buffer) { buffer->writeToMemory(desc->addEntry(tag, buffer->bytesWritten(), nullptr)); } static SkMask::Format compute_mask_format(const SkPaint& paint) { uint32_t flags = paint.getFlags(); // Antialiasing being disabled trumps all other settings. if (!(flags & SkPaint::kAntiAlias_Flag)) { return SkMask::kBW_Format; } if (flags & SkPaint::kLCDRenderText_Flag) { return SkMask::kLCD16_Format; } return SkMask::kA8_Format; } // if linear-text is on, then we force hinting to be off (since that's sort of // the point of linear-text. static SkPaint::Hinting computeHinting(const SkPaint& paint) { SkPaint::Hinting h = paint.getHinting(); if (paint.isLinearText()) { h = SkPaint::kNo_Hinting; } return h; } // 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 justAColor(const SkPaint& paint, SkColor* color) { SkColor c = paint.getColor(); SkShader* shader = 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 (!justAColor(*this, &c)) { c = SkColorSetRGB(0x7F, 0x80, 0x7F); } return c; } #define assert_byte(x) SkASSERT(0 == ((x) >> 8)) // Beyond this size, LCD doesn't appreciably improve quality, but it always // cost more RAM and draws slower, so we set a cap. #ifndef SK_MAX_SIZE_FOR_LCDTEXT #define SK_MAX_SIZE_FOR_LCDTEXT 48 #endif const SkScalar gMaxSize2ForLCDText = SK_MAX_SIZE_FOR_LCDTEXT * SK_MAX_SIZE_FOR_LCDTEXT; static bool too_big_for_lcd(const SkScalerContext::Rec& rec, bool checkPost2x2) { if (checkPost2x2) { SkScalar area = rec.fPost2x2[0][0] * rec.fPost2x2[1][1] - rec.fPost2x2[1][0] * rec.fPost2x2[0][1]; area *= rec.fTextSize * rec.fTextSize; return area > gMaxSize2ForLCDText; } else { return rec.fTextSize > SK_MAX_SIZE_FOR_LCDTEXT; } } /* * Return the scalar with only limited fractional precision. Used to consolidate matrices * that vary only slightly when we create our key into the font cache, since the font scaler * typically returns the same looking resuts for tiny changes in the matrix. */ static SkScalar sk_relax(SkScalar x) { SkScalar n = SkScalarRoundToScalar(x * 1024); return n / 1024.0f; } void SkScalerContext::MakeRec(const SkPaint& paint, const SkSurfaceProps* surfaceProps, const SkMatrix* deviceMatrix, Rec* rec) { SkASSERT(deviceMatrix == nullptr || !deviceMatrix->hasPerspective()); SkTypeface* typeface = paint.getTypeface(); if (nullptr == typeface) { typeface = SkTypeface::GetDefaultTypeface(); } rec->fFontID = typeface->uniqueID(); rec->fTextSize = paint.getTextSize(); rec->fPreScaleX = paint.getTextScaleX(); rec->fPreSkewX = paint.getTextSkewX(); bool checkPost2x2 = false; if (deviceMatrix) { const SkMatrix::TypeMask mask = deviceMatrix->getType(); if (mask & SkMatrix::kScale_Mask) { rec->fPost2x2[0][0] = sk_relax(deviceMatrix->getScaleX()); rec->fPost2x2[1][1] = sk_relax(deviceMatrix->getScaleY()); checkPost2x2 = true; } else { rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1; } if (mask & SkMatrix::kAffine_Mask) { rec->fPost2x2[0][1] = sk_relax(deviceMatrix->getSkewX()); rec->fPost2x2[1][0] = sk_relax(deviceMatrix->getSkewY()); checkPost2x2 = true; } else { rec->fPost2x2[0][1] = rec->fPost2x2[1][0] = 0; } } else { rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1; rec->fPost2x2[0][1] = rec->fPost2x2[1][0] = 0; } SkPaint::Style style = paint.getStyle(); SkScalar strokeWidth = paint.getStrokeWidth(); unsigned flags = 0; if (paint.isFakeBoldText()) { #ifdef SK_USE_FREETYPE_EMBOLDEN flags |= SkScalerContext::kEmbolden_Flag; #else SkScalar fakeBoldScale = SkScalarInterpFunc(paint.getTextSize(), kStdFakeBoldInterpKeys, kStdFakeBoldInterpValues, kStdFakeBoldInterpLength); SkScalar extra = SkScalarMul(paint.getTextSize(), fakeBoldScale); if (style == SkPaint::kFill_Style) { style = SkPaint::kStrokeAndFill_Style; strokeWidth = extra; // ignore paint's strokeWidth if it was "fill" } else { strokeWidth += extra; } #endif } if (paint.isDevKernText()) { flags |= SkScalerContext::kDevKernText_Flag; } if (style != SkPaint::kFill_Style && strokeWidth > 0) { rec->fFrameWidth = strokeWidth; rec->fMiterLimit = paint.getStrokeMiter(); rec->fStrokeJoin = SkToU8(paint.getStrokeJoin()); rec->fStrokeCap = SkToU8(paint.getStrokeCap()); if (style == SkPaint::kStrokeAndFill_Style) { flags |= SkScalerContext::kFrameAndFill_Flag; } } else { rec->fFrameWidth = 0; rec->fMiterLimit = 0; rec->fStrokeJoin = 0; rec->fStrokeCap = 0; } rec->fMaskFormat = SkToU8(compute_mask_format(paint)); if (SkMask::kLCD16_Format == rec->fMaskFormat) { if (too_big_for_lcd(*rec, checkPost2x2)) { rec->fMaskFormat = SkMask::kA8_Format; flags |= SkScalerContext::kGenA8FromLCD_Flag; } else { SkPixelGeometry geometry = surfaceProps ? surfaceProps->pixelGeometry() : SkSurfacePropsDefaultPixelGeometry(); switch (geometry) { case kUnknown_SkPixelGeometry: // eeek, can't support LCD rec->fMaskFormat = SkMask::kA8_Format; flags |= SkScalerContext::kGenA8FromLCD_Flag; break; case kRGB_H_SkPixelGeometry: // our default, do nothing. break; case kBGR_H_SkPixelGeometry: flags |= SkScalerContext::kLCD_BGROrder_Flag; break; case kRGB_V_SkPixelGeometry: flags |= SkScalerContext::kLCD_Vertical_Flag; break; case kBGR_V_SkPixelGeometry: flags |= SkScalerContext::kLCD_Vertical_Flag; flags |= SkScalerContext::kLCD_BGROrder_Flag; break; } } } if (paint.isEmbeddedBitmapText()) { flags |= SkScalerContext::kEmbeddedBitmapText_Flag; } if (paint.isSubpixelText()) { flags |= SkScalerContext::kSubpixelPositioning_Flag; } if (paint.isAutohinted()) { flags |= SkScalerContext::kForceAutohinting_Flag; } if (paint.isVerticalText()) { flags |= SkScalerContext::kVertical_Flag; } if (paint.getFlags() & SkPaint::kGenA8FromLCD_Flag) { flags |= SkScalerContext::kGenA8FromLCD_Flag; } rec->fFlags = SkToU16(flags); // these modify fFlags, so do them after assigning fFlags rec->setHinting(computeHinting(paint)); rec->setLuminanceColor(paint.computeLuminanceColor()); //For now always set the paint gamma equal to the device gamma. //The math in SkMaskGamma can handle them being different, //but it requires superluminous masks when //Ex : deviceGamma(x) < paintGamma(x) and x is sufficiently large. rec->setDeviceGamma(SK_GAMMA_EXPONENT); rec->setPaintGamma(SK_GAMMA_EXPONENT); #ifdef SK_GAMMA_CONTRAST rec->setContrast(SK_GAMMA_CONTRAST); #else /** * A value of 0.5 for SK_GAMMA_CONTRAST appears to be a good compromise. * With lower values small text appears washed out (though correctly so). * With higher values lcd fringing is worse and the smoothing effect of * partial coverage is diminished. */ rec->setContrast(0.5f); #endif rec->fReservedAlign = 0; /* Allow the fonthost to modify our rec before we use it as a key into the cache. This way if we're asking for something that they will ignore, they can modify our rec up front, so we don't create duplicate cache entries. */ typeface->onFilterRec(rec); // be sure to call PostMakeRec(rec) before you actually use it! } /** * In order to call cachedDeviceLuminance, cachedPaintLuminance, or * cachedMaskGamma the caller must hold the gMaskGammaCacheMutex and continue * to hold it until the returned pointer is refed or forgotten. */ SK_DECLARE_STATIC_MUTEX(gMaskGammaCacheMutex); static SkMaskGamma* gLinearMaskGamma = nullptr; static SkMaskGamma* gMaskGamma = nullptr; static SkScalar gContrast = SK_ScalarMin; static SkScalar gPaintGamma = SK_ScalarMin; static SkScalar gDeviceGamma = SK_ScalarMin; /** * The caller must hold the gMaskGammaCacheMutex and continue to hold it until * the returned SkMaskGamma pointer is refed or forgotten. */ static const SkMaskGamma& cachedMaskGamma(SkScalar contrast, SkScalar paintGamma, SkScalar deviceGamma) { gMaskGammaCacheMutex.assertHeld(); if (0 == contrast && SK_Scalar1 == paintGamma && SK_Scalar1 == deviceGamma) { if (nullptr == gLinearMaskGamma) { gLinearMaskGamma = new SkMaskGamma; } return *gLinearMaskGamma; } if (gContrast != contrast || gPaintGamma != paintGamma || gDeviceGamma != deviceGamma) { SkSafeUnref(gMaskGamma); gMaskGamma = new SkMaskGamma(contrast, paintGamma, deviceGamma); gContrast = contrast; gPaintGamma = paintGamma; gDeviceGamma = deviceGamma; } return *gMaskGamma; } /** * We ensure that the rec is self-consistent and efficient (where possible) */ void SkScalerContext::PostMakeRec(const SkPaint&, SkScalerContext::Rec* rec) { /** * If we're asking for A8, we force the colorlum to be gray, since that * limits the number of unique entries, and the scaler will only look at * the lum of one of them. */ switch (rec->fMaskFormat) { case SkMask::kLCD16_Format: { // filter down the luminance color to a finite number of bits SkColor color = rec->getLuminanceColor(); rec->setLuminanceColor(SkMaskGamma::CanonicalColor(color)); break; } case SkMask::kA8_Format: { // filter down the luminance to a single component, since A8 can't // use per-component information SkColor color = rec->getLuminanceColor(); U8CPU lum = SkComputeLuminance(SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)); // reduce to our finite number of bits color = SkColorSetRGB(lum, lum, lum); rec->setLuminanceColor(SkMaskGamma::CanonicalColor(color)); break; } case SkMask::kBW_Format: // No need to differentiate gamma or apply contrast if we're BW rec->ignorePreBlend(); break; } } #define MIN_SIZE_FOR_EFFECT_BUFFER 1024 #ifdef SK_DEBUG #define TEST_DESC #endif static void write_out_descriptor(SkDescriptor* desc, const SkScalerContext::Rec& rec, const SkPathEffect* pe, SkBinaryWriteBuffer* peBuffer, const SkMaskFilter* mf, SkBinaryWriteBuffer* mfBuffer, const SkRasterizer* ra, SkBinaryWriteBuffer* raBuffer, size_t descSize) { desc->init(); desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); if (pe) { add_flattenable(desc, kPathEffect_SkDescriptorTag, peBuffer); } if (mf) { add_flattenable(desc, kMaskFilter_SkDescriptorTag, mfBuffer); } if (ra) { add_flattenable(desc, kRasterizer_SkDescriptorTag, raBuffer); } desc->computeChecksum(); } static size_t fill_out_rec(const SkPaint& paint, SkScalerContext::Rec* rec, const SkSurfaceProps* surfaceProps, bool fakeGamma, bool boostContrast, const SkMatrix* deviceMatrix, const SkPathEffect* pe, SkBinaryWriteBuffer* peBuffer, const SkMaskFilter* mf, SkBinaryWriteBuffer* mfBuffer, const SkRasterizer* ra, SkBinaryWriteBuffer* raBuffer) { SkScalerContext::MakeRec(paint, surfaceProps, deviceMatrix, rec); if (!fakeGamma) { rec->ignoreGamma(); } if (!boostContrast) { rec->setContrast(0); } int entryCount = 1; size_t descSize = sizeof(*rec); if (pe) { pe->flatten(*peBuffer); descSize += peBuffer->bytesWritten(); entryCount += 1; rec->fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion // seems like we could support kLCD as well at this point... } if (mf) { mf->flatten(*mfBuffer); descSize += mfBuffer->bytesWritten(); entryCount += 1; rec->fMaskFormat = SkMask::kA8_Format; // force antialiasing with maskfilters /* Pre-blend is not currently applied to filtered text. The primary filter is blur, for which contrast makes no sense, and for which the destination guess error is more visible. Also, all existing users of blur have calibrated for linear. */ rec->ignorePreBlend(); } if (ra) { ra->flatten(*raBuffer); descSize += raBuffer->bytesWritten(); entryCount += 1; rec->fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion } /////////////////////////////////////////////////////////////////////////// // Now that we're done tweaking the rec, call the PostMakeRec cleanup SkScalerContext::PostMakeRec(paint, rec); descSize += SkDescriptor::ComputeOverhead(entryCount); return descSize; } #ifdef TEST_DESC static void test_desc(const SkScalerContext::Rec& rec, const SkPathEffect* pe, SkBinaryWriteBuffer* peBuffer, const SkMaskFilter* mf, SkBinaryWriteBuffer* mfBuffer, const SkRasterizer* ra, SkBinaryWriteBuffer* raBuffer, const SkDescriptor* desc, size_t descSize) { // Check that we completely write the bytes in desc (our key), and that // there are no uninitialized bytes. If there were, then we would get // false-misses (or worse, false-hits) in our fontcache. // // We do this buy filling 2 others, one with 0s and the other with 1s // and create those, and then check that all 3 are identical. SkAutoDescriptor ad1(descSize); SkAutoDescriptor ad2(descSize); SkDescriptor* desc1 = ad1.getDesc(); SkDescriptor* desc2 = ad2.getDesc(); memset(desc1, 0x00, descSize); memset(desc2, 0xFF, descSize); desc1->init(); desc2->init(); desc1->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); desc2->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); if (pe) { add_flattenable(desc1, kPathEffect_SkDescriptorTag, peBuffer); add_flattenable(desc2, kPathEffect_SkDescriptorTag, peBuffer); } if (mf) { add_flattenable(desc1, kMaskFilter_SkDescriptorTag, mfBuffer); add_flattenable(desc2, kMaskFilter_SkDescriptorTag, mfBuffer); } if (ra) { add_flattenable(desc1, kRasterizer_SkDescriptorTag, raBuffer); add_flattenable(desc2, kRasterizer_SkDescriptorTag, raBuffer); } SkASSERT(descSize == desc1->getLength()); SkASSERT(descSize == desc2->getLength()); desc1->computeChecksum(); desc2->computeChecksum(); SkASSERT(!memcmp(desc, desc1, descSize)); SkASSERT(!memcmp(desc, desc2, descSize)); } #endif /* see the note on ignoreGamma on descriptorProc */ void SkPaint::getScalerContextDescriptor(SkScalerContextEffects* effects, SkAutoDescriptor* ad, const SkSurfaceProps& surfaceProps, uint32_t scalerContextFlags, const SkMatrix* deviceMatrix) const { SkScalerContext::Rec rec; SkPathEffect* pe = this->getPathEffect(); SkMaskFilter* mf = this->getMaskFilter(); SkRasterizer* ra = this->getRasterizer(); SkBinaryWriteBuffer peBuffer, mfBuffer, raBuffer; size_t descSize = fill_out_rec(*this, &rec, &surfaceProps, SkToBool(scalerContextFlags & kFakeGamma_ScalerContextFlag), SkToBool(scalerContextFlags & kBoostContrast_ScalerContextFlag), deviceMatrix, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer); ad->reset(descSize); SkDescriptor* desc = ad->getDesc(); write_out_descriptor(desc, rec, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer, descSize); SkASSERT(descSize == desc->getLength()); #ifdef TEST_DESC test_desc(rec, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer, desc, descSize); #endif effects->fPathEffect = pe; effects->fMaskFilter = mf; effects->fRasterizer = ra; } /* * ignoreGamma tells us that the caller just wants metrics that are unaffected * by gamma correction, so we set the rec to ignore preblend: i.e. gamma = 1, * contrast = 0, luminanceColor = transparent black. */ void SkPaint::descriptorProc(const SkSurfaceProps* surfaceProps, uint32_t scalerContextFlags, const SkMatrix* deviceMatrix, void (*proc)(SkTypeface*, const SkScalerContextEffects&, const SkDescriptor*, void*), void* context) const { SkScalerContext::Rec rec; SkPathEffect* pe = this->getPathEffect(); SkMaskFilter* mf = this->getMaskFilter(); SkRasterizer* ra = this->getRasterizer(); SkBinaryWriteBuffer peBuffer, mfBuffer, raBuffer; size_t descSize = fill_out_rec(*this, &rec, surfaceProps, SkToBool(scalerContextFlags & kFakeGamma_ScalerContextFlag), SkToBool(scalerContextFlags & kBoostContrast_ScalerContextFlag), deviceMatrix, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer); SkAutoDescriptor ad(descSize); SkDescriptor* desc = ad.getDesc(); write_out_descriptor(desc, rec, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer, descSize); SkASSERT(descSize == desc->getLength()); #ifdef TEST_DESC test_desc(rec, pe, &peBuffer, mf, &mfBuffer, ra, &raBuffer, desc, descSize); #endif proc(fTypeface.get(), { pe, mf, ra }, desc, context); } SkGlyphCache* SkPaint::detachCache(const SkSurfaceProps* surfaceProps, uint32_t scalerContextFlags, const SkMatrix* deviceMatrix) const { SkGlyphCache* cache; this->descriptorProc(surfaceProps, scalerContextFlags, deviceMatrix, DetachDescProc, &cache); return cache; } /** * Expands fDeviceGamma, fPaintGamma, fContrast, and fLumBits into a mask pre-blend. */ //static SkMaskGamma::PreBlend SkScalerContext::GetMaskPreBlend(const SkScalerContext::Rec& rec) { SkAutoMutexAcquire ama(gMaskGammaCacheMutex); const SkMaskGamma& maskGamma = cachedMaskGamma(rec.getContrast(), rec.getPaintGamma(), rec.getDeviceGamma()); return maskGamma.preBlend(rec.getLuminanceColor()); } size_t SkScalerContext::GetGammaLUTSize(SkScalar contrast, SkScalar paintGamma, SkScalar deviceGamma, int* width, int* height) { SkAutoMutexAcquire ama(gMaskGammaCacheMutex); const SkMaskGamma& maskGamma = cachedMaskGamma(contrast, paintGamma, deviceGamma); maskGamma.getGammaTableDimensions(width, height); size_t size = (*width)*(*height)*sizeof(uint8_t); return size; } void SkScalerContext::GetGammaLUTData(SkScalar contrast, SkScalar paintGamma, SkScalar deviceGamma, void* data) { SkAutoMutexAcquire ama(gMaskGammaCacheMutex); const SkMaskGamma& maskGamma = cachedMaskGamma(contrast, paintGamma, deviceGamma); int width, height; maskGamma.getGammaTableDimensions(&width, &height); size_t size = width*height*sizeof(uint8_t); const uint8_t* gammaTables = maskGamma.getGammaTables(); memcpy(data, gammaTables, size); } /////////////////////////////////////////////////////////////////////////////// #include "SkStream.h" static uintptr_t asint(const void* p) { return reinterpret_cast(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 SkPaint::flatten(SkWriteBuffer& buffer) const { uint8_t flatFlags = 0; if (this->getTypeface()) { flatFlags |= kHasTypeface_FlatFlag; } if (asint(this->getPathEffect()) | asint(this->getShader()) | asint(this->getMaskFilter()) | asint(this->getColorFilter()) | asint(this->getRasterizer()) | asint(this->getLooper()) | asint(this->getImageFilter())) { flatFlags |= kHasEffects_FlatFlag; } buffer.writeScalar(this->getTextSize()); buffer.writeScalar(this->getTextScaleX()); buffer.writeScalar(this->getTextSkewX()); buffer.writeScalar(this->getStrokeWidth()); buffer.writeScalar(this->getStrokeMiter()); buffer.writeColor(this->getColor()); buffer.writeUInt(pack_paint_flags(this->getFlags(), this->getHinting(), this->getTextAlign(), this->getFilterQuality(), flatFlags)); buffer.writeUInt(pack_4(this->getStrokeCap(), this->getStrokeJoin(), (this->getStyle() << 4) | this->getTextEncoding(), fBlendMode)); // now we're done with ptr and the (pre)reserved space. If we need to write // additional fields, use the buffer directly if (flatFlags & kHasTypeface_FlatFlag) { buffer.writeTypeface(this->getTypeface()); } if (flatFlags & kHasEffects_FlatFlag) { buffer.writeFlattenable(this->getPathEffect()); buffer.writeFlattenable(this->getShader()); buffer.writeFlattenable(this->getMaskFilter()); buffer.writeFlattenable(this->getColorFilter()); buffer.writeFlattenable(this->getRasterizer()); buffer.writeFlattenable(this->getLooper()); buffer.writeFlattenable(this->getImageFilter()); } } void SkPaint::unflatten(SkReadBuffer& buffer) { this->setTextSize(buffer.readScalar()); this->setTextScaleX(buffer.readScalar()); this->setTextSkewX(buffer.readScalar()); this->setStrokeWidth(buffer.readScalar()); this->setStrokeMiter(buffer.readScalar()); this->setColor(buffer.readColor()); unsigned flatFlags = unpack_paint_flags(this, buffer.readUInt()); uint32_t tmp = buffer.readUInt(); this->setStrokeCap(static_cast((tmp >> 24) & 0xFF)); this->setStrokeJoin(static_cast((tmp >> 16) & 0xFF)); if (buffer.isVersionLT(SkReadBuffer::kXfermodeToBlendMode_Version)) { this->setStyle(static_cast