| /* |
| * 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 "SkDraw.h" |
| #include "SkFontPriv.h" |
| #include "SkGlyphCache.h" |
| #include "SkPaint.h" |
| #include "SkPath.h" |
| #include "SkScalerContext.h" |
| #include "SkStrikeCache.h" |
| #include "SkTo.h" |
| #include "SkTLazy.h" |
| #include "SkTypeface.h" |
| #include "SkUTF.h" |
| #include "SkUtils.h" |
| |
| #define kDefault_Size 12 |
| #define kDefault_Flags 0 |
| #define kDefault_Edging SkFont::Edging::kAntiAlias |
| #define kDefault_Hinting kNormal_SkFontHinting |
| |
| static inline SkScalar valid_size(SkScalar size) { |
| return SkTMax<SkScalar>(0, size); |
| } |
| |
| SkFont::SkFont(sk_sp<SkTypeface> face, SkScalar size, SkScalar scaleX, SkScalar skewX) |
| : fTypeface(face ? std::move(face) : SkTypeface::MakeDefault()) |
| , fSize(valid_size(size)) |
| , fScaleX(scaleX) |
| , fSkewX(skewX) |
| , fFlags(kDefault_Flags) |
| , fEdging(static_cast<unsigned>(kDefault_Edging)) |
| , fHinting(static_cast<unsigned>(kDefault_Hinting)) |
| {} |
| |
| SkFont::SkFont(sk_sp<SkTypeface> face, SkScalar size) : SkFont(std::move(face), size, 1, 0) {} |
| |
| SkFont::SkFont() : SkFont(nullptr, kDefault_Size) {} |
| |
| bool SkFont::operator==(const SkFont& b) const { |
| return fTypeface.get() == b.fTypeface.get() && |
| fSize == b.fSize && |
| fScaleX == b.fScaleX && |
| fSkewX == b.fSkewX && |
| fFlags == b.fFlags && |
| fEdging == b.fEdging && |
| fHinting == b.fHinting; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static inline uint32_t set_clear_mask(uint32_t bits, bool cond, uint32_t mask) { |
| return cond ? bits | mask : bits & ~mask; |
| } |
| |
| void SkFont::setForceAutoHinting(bool predicate) { |
| fFlags = set_clear_mask(fFlags, predicate, kForceAutoHinting_PrivFlag); |
| } |
| void SkFont::setEmbeddedBitmaps(bool predicate) { |
| fFlags = set_clear_mask(fFlags, predicate, kEmbeddedBitmaps_PrivFlag); |
| } |
| void SkFont::setSubpixel(bool predicate) { |
| fFlags = set_clear_mask(fFlags, predicate, kSubpixel_PrivFlag); |
| } |
| void SkFont::setLinearMetrics(bool predicate) { |
| fFlags = set_clear_mask(fFlags, predicate, kLinearMetrics_PrivFlag); |
| } |
| void SkFont::setEmbolden(bool predicate) { |
| fFlags = set_clear_mask(fFlags, predicate, kEmbolden_PrivFlag); |
| } |
| |
| void SkFont::setEdging(Edging e) { |
| fEdging = SkToU8(e); |
| } |
| |
| void SkFont::setHinting(SkFontHinting h) { |
| fHinting = SkToU8(h); |
| } |
| |
| void SkFont::setSize(SkScalar size) { |
| fSize = valid_size(size); |
| } |
| void SkFont::setScaleX(SkScalar scale) { |
| fScaleX = scale; |
| } |
| void SkFont::setSkewX(SkScalar skew) { |
| fSkewX = skew; |
| } |
| |
| SkFont SkFont::makeWithSize(SkScalar newSize) const { |
| SkFont font = *this; |
| font.setSize(newSize); |
| return font; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkScalar SkFont::setupForAsPaths(SkPaint* paint) { |
| constexpr uint32_t flagsToIgnore = kLinearMetrics_PrivFlag | |
| kEmbeddedBitmaps_PrivFlag | |
| kForceAutoHinting_PrivFlag; |
| |
| fFlags = (fFlags & ~flagsToIgnore) | kSubpixel_PrivFlag; |
| this->setHinting(kNo_SkFontHinting); |
| |
| if (this->getEdging() == Edging::kSubpixelAntiAlias) { |
| this->setEdging(Edging::kAntiAlias); |
| } |
| |
| if (paint) { |
| paint->setStyle(SkPaint::kFill_Style); |
| paint->setPathEffect(nullptr); |
| } |
| SkScalar textSize = fSize; |
| this->setSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths)); |
| return textSize / SkPaint::kCanonicalTextSizeForPaths; |
| } |
| |
| class SkCanonicalizeFont { |
| public: |
| SkCanonicalizeFont(const SkFont& font) : fFont(&font), fScale(0) { |
| if (font.isLinearMetrics() || |
| SkDraw::ShouldDrawTextAsPaths(font, SkPaint(), SkMatrix::I())) |
| { |
| SkFont* f = fLazy.set(font); |
| fScale = f->setupForAsPaths(nullptr); |
| fFont = f; |
| } |
| } |
| |
| const SkFont& getFont() const { return *fFont; } |
| SkScalar getScale() const { return fScale; } |
| |
| private: |
| const SkFont* fFont; |
| SkTLazy<SkFont> fLazy; |
| SkScalar fScale; |
| }; |
| |
| |
| int SkFont::textToGlyphs(const void* text, size_t byteLength, SkTextEncoding encoding, |
| uint16_t glyphs[], int maxGlyphCount) const { |
| if (0 == byteLength) { |
| return 0; |
| } |
| |
| SkASSERT(text); |
| |
| int count = SkFontPriv::CountTextElements(text, byteLength, encoding); |
| if (!glyphs || count > maxGlyphCount) { |
| return count; |
| } |
| |
| // TODO: unify/eliminate SkTypeface::Encoding with SkTextEncoding |
| SkTypeface::Encoding typefaceEncoding; |
| switch (encoding) { |
| case kUTF8_SkTextEncoding: |
| typefaceEncoding = SkTypeface::kUTF8_Encoding; |
| break; |
| case kUTF16_SkTextEncoding: |
| typefaceEncoding = SkTypeface::kUTF16_Encoding; |
| break; |
| case kUTF32_SkTextEncoding: |
| typefaceEncoding = SkTypeface::kUTF32_Encoding; |
| break; |
| default: |
| SkASSERT(kGlyphID_SkTextEncoding == encoding); |
| // we can early exit, since we already have glyphIDs |
| memcpy(glyphs, text, count << 1); |
| return count; |
| } |
| |
| (void)SkFontPriv::GetTypefaceOrDefault(*this)->charsToGlyphs(text, typefaceEncoding, glyphs, |
| count); |
| return count; |
| } |
| |
| void SkFont::glyphsToUnichars(const SkGlyphID glyphs[], int count, SkUnichar text[]) const { |
| if (count <= 0) { |
| return; |
| } |
| |
| auto typeface = SkFontPriv::GetTypefaceOrDefault(*this); |
| const unsigned numGlyphsInTypeface = typeface->countGlyphs(); |
| SkAutoTArray<SkUnichar> unichars(numGlyphsInTypeface); |
| typeface->getGlyphToUnicodeMap(unichars.get()); |
| |
| for (int i = 0; i < count; ++i) { |
| unsigned id = glyphs[i]; |
| text[i] = (id < numGlyphsInTypeface) ? unichars[id] : 0xFFFD; |
| } |
| } |
| |
| static SkTypeface::Encoding to_encoding(SkTextEncoding e) { |
| static_assert((int)SkTypeface::kUTF8_Encoding == (int)kUTF8_SkTextEncoding, ""); |
| static_assert((int)SkTypeface::kUTF16_Encoding == (int)kUTF16_SkTextEncoding, ""); |
| static_assert((int)SkTypeface::kUTF32_Encoding == (int)kUTF32_SkTextEncoding, ""); |
| return (SkTypeface::Encoding)e; |
| } |
| |
| bool SkFont::containsText(const void* textData, size_t byteLength, SkTextEncoding textEnc) const { |
| if (0 == byteLength) { |
| return true; |
| } |
| |
| SkASSERT(textData != nullptr); |
| |
| // handle this encoding before the setup for the glyphcache |
| if (textEnc == kGlyphID_SkTextEncoding) { |
| 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::FindOrCreateStrikeWithNoDeviceExclusive(*this); |
| const void* stop = (const char*)textData + byteLength; |
| const SkTypeface::Encoding encoding = to_encoding(textEnc); |
| while (textData < stop) { |
| if (0 == cache->unicharToGlyph(SkUTFN_Next(encoding, &textData, stop))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| size_t SkFont::breakText(const void* textD, size_t length, SkTextEncoding encoding, |
| SkScalar maxWidth, SkScalar* measuredWidth) const { |
| if (0 == length || !(maxWidth > 0)) { |
| if (measuredWidth) { |
| *measuredWidth = 0; |
| } |
| return 0; |
| } |
| if (0 == fSize) { |
| if (measuredWidth) { |
| *measuredWidth = 0; |
| } |
| return length; |
| } |
| |
| SkCanonicalizeFont canon(*this); |
| const SkFont& font = canon.getFont(); |
| SkScalar scale = canon.getScale(); |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font); |
| |
| const char* text = static_cast<const char*>(textD); |
| const char* stop = text + length; |
| auto glyphCacheProc = SkFontPriv::GetGlyphCacheProc(encoding, false); |
| |
| if (scale) { |
| maxWidth /= scale; |
| } |
| |
| SkScalar width = 0; |
| while (text < stop) { |
| const char* curr = text; |
| SkScalar x = glyphCacheProc(cache.get(), &text, stop).fAdvanceX; |
| if ((width += x) > maxWidth) { |
| width -= x; |
| text = curr; |
| break; |
| } |
| } |
| |
| if (measuredWidth) { |
| if (scale) { |
| width *= scale; |
| } |
| *measuredWidth = width; |
| } |
| return text - stop + length; |
| } |
| |
| 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)); |
| } |
| |
| SkScalar SkFont::measureText(const void* textD, size_t length, SkTextEncoding encoding, |
| SkRect* bounds) const { |
| if (length == 0) { |
| if (bounds) { |
| bounds->setEmpty(); |
| } |
| return 0; |
| } |
| |
| SkCanonicalizeFont canon(*this); |
| const SkFont& font = canon.getFont(); |
| SkScalar scale = canon.getScale(); |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font); |
| |
| const char* text = static_cast<const char*>(textD); |
| const char* stop = text + length; |
| auto glyphCacheProc = SkFontPriv::GetGlyphCacheProc(encoding, nullptr != bounds); |
| const SkGlyph* g = &glyphCacheProc(cache.get(), &text, stop); |
| SkScalar width = g->fAdvanceX; |
| |
| if (nullptr == bounds) { |
| while (text < stop) { |
| width += glyphCacheProc(cache.get(), &text, stop).fAdvanceX; |
| } |
| } else { |
| set_bounds(*g, bounds); |
| while (text < stop) { |
| g = &glyphCacheProc(cache.get(), &text, stop); |
| join_bounds_x(*g, bounds, width); |
| width += g->fAdvanceX; |
| } |
| } |
| SkASSERT(text == stop); |
| |
| if (scale) { |
| width *= scale; |
| if (bounds) { |
| bounds->fLeft *= scale; |
| bounds->fTop *= scale; |
| bounds->fRight *= scale; |
| bounds->fBottom *= scale; |
| } |
| } |
| return width; |
| } |
| |
| static SkRect make_bounds(const SkGlyph& g, SkScalar scale) { |
| return { |
| g.fLeft * scale, |
| g.fTop * scale, |
| (g.fLeft + g.fWidth) * scale, |
| (g.fTop + g.fHeight) * scale |
| }; |
| } |
| |
| template <typename HANDLER> |
| void VisitGlyphs(const SkFont& origFont, const SkPaint* paint, const uint16_t glyphs[], int count, |
| HANDLER handler) { |
| if (count <= 0) { |
| return; |
| } |
| |
| SkCanonicalizeFont canon(origFont); |
| const SkFont& font = canon.getFont(); |
| SkScalar scale = canon.getScale(); |
| if (!scale) { |
| scale = 1; |
| } |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font, |
| paint ? *paint : SkPaint()); |
| handler(cache.get(), glyphs, count, scale); |
| } |
| |
| void SkFont::getWidthsBounds(const uint16_t glyphs[], int count, SkScalar widths[], SkRect bounds[], |
| const SkPaint* paint) const { |
| VisitGlyphs(*this, paint, glyphs, count, [widths, bounds] |
| (SkGlyphCache* cache, const uint16_t glyphs[], int count, SkScalar scale) { |
| for (int i = 0; i < count; ++i) { |
| const SkGlyph* g; |
| if (bounds) { |
| g = &cache->getGlyphIDMetrics(glyphs[i]); |
| bounds[i] = make_bounds(*g, scale); |
| } else { |
| g = &cache->getGlyphIDAdvance(glyphs[i]); |
| } |
| if (widths) { |
| widths[i] = g->fAdvanceX * scale; |
| } |
| } |
| }); |
| } |
| |
| void SkFont::getPos(const uint16_t glyphs[], int count, SkPoint pos[], SkPoint origin) const { |
| VisitGlyphs(*this, nullptr, glyphs, count, [pos, origin] |
| (SkGlyphCache* cache, const uint16_t glyphs[], int count, SkScalar scale) { |
| SkPoint loc = origin; |
| for (int i = 0; i < count; ++i) { |
| pos[i] = loc; |
| loc.fX += cache->getGlyphIDAdvance(glyphs[i]).fAdvanceX * scale; |
| } |
| }); |
| } |
| |
| void SkFont::getXPos(const uint16_t glyphs[], int count, SkScalar xpos[], SkScalar origin) const { |
| VisitGlyphs(*this, nullptr, glyphs, count, [xpos, origin] |
| (SkGlyphCache* cache, const uint16_t glyphs[], int count, SkScalar scale) { |
| SkScalar x = origin; |
| for (int i = 0; i < count; ++i) { |
| xpos[i] = x; |
| x += cache->getGlyphIDAdvance(glyphs[i]).fAdvanceX * scale; |
| } |
| }); |
| } |
| |
| void SkFont::getPaths(const uint16_t glyphs[], int count, |
| void (*proc)(const SkPath*, const SkMatrix&, void*), void* ctx) const { |
| SkFont font(*this); |
| SkScalar scale = font.setupForAsPaths(nullptr); |
| if (!scale) { |
| scale = 1; |
| } |
| const SkMatrix mx = SkMatrix::MakeScale(scale, scale); |
| |
| auto exclusive = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font); |
| auto cache = exclusive.get(); |
| |
| for (int i = 0; i < count; ++i) { |
| proc(cache->findPath(cache->getGlyphIDMetrics(glyphs[i])), mx, ctx); |
| } |
| } |
| |
| bool SkFont::getPath(uint16_t glyphID, SkPath* path) const { |
| struct Pair { |
| SkPath* fPath; |
| bool fWasSet; |
| } pair = { path, false }; |
| |
| this->getPaths(&glyphID, 1, [](const SkPath* orig, const SkMatrix& mx, void* ctx) { |
| Pair* pair = static_cast<Pair*>(ctx); |
| if (orig) { |
| orig->transform(mx, pair->fPath); |
| pair->fWasSet = true; |
| } |
| }, &pair); |
| return pair.fWasSet; |
| } |
| |
| SkScalar SkFont::getMetrics(SkFontMetrics* metrics) const { |
| SkCanonicalizeFont canon(*this); |
| const SkFont& font = canon.getFont(); |
| SkScalar scale = canon.getScale(); |
| |
| SkFontMetrics storage; |
| if (nullptr == metrics) { |
| metrics = &storage; |
| } |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font); |
| *metrics = cache->getFontMetrics(); |
| |
| if (scale) { |
| SkPaintPriv::ScaleFontMetrics(metrics, scale); |
| } |
| return metrics->fDescent - metrics->fAscent + metrics->fLeading; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkPaint.h" |
| |
| void SkFont::LEGACY_applyToPaint(SkPaint* paint) const { |
| paint->setTypeface(fTypeface); |
| paint->setTextSize(fSize); |
| paint->setTextScaleX(fScaleX); |
| paint->setTextSkewX(fSkewX); |
| |
| paint->setEmbeddedBitmapText(SkToBool(fFlags & kEmbeddedBitmaps_PrivFlag)); |
| paint->setFakeBoldText(SkToBool(fFlags & kEmbolden_PrivFlag)); |
| paint->setAutohinted(SkToBool(fFlags & kForceAutoHinting_PrivFlag)); |
| paint->setSubpixelText(SkToBool(fFlags & kSubpixel_PrivFlag)); |
| paint->setLinearText(SkToBool(fFlags & kLinearMetrics_PrivFlag)); |
| |
| bool doAA = false, |
| doLCD = false; |
| switch (this->getEdging()) { |
| case Edging::kAlias: break; |
| case Edging::kAntiAlias: doAA = true; break; |
| case Edging::kSubpixelAntiAlias: doAA = true; doLCD = true; break; |
| } |
| paint->setAntiAlias(doAA); |
| paint->setLCDRenderText(doLCD); |
| |
| paint->setHinting((SkFontHinting)this->getHinting()); |
| } |
| |
| SkFont SkFont::LEGACY_ExtractFromPaint(const SkPaint& paint) { |
| SkFont font(sk_ref_sp(paint.getTypeface()), paint.getTextSize(), paint.getTextScaleX(), |
| paint.getTextSkewX()); |
| font.LEGACY_applyPaintFlags(paint.getFlags()); |
| font.setHinting((SkFontHinting)paint.getHinting()); |
| return font; |
| } |
| |
| void SkFont::LEGACY_applyPaintFlags(uint32_t paintFlags) { |
| uint32_t flags = 0; |
| if (paintFlags & SkPaint::kEmbeddedBitmapText_Flag) { |
| flags |= kEmbeddedBitmaps_PrivFlag; |
| } |
| if (paintFlags & SkPaint::kFakeBoldText_Flag) { |
| flags |= kEmbolden_PrivFlag; |
| } |
| if (paintFlags & SkPaint::kAutoHinting_Flag) { |
| flags |= kForceAutoHinting_PrivFlag; |
| } |
| if (paintFlags & SkPaint::kSubpixelText_Flag) { |
| flags |= kSubpixel_PrivFlag; |
| } |
| if (paintFlags & SkPaint::kLinearText_Flag) { |
| flags |= kLinearMetrics_PrivFlag; |
| } |
| fFlags = flags; |
| |
| Edging edging = Edging::kAlias; |
| if (paintFlags & SkPaint::kAntiAlias_Flag) { |
| edging = Edging::kAntiAlias; |
| if (paintFlags & SkPaint::kLCDRenderText_Flag) { |
| edging = Edging::kSubpixelAntiAlias; |
| } |
| } |
| this->setEdging(edging); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkRect SkFontPriv::GetFontBounds(const SkFont& font) { |
| SkMatrix m; |
| m.setScale(font.getSize() * font.getScaleX(), font.getSize()); |
| m.postSkew(font.getSkewX(), 0); |
| |
| SkTypeface* typeface = SkFontPriv::GetTypefaceOrDefault(font); |
| |
| SkRect bounds; |
| m.mapRect(&bounds, typeface->getBounds()); |
| return bounds; |
| } |
| |
| int SkFontPriv::CountTextElements(const void* text, size_t byteLength, SkTextEncoding encoding) { |
| switch (encoding) { |
| case kUTF8_SkTextEncoding: |
| return SkUTF::CountUTF8(reinterpret_cast<const char*>(text), byteLength); |
| case kUTF16_SkTextEncoding: |
| return SkUTF::CountUTF16(reinterpret_cast<const uint16_t*>(text), byteLength); |
| case kUTF32_SkTextEncoding: |
| return byteLength >> 2; |
| case kGlyphID_SkTextEncoding: |
| return byteLength >> 1; |
| } |
| SkASSERT(false); |
| return 0; |
| } |
| |
| void SkFontPriv::GlyphsToUnichars(const SkFont& font, const uint16_t glyphs[], int count, |
| SkUnichar uni[]) { |
| font.glyphsToUnichars(glyphs, count, uni); |
| } |
