| /* |
| * 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 "SkPaint.h" |
| #include "SkPaintDefaults.h" |
| #include "SkPath.h" |
| #include "SkScalerContext.h" |
| #include "SkStrike.h" |
| #include "SkStrikeCache.h" |
| #include "SkTo.h" |
| #include "SkTLazy.h" |
| #include "SkTypeface.h" |
| #include "SkUTF.h" |
| #include "SkUtils.h" |
| |
| #define kDefault_Size SkPaintDefaults_TextSize |
| #define kDefault_Flags 0 |
| #define kDefault_Edging SkFont::Edging::kAntiAlias |
| #define kDefault_Hinting SkPaintDefaults_Hinting |
| |
| 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(std::move(face)) |
| , 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(sk_sp<SkTypeface> face) : SkFont(std::move(face), kDefault_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; |
| } |
| |
| void SkFont::dump() const { |
| SkDebugf("typeface %p\n", fTypeface.get()); |
| SkDebugf("size %g\n", fSize); |
| SkDebugf("skewx %g\n", fSkewX); |
| SkDebugf("scalex %g\n", fScaleX); |
| SkDebugf("flags 0x%X\n", fFlags); |
| SkDebugf("edging %d\n", (unsigned)fEdging); |
| SkDebugf("hinting %d\n", (unsigned)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(SkFontPriv::kCanonicalTextSizeForPaths)); |
| return textSize / SkFontPriv::kCanonicalTextSizeForPaths; |
| } |
| |
| bool SkFont::hasSomeAntiAliasing() const { |
| Edging edging = this->getEdging(); |
| return edging == SkFont::Edging::kAntiAlias |
| || edging == SkFont::Edging::kSubpixelAntiAlias; |
| } |
| |
| class SkCanonicalizeFont { |
| public: |
| SkCanonicalizeFont(const SkFont& font, const SkPaint* paint) : fFont(&font) { |
| if (paint) { |
| fPaint = *paint; |
| } |
| if (font.isLinearMetrics() || |
| SkDraw::ShouldDrawTextAsPaths(font, fPaint, SkMatrix::I())) |
| { |
| SkFont* f = fLazyFont.set(font); |
| fScale = f->setupForAsPaths(nullptr); |
| fFont = f; |
| fPaint.reset(); |
| } |
| } |
| |
| const SkFont& getFont() const { return *fFont; } |
| const SkPaint& getPaint() const { return fPaint; } |
| SkScalar getScale() const { return fScale; } |
| |
| private: |
| const SkFont* fFont; |
| SkTLazy<SkFont> fLazyFont; |
| SkPaint fPaint; |
| SkScalar fScale = 0; |
| }; |
| |
| SkGlyphID SkFont::unicharToGlyph(SkUnichar uni) const { |
| return this->getTypefaceOrDefault()->unicharToGlyph(uni); |
| } |
| |
| 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) this->getTypefaceOrDefault()->charsToGlyphs(text, typefaceEncoding, glyphs,count); |
| return count; |
| } |
| |
| void SkFont::glyphsToUnichars(const SkGlyphID glyphs[], int count, SkUnichar text[]) const { |
| if (count <= 0) { |
| return; |
| } |
| |
| auto typeface = this->getTypefaceOrDefault(); |
| 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 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* text, size_t length, SkTextEncoding encoding, |
| SkRect* bounds, const SkPaint* paint) const { |
| SkCanonicalizeFont canon(*this, paint); |
| const SkFont& font = canon.getFont(); |
| const SkScalar scale = canon.getScale(); |
| |
| SkAutoToGlyphs atg(font, text, length, encoding); |
| const int count = atg.count(); |
| if (count == 0) { |
| if (bounds) { |
| bounds->setEmpty(); |
| } |
| return 0; |
| } |
| const uint16_t* glyphs = atg.glyphs(); |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font, canon.getPaint()); |
| |
| SkScalar width = 0; |
| if (bounds) { |
| const SkGlyph* g = &cache->getGlyphIDMetrics(glyphs[0]); |
| set_bounds(*g, bounds); |
| width = g->fAdvanceX; |
| for (int i = 1; i < count; ++i) { |
| g = &cache->getGlyphIDMetrics(glyphs[i]); |
| join_bounds_x(*g, bounds, width); |
| width += g->fAdvanceX; |
| } |
| } else { |
| for (int i = 0; i < count; ++i) { |
| width += cache->getGlyphIDAdvance(glyphs[i]).fAdvanceX; |
| } |
| } |
| |
| 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, paint); |
| const SkFont& font = canon.getFont(); |
| SkScalar scale = canon.getScale(); |
| if (!scale) { |
| scale = 1; |
| } |
| |
| auto cache = SkStrikeCache::FindOrCreateStrikeWithNoDeviceExclusive(font, canon.getPaint()); |
| 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] |
| (SkStrike* 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] |
| (SkStrike* 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] |
| (SkStrike* 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, nullptr); |
| 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) { |
| SkFontPriv::ScaleFontMetrics(metrics, scale); |
| } |
| return metrics->fDescent - metrics->fAscent + metrics->fLeading; |
| } |
| |
| SkTypeface* SkFont::getTypefaceOrDefault() const { |
| return fTypeface ? fTypeface.get() : SkTypeface::GetDefaultTypeface(); |
| } |
| |
| sk_sp<SkTypeface> SkFont::refTypefaceOrDefault() const { |
| return fTypeface ? fTypeface : SkTypeface::MakeDefault(); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| int SkFontPriv::ValidCountText(const void* text, size_t length, SkTextEncoding encoding) { |
| switch (encoding) { |
| case kUTF8_SkTextEncoding: return SkUTF::CountUTF8((const char*)text, length); |
| case kUTF16_SkTextEncoding: return SkUTF::CountUTF16((const uint16_t*)text, length); |
| case kUTF32_SkTextEncoding: return SkUTF::CountUTF32((const int32_t*)text, length); |
| case kGlyphID_SkTextEncoding: |
| if (!SkIsAlign2(intptr_t(text)) || !SkIsAlign2(length)) { |
| return -1; |
| } |
| return length >> 1; |
| } |
| return -1; |
| } |
| |
| void SkFontPriv::ScaleFontMetrics(SkFontMetrics* metrics, SkScalar scale) { |
| metrics->fTop *= scale; |
| metrics->fAscent *= scale; |
| metrics->fDescent *= scale; |
| metrics->fBottom *= scale; |
| metrics->fLeading *= scale; |
| metrics->fAvgCharWidth *= scale; |
| metrics->fMaxCharWidth *= scale; |
| metrics->fXMin *= scale; |
| metrics->fXMax *= scale; |
| metrics->fXHeight *= scale; |
| metrics->fCapHeight *= scale; |
| metrics->fUnderlineThickness *= scale; |
| metrics->fUnderlinePosition *= scale; |
| metrics->fStrikeoutThickness *= scale; |
| metrics->fStrikeoutPosition *= scale; |
| } |
| |
| SkRect SkFontPriv::GetFontBounds(const SkFont& font) { |
| SkMatrix m; |
| m.setScale(font.getSize() * font.getScaleX(), font.getSize()); |
| m.postSkew(font.getSkewX(), 0); |
| |
| SkTypeface* typeface = font.getTypefaceOrDefault(); |
| |
| 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); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| |
| // packed int at the beginning of the serialized font: |
| // |
| // control_bits:8 size_as_byte:8 flags:12 edging:2 hinting:2 |
| |
| enum { |
| kSize_Is_Byte_Bit = 1 << 31, |
| kHas_ScaleX_Bit = 1 << 30, |
| kHas_SkewX_Bit = 1 << 29, |
| kHas_Typeface_Bit = 1 << 28, |
| |
| kShift_for_Size = 16, |
| kMask_For_Size = 0xFF, |
| |
| kShift_For_Flags = 4, |
| kMask_For_Flags = 0xFFF, |
| |
| kShift_For_Edging = 2, |
| kMask_For_Edging = 0x3, |
| |
| kShift_For_Hinting = 0, |
| kMask_For_Hinting = 0x3 |
| }; |
| |
| static bool scalar_is_byte(SkScalar x) { |
| int ix = (int)x; |
| return ix == x && ix >= 0 && ix <= kMask_For_Size; |
| } |
| |
| void SkFontPriv::Flatten(const SkFont& font, SkWriteBuffer& buffer) { |
| SkASSERT((font.fFlags & ~kMask_For_Flags) == 0); |
| SkASSERT((font.fEdging & ~kMask_For_Edging) == 0); |
| SkASSERT((font.fHinting & ~kMask_For_Hinting) == 0); |
| |
| uint32_t packed = 0; |
| packed |= font.fFlags << kShift_For_Flags; |
| packed |= font.fEdging << kShift_For_Edging; |
| packed |= font.fHinting << kShift_For_Hinting; |
| |
| if (scalar_is_byte(font.fSize)) { |
| packed |= kSize_Is_Byte_Bit; |
| packed |= (int)font.fSize << kShift_for_Size; |
| } |
| if (font.fScaleX != 1) { |
| packed |= kHas_ScaleX_Bit; |
| } |
| if (font.fSkewX != 0) { |
| packed |= kHas_SkewX_Bit; |
| } |
| if (font.fTypeface) { |
| packed |= kHas_Typeface_Bit; |
| } |
| |
| buffer.write32(packed); |
| if (!(packed & kSize_Is_Byte_Bit)) { |
| buffer.writeScalar(font.fSize); |
| } |
| if (packed & kHas_ScaleX_Bit) { |
| buffer.writeScalar(font.fScaleX); |
| } |
| if (packed & kHas_SkewX_Bit) { |
| buffer.writeScalar(font.fSkewX); |
| } |
| if (packed & kHas_Typeface_Bit) { |
| buffer.writeTypeface(font.fTypeface.get()); |
| } |
| } |
| |
| bool SkFontPriv::Unflatten(SkFont* font, SkReadBuffer& buffer) { |
| const uint32_t packed = buffer.read32(); |
| |
| if (packed & kSize_Is_Byte_Bit) { |
| font->fSize = (packed >> kShift_for_Size) & kMask_For_Size; |
| } else { |
| font->fSize = buffer.readScalar(); |
| } |
| if (packed & kHas_ScaleX_Bit) { |
| font->fScaleX = buffer.readScalar(); |
| } |
| if (packed & kHas_SkewX_Bit) { |
| font->fSkewX = buffer.readScalar(); |
| } |
| if (packed & kHas_Typeface_Bit) { |
| font->fTypeface = buffer.readTypeface(); |
| } |
| |
| SkASSERT(SkFont::kAllFlags <= kMask_For_Flags); |
| // we & with kAllFlags, to clear out any unknown flag bits |
| font->fFlags = SkToU8((packed >> kShift_For_Flags) & SkFont::kAllFlags); |
| |
| unsigned edging = (packed >> kShift_For_Edging) & kMask_For_Edging; |
| if (edging > (unsigned)SkFont::Edging::kSubpixelAntiAlias) { |
| edging = 0; |
| } |
| font->fEdging = SkToU8(edging); |
| |
| unsigned hinting = (packed >> kShift_For_Hinting) & kMask_For_Hinting; |
| if (hinting > (unsigned)kFull_SkFontHinting) { |
| hinting = 0; |
| } |
| font->fHinting = SkToU8(hinting); |
| |
| return buffer.isValid(); |
| } |
