| /* |
| * Copyright 2018 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. |
| */ |
| |
| #ifndef SkGlyphRunInfo_DEFINED |
| #define SkGlyphRunInfo_DEFINED |
| |
| #include <functional> |
| #include <memory> |
| #include <vector> |
| |
| #include "SkDescriptor.h" |
| #include "SkMask.h" |
| #include "SkPath.h" |
| #include "SkPoint.h" |
| #include "SkTypes.h" |
| |
| class SkBaseDevice; |
| |
| template <typename T> |
| class SkSpan { |
| public: |
| SkSpan() : fPtr{nullptr}, fSize{0} {} |
| SkSpan(T* ptr, ptrdiff_t size) : fPtr{ptr}, fSize{size} { SkASSERT(size >= 0); } |
| template <typename U> |
| explicit SkSpan(std::vector<U>& v) : fPtr{v.data()}, fSize{SkTo<ptrdiff_t>(v.size())} {} |
| SkSpan(const SkSpan<T>& o) = default; |
| SkSpan& operator=( const SkSpan& other ) = default; |
| T& operator [] (ptrdiff_t i) const { return fPtr[i]; } |
| T* begin() const { return fPtr; } |
| T* end() const { return fPtr + fSize; } |
| const T* cbegin() const { return fPtr; } |
| const T* cend() const { return fPtr + fSize; } |
| T* data() const { return fPtr; } |
| ptrdiff_t size() const { return fSize; } |
| bool empty() const { return fSize == 0; } |
| |
| private: |
| T* fPtr; |
| ptrdiff_t fSize; |
| }; |
| |
| class SkGlyphRun { |
| public: |
| SkGlyphRun() = default; |
| SkGlyphRun(SkPaint&& runPaint, |
| SkSpan<const uint16_t> denseIndices, |
| SkSpan<const SkPoint> positions, |
| SkSpan<const SkGlyphID> glyphIDs, |
| SkSpan<const SkGlyphID> uniqueGlyphIDs, |
| SkSpan<const char> text, |
| SkSpan<const uint32_t> clusters); |
| |
| // The temporaryShunt calls are to allow inter-operating with existing code while glyph runs |
| // are developed. |
| void temporaryShuntToDrawPosText(SkBaseDevice* device); |
| using TemporaryShuntCallback = std::function<void(size_t, const char*, const SkScalar*)>; |
| void temporaryShuntToCallback(TemporaryShuntCallback callback); |
| |
| size_t runSize() const { return fUniqueGlyphIDIndices.size(); } |
| uint16_t uniqueSize() const { return fUniqueGlyphIDs.size(); } |
| SkSpan<const SkPoint> positions() const { return fPositions; } |
| SkSpan<const SkGlyphID> uniqueGlyphIDs() const { return fUniqueGlyphIDs; } |
| SkSpan<const SkGlyphID> shuntGlyphsIDs() const { return fTemporaryShuntGlyphIDs; } |
| |
| private: |
| // |
| const SkSpan<const uint16_t> fUniqueGlyphIDIndices; |
| // |
| const SkSpan<const SkPoint> fPositions; |
| // This is temporary while converting from the old per glyph code to the bulk code. |
| const SkSpan<const SkGlyphID> fTemporaryShuntGlyphIDs; |
| // The unique glyphs from fTemporaryShuntGlyphIDs. |
| const SkSpan<const SkGlyphID> fUniqueGlyphIDs; |
| // Original text from SkTextBlob if present. Will be empty of not present. |
| const SkSpan<const char> fText; |
| // Original clusters from SkTextBlob if present. Will be empty if not present. |
| const SkSpan<const uint32_t> fClusters; |
| // Paint for this run modified to have glyph encoding and left alignment. |
| const SkPaint fRunPaint; |
| }; |
| |
| // A faster set implementation that does not need any initialization, and reading the set items |
| // is order the number of items, and not the size of the universe. |
| // This implementation is based on the paper by Briggs and Torczon, "An Efficient Representation |
| // for Sparse Sets" |
| // |
| // This implementation assumes that the unique glyphs added are appended to a vector that may |
| // already have unique glyph from a previous computation. This allows the packing of multiple |
| // UniqueID sequences in a single vector. |
| class SkGlyphSet { |
| public: |
| SkGlyphSet() = default; |
| uint16_t add(SkGlyphID glyphID); |
| void reuse(uint32_t glyphUniverseSize, std::vector<SkGlyphID>* uniqueGlyphIDs); |
| |
| private: |
| uint32_t uniqueSize(); |
| uint32_t fUniverseSize{0}; |
| size_t fStartOfUniqueIDs{0}; |
| std::vector<uint16_t> fIndices; |
| std::vector<SkGlyphID>* fUniqueGlyphIDs{nullptr}; |
| }; |
| |
| class SkGlyphRunBuilder { |
| public: |
| SkGlyphRunBuilder() = default; |
| void prepareDrawText( |
| const SkPaint& paint, const void* bytes, size_t byteLength, SkPoint origin); |
| void prepareDrawPosTextH( |
| const SkPaint& paint, const void* bytes, size_t byteLength, |
| const SkScalar xpos[], SkScalar constY); |
| void prepareDrawPosText( |
| const SkPaint& paint, const void* bytes, size_t byteLength, const SkPoint pos[]); |
| void prepareTextBlob(const SkPaint& paint, const SkTextBlob& blob, SkPoint origin); |
| |
| SkGlyphRun* useGlyphRun(); |
| |
| private: |
| void initialize(); |
| void addDenseAndUnique(const SkPaint& paint, const void* bytes, size_t byteLength); |
| void makeGlyphRun( |
| const SkPaint& runPaint, SkSpan<const char> text, SkSpan<const uint32_t> clusters); |
| |
| void drawText( |
| const SkPaint& paint, const void* bytes, size_t byteLength, SkPoint origin, |
| SkSpan<const char> text, SkSpan<const uint32_t> clusters); |
| void drawPosTextH( |
| const SkPaint& paint, const void* bytes, size_t byteLength, |
| const SkScalar* xpos, SkScalar constY, |
| SkSpan<const char> text, SkSpan<const uint32_t> clusters); |
| void drawPosText( |
| const SkPaint& paint, const void* bytes, size_t byteLength, const SkPoint* pos, |
| SkSpan<const char> text, SkSpan<const uint32_t> clusters); |
| |
| uint64_t fUniqueID{0}; |
| |
| std::vector<uint16_t> fDenseIndex; |
| std::vector<SkPoint> fPositions; |
| std::vector<SkGlyphID> fUniqueGlyphIDs; |
| SkGlyphID* fGlyphIDs{nullptr}; |
| |
| // Used as a temporary for preparing using utfN text. This implies that only one run of |
| // glyph ids will ever be needed because blobs are already glyph based. |
| std::vector<SkGlyphID> fScratchGlyphIDs; |
| |
| // Used as temporary storage for calculating positions for drawText. |
| std::vector<SkPoint> fScratchAdvances; |
| |
| |
| // Used as temporary glyph run for the rest of the Text stack. |
| SkGlyphRun fScratchGlyphRun; |
| |
| // Used for collecting the set of unique glyphs. |
| SkGlyphSet fGlyphSet; |
| }; |
| |
| #endif // SkGlyphRunInfo_DEFINED |