| /* |
| * 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. |
| */ |
| |
| #ifndef SkGlyph_DEFINED |
| #define SkGlyph_DEFINED |
| |
| #include "SkChecksum.h" |
| #include "SkTypes.h" |
| #include "SkFixed.h" |
| #include "SkMask.h" |
| |
| class SkPath; |
| class SkGlyphCache; |
| |
| // needs to be != to any valid SkMask::Format |
| #define MASK_FORMAT_UNKNOWN (0xFF) |
| #define MASK_FORMAT_JUST_ADVANCE MASK_FORMAT_UNKNOWN |
| |
| #define kMaxGlyphWidth (1<<13) |
| |
| SK_BEGIN_REQUIRE_DENSE |
| class SkGlyph { |
| enum { |
| kSubBits = 2, |
| kSubMask = ((1 << kSubBits) - 1), |
| kSubShift = 24, // must be large enough for glyphs and unichars |
| kCodeMask = ((1 << kSubShift) - 1), |
| // relative offsets for X and Y subpixel bits |
| kSubShiftX = kSubBits, |
| kSubShiftY = 0 |
| }; |
| |
| // Support horizontal and vertical skipping strike-through / underlines. |
| // The caller walks the linked list looking for a match. For a horizontal underline, |
| // the fBounds contains the top and bottom of the underline. The fInterval pair contains the |
| // beginning and end of of the intersection of the bounds and the glyph's path. |
| // If interval[0] >= interval[1], no intesection was found. |
| struct Intercept { |
| Intercept* fNext; |
| SkScalar fBounds[2]; // for horz underlines, the boundaries in Y |
| SkScalar fInterval[2]; // the outside intersections of the axis and the glyph |
| }; |
| |
| struct PathData { |
| Intercept* fIntercept; |
| SkPath* fPath; |
| }; |
| |
| public: |
| static const SkFixed kSubpixelRound = SK_FixedHalf >> SkGlyph::kSubBits; |
| // A value that can never be generated by MakeID. |
| static const uint32_t kImpossibleID = ~0; |
| void* fImage; |
| PathData* fPathData; |
| SkFixed fAdvanceX, fAdvanceY; |
| |
| uint16_t fWidth, fHeight; |
| int16_t fTop, fLeft; |
| |
| uint8_t fMaskFormat; |
| int8_t fRsbDelta, fLsbDelta; // used by auto-kerning |
| int8_t fForceBW; |
| |
| void initWithGlyphID(uint32_t glyph_id) { |
| this->initCommon(MakeID(glyph_id)); |
| } |
| |
| void initGlyphIdFrom(const SkGlyph& glyph) { |
| this->initCommon(glyph.fID); |
| } |
| |
| void initGlyphFromCombinedID(uint32_t combined_id) { |
| this->initCommon(combined_id); |
| } |
| |
| /** |
| * Compute the rowbytes for the specified width and mask-format. |
| */ |
| static unsigned ComputeRowBytes(unsigned width, SkMask::Format format) { |
| unsigned rb = width; |
| if (SkMask::kBW_Format == format) { |
| rb = (rb + 7) >> 3; |
| } else if (SkMask::kARGB32_Format == format) { |
| rb <<= 2; |
| } else if (SkMask::kLCD16_Format == format) { |
| rb = SkAlign4(rb << 1); |
| } else { |
| rb = SkAlign4(rb); |
| } |
| return rb; |
| } |
| |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| // Temporary accessor for Android. |
| SkFixed advanceXFixed() const { return fAdvanceX; } |
| // Temporary accessor for Android. |
| SkFixed advanceYFixed() const { return fAdvanceY; } |
| #endif |
| |
| unsigned rowBytes() const { |
| return ComputeRowBytes(fWidth, (SkMask::Format)fMaskFormat); |
| } |
| |
| bool isJustAdvance() const { |
| return MASK_FORMAT_JUST_ADVANCE == fMaskFormat; |
| } |
| |
| bool isFullMetrics() const { |
| return MASK_FORMAT_JUST_ADVANCE != fMaskFormat; |
| } |
| |
| uint16_t getGlyphID() const { |
| return ID2Code(fID); |
| } |
| |
| unsigned getSubX() const { |
| return ID2SubX(fID); |
| } |
| |
| SkFixed getSubXFixed() const { |
| return SubToFixed(ID2SubX(fID)); |
| } |
| |
| SkFixed getSubYFixed() const { |
| return SubToFixed(ID2SubY(fID)); |
| } |
| |
| size_t computeImageSize() const; |
| |
| /** Call this to set all of the metrics fields to 0 (e.g. if the scaler |
| encounters an error measuring a glyph). Note: this does not alter the |
| fImage, fPath, fID, fMaskFormat fields. |
| */ |
| void zeroMetrics(); |
| |
| void toMask(SkMask* mask) const; |
| |
| class HashTraits { |
| public: |
| static uint32_t GetKey(const SkGlyph& glyph) { |
| return glyph.fID; |
| } |
| static uint32_t Hash(uint32_t glyphId) { |
| return SkChecksum::CheapMix(glyphId); |
| } |
| }; |
| |
| private: |
| // TODO(herb) remove friend statement after SkGlyphCache cleanup. |
| friend class SkGlyphCache; |
| |
| void initCommon(uint32_t id) { |
| fID = id; |
| fImage = nullptr; |
| fPathData = nullptr; |
| fMaskFormat = MASK_FORMAT_UNKNOWN; |
| fForceBW = 0; |
| } |
| |
| static unsigned ID2Code(uint32_t id) { |
| return id & kCodeMask; |
| } |
| |
| static unsigned ID2SubX(uint32_t id) { |
| return id >> (kSubShift + kSubShiftX); |
| } |
| |
| static unsigned ID2SubY(uint32_t id) { |
| return (id >> (kSubShift + kSubShiftY)) & kSubMask; |
| } |
| |
| static unsigned FixedToSub(SkFixed n) { |
| return (n >> (16 - kSubBits)) & kSubMask; |
| } |
| |
| static SkFixed SubToFixed(unsigned sub) { |
| SkASSERT(sub <= kSubMask); |
| return sub << (16 - kSubBits); |
| } |
| |
| static uint32_t MakeID(unsigned code) { |
| SkASSERT(code <= kCodeMask); |
| SkASSERT(code != kImpossibleID); |
| return code; |
| } |
| |
| static uint32_t MakeID(unsigned code, SkFixed x, SkFixed y) { |
| SkASSERT(code <= kCodeMask); |
| x = FixedToSub(x); |
| y = FixedToSub(y); |
| uint32_t ID = (x << (kSubShift + kSubShiftX)) | |
| (y << (kSubShift + kSubShiftY)) | |
| code; |
| SkASSERT(ID != kImpossibleID); |
| return ID; |
| } |
| |
| // FIXME - This is needed because the Android frame work directly |
| // accesses fID. Remove when fID accesses are cleaned up. |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| public: |
| #endif |
| uint32_t fID; |
| }; |
| SK_END_REQUIRE_DENSE |
| |
| #endif |