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/*
* 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;
float 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;
}
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
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