1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkGlyph.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,150 @@
1.4 +/*
1.5 + * Copyright 2006 The Android Open Source Project
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkGlyph_DEFINED
1.12 +#define SkGlyph_DEFINED
1.13 +
1.14 +#include "SkTypes.h"
1.15 +#include "SkFixed.h"
1.16 +#include "SkMask.h"
1.17 +
1.18 +class SkPath;
1.19 +
1.20 +// needs to be != to any valid SkMask::Format
1.21 +#define MASK_FORMAT_UNKNOWN (0xFF)
1.22 +#define MASK_FORMAT_JUST_ADVANCE MASK_FORMAT_UNKNOWN
1.23 +
1.24 +#define kMaxGlyphWidth (1<<13)
1.25 +
1.26 +struct SkGlyph {
1.27 + void* fImage;
1.28 + SkPath* fPath;
1.29 + SkFixed fAdvanceX, fAdvanceY;
1.30 +
1.31 + uint32_t fID;
1.32 + uint16_t fWidth, fHeight;
1.33 + int16_t fTop, fLeft;
1.34 +
1.35 + uint8_t fMaskFormat;
1.36 + int8_t fRsbDelta, fLsbDelta; // used by auto-kerning
1.37 +
1.38 + void init(uint32_t id) {
1.39 + fID = id;
1.40 + fImage = NULL;
1.41 + fPath = NULL;
1.42 + fMaskFormat = MASK_FORMAT_UNKNOWN;
1.43 + }
1.44 +
1.45 + /**
1.46 + * Compute the rowbytes for the specified width and mask-format.
1.47 + */
1.48 + static unsigned ComputeRowBytes(unsigned width, SkMask::Format format) {
1.49 + unsigned rb = width;
1.50 + if (SkMask::kBW_Format == format) {
1.51 + rb = (rb + 7) >> 3;
1.52 + } else if (SkMask::kARGB32_Format == format ||
1.53 + SkMask::kLCD32_Format == format)
1.54 + {
1.55 + rb <<= 2;
1.56 + } else if (SkMask::kLCD16_Format == format) {
1.57 + rb = SkAlign4(rb << 1);
1.58 + } else {
1.59 + rb = SkAlign4(rb);
1.60 + }
1.61 + return rb;
1.62 + }
1.63 +
1.64 + unsigned rowBytes() const {
1.65 + return ComputeRowBytes(fWidth, (SkMask::Format)fMaskFormat);
1.66 + }
1.67 +
1.68 + bool isJustAdvance() const {
1.69 + return MASK_FORMAT_JUST_ADVANCE == fMaskFormat;
1.70 + }
1.71 +
1.72 + bool isFullMetrics() const {
1.73 + return MASK_FORMAT_JUST_ADVANCE != fMaskFormat;
1.74 + }
1.75 +
1.76 + uint16_t getGlyphID() const {
1.77 + return ID2Code(fID);
1.78 + }
1.79 +
1.80 + unsigned getGlyphID(unsigned baseGlyphCount) const {
1.81 + unsigned code = ID2Code(fID);
1.82 + SkASSERT(code >= baseGlyphCount);
1.83 + return code - baseGlyphCount;
1.84 + }
1.85 +
1.86 + unsigned getSubX() const {
1.87 + return ID2SubX(fID);
1.88 + }
1.89 +
1.90 + SkFixed getSubXFixed() const {
1.91 + return SubToFixed(ID2SubX(fID));
1.92 + }
1.93 +
1.94 + SkFixed getSubYFixed() const {
1.95 + return SubToFixed(ID2SubY(fID));
1.96 + }
1.97 +
1.98 + size_t computeImageSize() const;
1.99 +
1.100 + /** Call this to set all of the metrics fields to 0 (e.g. if the scaler
1.101 + encounters an error measuring a glyph). Note: this does not alter the
1.102 + fImage, fPath, fID, fMaskFormat fields.
1.103 + */
1.104 + void zeroMetrics();
1.105 +
1.106 + enum {
1.107 + kSubBits = 2,
1.108 + kSubMask = ((1 << kSubBits) - 1),
1.109 + kSubShift = 24, // must be large enough for glyphs and unichars
1.110 + kCodeMask = ((1 << kSubShift) - 1),
1.111 + // relative offsets for X and Y subpixel bits
1.112 + kSubShiftX = kSubBits,
1.113 + kSubShiftY = 0
1.114 + };
1.115 +
1.116 + static unsigned ID2Code(uint32_t id) {
1.117 + return id & kCodeMask;
1.118 + }
1.119 +
1.120 + static unsigned ID2SubX(uint32_t id) {
1.121 + return id >> (kSubShift + kSubShiftX);
1.122 + }
1.123 +
1.124 + static unsigned ID2SubY(uint32_t id) {
1.125 + return (id >> (kSubShift + kSubShiftY)) & kSubMask;
1.126 + }
1.127 +
1.128 + static unsigned FixedToSub(SkFixed n) {
1.129 + return (n >> (16 - kSubBits)) & kSubMask;
1.130 + }
1.131 +
1.132 + static SkFixed SubToFixed(unsigned sub) {
1.133 + SkASSERT(sub <= kSubMask);
1.134 + return sub << (16 - kSubBits);
1.135 + }
1.136 +
1.137 + static uint32_t MakeID(unsigned code) {
1.138 + return code;
1.139 + }
1.140 +
1.141 + static uint32_t MakeID(unsigned code, SkFixed x, SkFixed y) {
1.142 + SkASSERT(code <= kCodeMask);
1.143 + x = FixedToSub(x);
1.144 + y = FixedToSub(y);
1.145 + return (x << (kSubShift + kSubShiftX)) |
1.146 + (y << (kSubShift + kSubShiftY)) |
1.147 + code;
1.148 + }
1.149 +
1.150 + void toMask(SkMask* mask) const;
1.151 +};
1.152 +
1.153 +#endif
