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gfx/skia/trunk/src/core/SkGlyph.h@6474c204b198 (annotated)

gfx/skia/trunk/src/core/SkGlyph.h

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/*
michael@0	2	* Copyright 2006 The Android Open Source Project
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license that can be
michael@0	5	* found in the LICENSE file.
michael@0	6	*/
michael@0	7
michael@0	8	#ifndef SkGlyph_DEFINED
michael@0	9	#define SkGlyph_DEFINED
michael@0	10
michael@0	11	#include "SkTypes.h"
michael@0	12	#include "SkFixed.h"
michael@0	13	#include "SkMask.h"
michael@0	14
michael@0	15	class SkPath;
michael@0	16
michael@0	17	// needs to be != to any valid SkMask::Format
michael@0	18	#define MASK_FORMAT_UNKNOWN (0xFF)
michael@0	19	#define MASK_FORMAT_JUST_ADVANCE MASK_FORMAT_UNKNOWN
michael@0	20
michael@0	21	#define kMaxGlyphWidth (1<<13)
michael@0	22
michael@0	23	struct SkGlyph {
michael@0	24	void* fImage;
michael@0	25	SkPath* fPath;
michael@0	26	SkFixed fAdvanceX, fAdvanceY;
michael@0	27
michael@0	28	uint32_t fID;
michael@0	29	uint16_t fWidth, fHeight;
michael@0	30	int16_t fTop, fLeft;
michael@0	31
michael@0	32	uint8_t fMaskFormat;
michael@0	33	int8_t fRsbDelta, fLsbDelta; // used by auto-kerning
michael@0	34
michael@0	35	void init(uint32_t id) {
michael@0	36	fID = id;
michael@0	37	fImage = NULL;
michael@0	38	fPath = NULL;
michael@0	39	fMaskFormat = MASK_FORMAT_UNKNOWN;
michael@0	40	}
michael@0	41
michael@0	42	/**
michael@0	43	* Compute the rowbytes for the specified width and mask-format.
michael@0	44	*/
michael@0	45	static unsigned ComputeRowBytes(unsigned width, SkMask::Format format) {
michael@0	46	unsigned rb = width;
michael@0	47	if (SkMask::kBW_Format == format) {
michael@0	48	rb = (rb + 7) >> 3;
michael@0	49	} else if (SkMask::kARGB32_Format == format ||
michael@0	50	SkMask::kLCD32_Format == format)
michael@0	51	{
michael@0	52	rb <<= 2;
michael@0	53	} else if (SkMask::kLCD16_Format == format) {
michael@0	54	rb = SkAlign4(rb << 1);
michael@0	55	} else {
michael@0	56	rb = SkAlign4(rb);
michael@0	57	}
michael@0	58	return rb;
michael@0	59	}
michael@0	60
michael@0	61	unsigned rowBytes() const {
michael@0	62	return ComputeRowBytes(fWidth, (SkMask::Format)fMaskFormat);
michael@0	63	}
michael@0	64
michael@0	65	bool isJustAdvance() const {
michael@0	66	return MASK_FORMAT_JUST_ADVANCE == fMaskFormat;
michael@0	67	}
michael@0	68
michael@0	69	bool isFullMetrics() const {
michael@0	70	return MASK_FORMAT_JUST_ADVANCE != fMaskFormat;
michael@0	71	}
michael@0	72
michael@0	73	uint16_t getGlyphID() const {
michael@0	74	return ID2Code(fID);
michael@0	75	}
michael@0	76
michael@0	77	unsigned getGlyphID(unsigned baseGlyphCount) const {
michael@0	78	unsigned code = ID2Code(fID);
michael@0	79	SkASSERT(code >= baseGlyphCount);
michael@0	80	return code - baseGlyphCount;
michael@0	81	}
michael@0	82
michael@0	83	unsigned getSubX() const {
michael@0	84	return ID2SubX(fID);
michael@0	85	}
michael@0	86
michael@0	87	SkFixed getSubXFixed() const {
michael@0	88	return SubToFixed(ID2SubX(fID));
michael@0	89	}
michael@0	90
michael@0	91	SkFixed getSubYFixed() const {
michael@0	92	return SubToFixed(ID2SubY(fID));
michael@0	93	}
michael@0	94
michael@0	95	size_t computeImageSize() const;
michael@0	96
michael@0	97	/** Call this to set all of the metrics fields to 0 (e.g. if the scaler
michael@0	98	encounters an error measuring a glyph). Note: this does not alter the
michael@0	99	fImage, fPath, fID, fMaskFormat fields.
michael@0	100	*/
michael@0	101	void zeroMetrics();
michael@0	102
michael@0	103	enum {
michael@0	104	kSubBits = 2,
michael@0	105	kSubMask = ((1 << kSubBits) - 1),
michael@0	106	kSubShift = 24, // must be large enough for glyphs and unichars
michael@0	107	kCodeMask = ((1 << kSubShift) - 1),
michael@0	108	// relative offsets for X and Y subpixel bits
michael@0	109	kSubShiftX = kSubBits,
michael@0	110	kSubShiftY = 0
michael@0	111	};
michael@0	112
michael@0	113	static unsigned ID2Code(uint32_t id) {
michael@0	114	return id & kCodeMask;
michael@0	115	}
michael@0	116
michael@0	117	static unsigned ID2SubX(uint32_t id) {
michael@0	118	return id >> (kSubShift + kSubShiftX);
michael@0	119	}
michael@0	120
michael@0	121	static unsigned ID2SubY(uint32_t id) {
michael@0	122	return (id >> (kSubShift + kSubShiftY)) & kSubMask;
michael@0	123	}
michael@0	124
michael@0	125	static unsigned FixedToSub(SkFixed n) {
michael@0	126	return (n >> (16 - kSubBits)) & kSubMask;
michael@0	127	}
michael@0	128
michael@0	129	static SkFixed SubToFixed(unsigned sub) {
michael@0	130	SkASSERT(sub <= kSubMask);
michael@0	131	return sub << (16 - kSubBits);
michael@0	132	}
michael@0	133
michael@0	134	static uint32_t MakeID(unsigned code) {
michael@0	135	return code;
michael@0	136	}
michael@0	137
michael@0	138	static uint32_t MakeID(unsigned code, SkFixed x, SkFixed y) {
michael@0	139	SkASSERT(code <= kCodeMask);
michael@0	140	x = FixedToSub(x);
michael@0	141	y = FixedToSub(y);
michael@0	142	return (x << (kSubShift + kSubShiftX)) |
michael@0	143	(y << (kSubShift + kSubShiftY)) |
michael@0	144	code;
michael@0	145	}
michael@0	146
michael@0	147	void toMask(SkMask* mask) const;
michael@0	148	};
michael@0	149
michael@0	150	#endif