зеркало из https://github.com/mozilla/pjs.git
329 строки
14 KiB
C
329 строки
14 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla Communicator client code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2001
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Brian Stell <bstell@netscape.com>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of the GNU General Public License Version 2 or later (the "GPL"),
|
|
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef NSCOMPRESSEDCHARMAP_H
|
|
#define NSCOMPRESSEDCHARMAP_H
|
|
#include "prtypes.h"
|
|
|
|
#define ALU_SIZE PR_BITS_PER_LONG
|
|
//#define ALU_SIZE 16
|
|
//#define ALU_SIZE 32
|
|
//#define ALU_SIZE 64
|
|
#if (ALU_SIZE==32)
|
|
# define ALU_TYPE PRUint32
|
|
# define CCMAP_POW2(n) (1L<<(n))
|
|
# define CCMAP_BITS_PER_ALU_LOG2 5
|
|
#elif (ALU_SIZE==64)
|
|
# define ALU_TYPE PRUint64
|
|
# define CCMAP_POW2(n) (1L<<(n))
|
|
# define CCMAP_BITS_PER_ALU_LOG2 6
|
|
#else
|
|
# define ALU_TYPE PRUint16
|
|
# define CCMAP_POW2(n) (1<<(n))
|
|
# define CCMAP_BITS_PER_ALU_LOG2 4
|
|
#endif
|
|
|
|
// Note: nsCompressedCharMap.cpp along with class
|
|
// nsCompressedCharMap was removed in bug 559489.
|
|
|
|
//
|
|
// nsCompressedCharMap
|
|
//
|
|
// A Compressed Char Map (CCMap) saves memory by folding all
|
|
// the empty portions of the map on top of each other.
|
|
//
|
|
// Building a Compressed Char Map (CCMap) is more complex than
|
|
// accessing it. We use the nsCompressedCharMap object to
|
|
// build the CCMap. Once nsCompressedCharMap has built the CCMap
|
|
// we get a copy of the CCMap and discard the nsCompressedCharMap
|
|
// object. The CCMap is an array of PRUint16 and is accessed by
|
|
// a macro.
|
|
//
|
|
// See "Character Map Compression" below for a discussion of
|
|
// what the array looks like.
|
|
|
|
//
|
|
// The maximum size a CCMap:
|
|
// (16 upper pointers) + (16 empty mid pointers) +
|
|
// (16 empty page) + (16*16 max mid pointers) +
|
|
// (256*16 max pages) = 4400 PRUint16
|
|
#define CCMAP_MAX_LEN (16+16+16+256+4096)
|
|
|
|
// non-bmp unicode support extension
|
|
#define EXTENDED_UNICODE_PLANES 16
|
|
|
|
//
|
|
// Character Map Compression
|
|
//
|
|
// Each font requires its own 8k charmap. On a system with 200
|
|
// fonts this would take: 200 * 8K = 1600K memory.
|
|
//
|
|
// Since most char maps are mostly empty a significant amount
|
|
// of memory can be saved by not allocating the unused sections.
|
|
//
|
|
// If the map has one or more levels of indirection then the
|
|
// the empty sections of the map can all be folded to a single
|
|
// common empty element. In this way only the non-empty sections
|
|
// need space. Because the empty sections actually point to a
|
|
// common empty section every entry in the map can be valid
|
|
// without requiring actually allocating space.
|
|
// Some larger CJK fonts have large sections where every bit
|
|
// is set. In the same way that the empty sections are folded
|
|
// onto one "empty page", the sections where all bits are set are
|
|
// folded on to one "all bits set page" .
|
|
//
|
|
// Break up the Unicode range bits 0x0000 - 0xFFFF
|
|
// into 3 bit ranges:
|
|
//
|
|
// upper bits: bit15 - bit12
|
|
// mid bits: bit11 - bit8
|
|
// page bits: bit7 - bit0
|
|
//
|
|
// within a page, (assumming a 4 byte ALU)
|
|
// bits 7-5 select one of the 8 longs
|
|
// bits 4-0 select one of the 32 bits within the long
|
|
//
|
|
// There is exactly one upper "pointers" array.
|
|
//
|
|
// The upper pointers each point to a mid array. If there are no chars
|
|
// in an upper pointer's block that pointer points to the empty mid.
|
|
// Thus all upper pointers are "valid" even if they do not have space
|
|
// allocated; eg: the accessor macro does not need to test if the
|
|
// pointer is zero.
|
|
//
|
|
// Each mid pointer in the mid array points to a page. If there are no
|
|
// chars in a mid pointer's page that pointer points to the empty page.
|
|
// Thus all mid pointers are "valid" even if they do not have space
|
|
// allocated; eg: the accessor macro does not need to test if the
|
|
// pointer is zero.
|
|
//
|
|
// Since the array will be less than 5K PRUint16 the "pointers" can
|
|
// be implemented as 2 byte offsets from the base instead of
|
|
// real pointers.
|
|
//
|
|
// the format of the CCMap is
|
|
// the upper pointers (16 PRUint16)
|
|
// the empty mid pointers (16 PRUint16)
|
|
// the empty page (16 PRUint16)
|
|
// non-empty mid pointers and pages as needed
|
|
|
|
// One minor note: for a completely empty map it is actually
|
|
// possible to fold the upper, empty mid, and empty page
|
|
// on top of each other and make a map of only 32 bytes.
|
|
#define CCMAP_EMPTY_SIZE_PER_INT16 16
|
|
|
|
// offsets to the empty mid and empty page
|
|
#define CCMAP_EMPTY_MID CCMAP_NUM_UPPER_POINTERS
|
|
#define CCMAP_EMPTY_PAGE CCMAP_EMPTY_MID+CCMAP_NUM_MID_POINTERS
|
|
|
|
//
|
|
// Because the table is offset based the code can build the table in a
|
|
// temp space (max table size on the stack) and then do one alloc of
|
|
// the actual needed size and simply copy over the data.
|
|
//
|
|
|
|
//
|
|
// Compressed Char map surrogate extension
|
|
//
|
|
// The design goal of surrogate support extension is to keep efficiency
|
|
// and compatibility of existing compressed charmap operations. Most of
|
|
// existing operation are untouched. For BMP support, very little memory
|
|
// overhead (4 bytes) is added. Runtime efficiency of BMP support is
|
|
// unchanged.
|
|
//
|
|
// structure of extended charmap:
|
|
// ccmap flag 1 PRUint16 (PRUint32) , indicates if this is extended or not
|
|
// bmp ccmap size 1 PRUint16 (PRUint32) , the size of BMP ccmap,
|
|
// BMP ccmap size varies,
|
|
// plane index 16 PRUint32, use to index ccmap for non-BMP plane
|
|
// empty ccmap 16 PRUint16, a total empty ccmap
|
|
// non-BMP ccmaps size varies, other non-empty, non-BMP ccmap
|
|
//
|
|
// Changes to basic ccmap
|
|
// 2 PRUint16 (PRUint32 on 64bit machines) are added in the very beginning.
|
|
// One is used to specify the size
|
|
// of the ccmap, the other is used as a flag. But these 2 fields are indexed
|
|
// negatively so that all other operation remain unchanged to keep efficiency.
|
|
// ccmap memory allocation is moved from nsCompressedCharMap::NewCCMap to
|
|
// MapToCCMap.
|
|
//
|
|
// Extended ccmap
|
|
// A 16*PRUint32 array was put at the end of basic ccmap, each PRUint32 either
|
|
// pointed to the empty ccmap or a independent plane ccmap. Directly after this
|
|
// array is a empty ccmap. All planes that has no character will share this ccmap.
|
|
// All non-empty plane will have a ccmap.
|
|
// "MapToCCMapExt" is added to created an extended ccmap, each plane ccmap is
|
|
// created the same as basic one, but without 2 additional fields.
|
|
// "HasGlyphExt" is used to access extended ccmap, it first need to locate the
|
|
// plane ccmap, and then operated the same way as "HasGlyph".
|
|
//
|
|
// Compatibility between old and new one
|
|
// Because extended ccmap include an exactly identical basic ccmap in its head,
|
|
// basic ccmap operation (HasGlyph) can be applied on extended ccmap without
|
|
// problem.
|
|
// Because basic ccmap is now have a flag to indicate if it is a extended one,
|
|
// Extended ccmap operation (HasGlyphExt) can check the flag before it does
|
|
// extended ccmap specific operation. So HasGlyphExt can be applied to basic ccmap
|
|
// too.
|
|
//
|
|
|
|
// Page bits
|
|
//
|
|
#define CCMAP_BITS_PER_PAGE_LOG2 8
|
|
#define CCMAP_BITS_PER_PAGE CCMAP_POW2(CCMAP_BITS_PER_PAGE_LOG2)
|
|
#define CCMAP_BIT_INDEX(c) ((c) & PR_BITMASK(CCMAP_BITS_PER_ALU_LOG2))
|
|
#define CCMAP_ALU_INDEX(c) (((c)>>CCMAP_BITS_PER_ALU_LOG2) \
|
|
& PR_BITMASK(CCMAP_BITS_PER_PAGE_LOG2 - CCMAP_BITS_PER_ALU_LOG2))
|
|
|
|
#define CCMAP_PAGE_MASK PR_BITMASK(CCMAP_BITS_PER_PAGE_LOG2)
|
|
#define CCMAP_NUM_PRUINT16S_PER_PAGE \
|
|
(CCMAP_BITS_PER_PAGE/CCMAP_BITS_PER_PRUINT16)
|
|
// one bit per char
|
|
#define CCMAP_NUM_ALUS_PER_PAGE (CCMAP_BITS_PER_PAGE/CCMAP_BITS_PER_ALU)
|
|
#define CCMAP_NUM_UCHARS_PER_PAGE CCMAP_BITS_PER_PAGE
|
|
|
|
//
|
|
// Mid bits
|
|
//
|
|
#define CCMAP_BITS_PER_MID_LOG2 4
|
|
#define CCMAP_MID_INDEX(c) \
|
|
(((c)>>CCMAP_BITS_PER_PAGE_LOG2) & PR_BITMASK(CCMAP_BITS_PER_MID_LOG2))
|
|
#define CCMAP_NUM_MID_POINTERS CCMAP_POW2(CCMAP_BITS_PER_MID_LOG2)
|
|
#define CCMAP_NUM_UCHARS_PER_MID \
|
|
CCMAP_POW2(CCMAP_BITS_PER_MID_LOG2+CCMAP_BITS_PER_PAGE_LOG2)
|
|
|
|
//
|
|
// Upper bits
|
|
//
|
|
#define CCMAP_BITS_PER_UPPER_LOG2 4
|
|
#define CCMAP_UPPER_INDEX(c) \
|
|
(((c)>>(CCMAP_BITS_PER_MID_LOG2+CCMAP_BITS_PER_PAGE_LOG2)) \
|
|
& PR_BITMASK(CCMAP_BITS_PER_UPPER_LOG2))
|
|
#define CCMAP_NUM_UPPER_POINTERS CCMAP_POW2(CCMAP_BITS_PER_UPPER_LOG2)
|
|
|
|
//
|
|
// Misc
|
|
//
|
|
#define CCMAP_BITS_PER_PRUINT16_LOG2 4
|
|
#define CCMAP_BITS_PER_PRUINT32_LOG2 5
|
|
|
|
#define CCMAP_BITS_PER_PRUINT16 CCMAP_POW2(CCMAP_BITS_PER_PRUINT16_LOG2)
|
|
#define CCMAP_BITS_PER_PRUINT32 CCMAP_POW2(CCMAP_BITS_PER_PRUINT32_LOG2)
|
|
#define CCMAP_BITS_PER_ALU CCMAP_POW2(CCMAP_BITS_PER_ALU_LOG2)
|
|
|
|
#define CCMAP_ALUS_PER_PRUINT32 (CCMAP_BITS_PER_PRUINT32/CCMAP_BITS_PER_ALU)
|
|
#define CCMAP_PRUINT32S_PER_ALU (CCMAP_BITS_PER_ALU/CCMAP_BITS_PER_PRUINT32)
|
|
#define CCMAP_PRUINT32S_PER_PAGE (CCMAP_BITS_PER_PAGE/CCMAP_BITS_PER_PRUINT32)
|
|
|
|
#define CCMAP_ALU_MASK PR_BITMASK(CCMAP_BITS_PER_ALU_LOG2)
|
|
#define CCMAP_ALUS_PER_PAGE CCMAP_POW2(CCMAP_BITS_PER_PAGE_LOG2 \
|
|
- CCMAP_BITS_PER_ALU_LOG2)
|
|
#define NUM_UNICODE_CHARS CCMAP_POW2(CCMAP_BITS_PER_UPPER_LOG2 \
|
|
+CCMAP_BITS_PER_MID_LOG2 \
|
|
+CCMAP_BITS_PER_PAGE_LOG2)
|
|
#define CCMAP_TOTAL_PAGES CCMAP_POW2(CCMAP_BITS_PER_UPPER_LOG2 \
|
|
+CCMAP_BITS_PER_MID_LOG2)
|
|
|
|
#define CCMAP_BEGIN_AT_START_OF_MAP 0xFFFFFFFF
|
|
|
|
//
|
|
// Finally, build up the macro to test the bit for a given char
|
|
//
|
|
|
|
// offset from base to mid array
|
|
#define CCMAP_TO_MID(m,c) ((m)[CCMAP_UPPER_INDEX(c)])
|
|
|
|
// offset from base to page
|
|
#define CCMAP_TO_PAGE(m,c) ((m)[CCMAP_TO_MID((m),(c)) + CCMAP_MID_INDEX(c)])
|
|
|
|
// offset from base to alu
|
|
#define CCMAP_TO_ALU(m,c) \
|
|
(*((ALU_TYPE*)(&((m)[CCMAP_TO_PAGE((m),(c))])) + CCMAP_ALU_INDEX(c)))
|
|
|
|
// test the bit
|
|
#define CCMAP_HAS_CHAR(m,c) (((CCMAP_TO_ALU(m,c))>>CCMAP_BIT_INDEX(c)) & 1)
|
|
|
|
// unset the bit
|
|
#define CCMAP_UNSET_CHAR(m,c) (CCMAP_TO_ALU(m,c) &= ~(CCMAP_POW2(CCMAP_BIT_INDEX(c))))
|
|
|
|
#define CCMAP_SIZE(m) (*((m)-1))
|
|
#define CCMAP_FLAG(m) (*((m)-2))
|
|
#define CCMAP_EXTRA (sizeof(ALU_TYPE)/sizeof(PRUint16)>2? sizeof(ALU_TYPE)/sizeof(PRUint16): 2)
|
|
#define CCMAP_SURROGATE_FLAG 0x0001
|
|
#define CCMAP_NONE_FLAG 0x0000
|
|
|
|
// get plane number from ccmap, bmp excluded, so plane 1's number is 0.
|
|
#define CCMAP_PLANE_FROM_SURROGATE(h) ((((PRUint16)(h) - (PRUint16)0xd800) >> 6) + 1)
|
|
|
|
// same as above, but get plane number from a ucs4 char
|
|
#define CCMAP_PLANE(u) ((((PRUint32)(u))>>16))
|
|
|
|
// scalar value inside the plane
|
|
#define CCMAP_INPLANE_OFFSET(h, l) (((((PRUint16)(h) - (PRUint16)0xd800) & 0x3f) << 10) + ((PRUint16)(l) - (PRUint16)0xdc00))
|
|
|
|
// get ccmap for that plane
|
|
#define CCMAP_FOR_PLANE_EXT(m, i) ((m) + ((PRUint32*)((m) + CCMAP_SIZE(m)))[(i)-1])
|
|
|
|
// test the bit for surrogate pair
|
|
#define CCMAP_HAS_CHAR_EXT2(m, h, l) (CCMAP_FLAG(m) & CCMAP_SURROGATE_FLAG && \
|
|
CCMAP_HAS_CHAR(CCMAP_FOR_PLANE_EXT((m), CCMAP_PLANE_FROM_SURROGATE(h)), CCMAP_INPLANE_OFFSET(h, l)))
|
|
// test the bit for a character in UCS4
|
|
#define CCMAP_HAS_CHAR_EXT(m, ucs4) (((ucs4)&0xffff0000) ? \
|
|
(CCMAP_FLAG(m) & CCMAP_SURROGATE_FLAG) && CCMAP_HAS_CHAR(CCMAP_FOR_PLANE_EXT((m), CCMAP_PLANE(ucs4)), (ucs4) & 0xffff) : \
|
|
CCMAP_HAS_CHAR(m, (PRUnichar)(ucs4)) )
|
|
|
|
// macros to ensure that the array defining a pre-compiled CCMap starts
|
|
// at an ALU_TYPE boundary instead of just a PRUint16 boundary.
|
|
// When invoking the macro, 'typequal' should be either 'const'
|
|
// or empty (NULL). see bug 224337.
|
|
|
|
#define DEFINE_ANY_CCMAP(var, extra, typequal) \
|
|
static typequal union { \
|
|
PRUint16 array[var ## _SIZE]; \
|
|
ALU_TYPE align; \
|
|
} var ## Union = \
|
|
{ \
|
|
{ var ## _INITIALIZER } \
|
|
}; \
|
|
static typequal PRUint16* var = var ## Union.array + extra
|
|
|
|
#define DEFINE_CCMAP(var, typequal) DEFINE_ANY_CCMAP(var, 0, typequal)
|
|
#define DEFINE_X_CCMAP(var, typequal) DEFINE_ANY_CCMAP(var, CCMAP_EXTRA, typequal)
|
|
|
|
#endif // NSCOMPRESSEDCHARMAP_H
|