--- a/graphicsdeviceinterface/gdi/sgdi/FontArabic.cpp Thu Sep 02 21:50:40 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,449 +0,0 @@
-// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
-// All rights reserved.
-// This component and the accompanying materials are made available
-// under the terms of "Eclipse Public License v1.0"
-// which accompanies this distribution, and is available
-// at the URL "http://www.eclipse.org/legal/epl-v10.html".
-//
-// Initial Contributors:
-// Nokia Corporation - initial contribution.
-//
-// Contributors:
-//
-// Description:
-//
-
-/**
- @file
- @internalComponent
-*/
-
-
-#include <gdi.h>
-#include "FontArabic.h"
-#include "GDIPANIC.h"
-
-
-//
-// Arabic Presentation Forms.
-//
-
-
-/**
- The contextual forms of each character in the range 0621 - 064A, in
- the order final, initial, medial; followed by the forms of
- the lam-alef ligatures (lam with 0622, 0623, 0625 and 0627);
- followed by the forms of the characters in the range 0671 - 06D3
-*/
-LOCAL_D const TUint16 TheArabicShapeTable[] =
- {
- // Contextual forms for standard Arabic letters
- 0x621, 0x621, 0x621, // 621
- 0xfe82, 0x622, 0x622, // 622
- 0xfe84, 0x623, 0x623, // 623
- 0xfe86, 0x624, 0x624, // 624
- 0xfe88, 0x625, 0x625, // 625
- 0xfe8a, 0xfe8b, 0xfe8c, // 626
- 0xfe8e, 0x627, 0x627, // 627
- 0xfe90, 0xfe91, 0xfe92, // 628
- 0xfe94, 0x629, 0x629, // 629
- 0xfe96, 0xfe97, 0xfe98, // 62a
- 0xfe9a, 0xfe9b, 0xfe9c, // 62b
- 0xfe9e, 0xfe9f, 0xfea0, // 62c
- 0xfea2, 0xfea3, 0xfea4, // 62d
- 0xfea6, 0xfea7, 0xfea8, // 62e
- 0xfeaa, 0x62f, 0x62f, // 62f
- 0xfeac, 0x630, 0x630, // 630
- 0xfeae, 0x631, 0x631, // 631
- 0xfeb0, 0x632, 0x632, // 632
- 0xfeb2, 0xfeb3, 0xfeb4, // 633
- 0xfeb6, 0xfeb7, 0xfeb8, // 634
- 0xfeba, 0xfebb, 0xfebc, // 635
- 0xfebe, 0xfebf, 0xfec0, // 636
- 0xfec2, 0xfec3, 0xfec4, // 637
- 0xfec6, 0xfec7, 0xfec8, // 638
- 0xfeca, 0xfecb, 0xfecc, // 639
- 0xfece, 0xfecf, 0xfed0, // 63a
- 0x63b, 0x63b, 0x63b, // placeholder
- 0x63c, 0x63c, 0x63c, // placeholder
- 0x63d, 0x63d, 0x63d, // placeholder
- 0x63e, 0x63e, 0x63e, // placeholder
- 0x63f, 0x63f, 0x63f, // placeholder
- 0x640, 0x640, 0x640, // 640
- 0xfed2, 0xfed3, 0xfed4, // 641
- 0xfed6, 0xfed7, 0xfed8, // 642
- 0xfeda, 0xfedb, 0xfedc, // 643
- 0xfede, 0xfedf, 0xfee0, // 644
- 0xfee2, 0xfee3, 0xfee4, // 645
- 0xfee6, 0xfee7, 0xfee8, // 646
- 0xfeea, 0xfeeb, 0xfeec, // 647
- 0xfeee, 0x648, 0x648, // 648
- 0xfef0, 0xfbe8, 0xfbe9, // 649
- 0xfef2, 0xfef3, 0xfef4, // 64A
-
- // Contextual forms for lam-alef ligatures
- 0xfef6, 0xfef5, 0xfef5, // 644 + 622
- 0xfef8, 0xfef7, 0xfef7, // 644 + 623
- 0xfefa, 0xfef9, 0xfef9, // 644 + 625
- 0xfefc, 0xfefb, 0xfefb, // 644 + 627
-
- // Contextual forms for extended Arabic letters for Persian, Urdu, Sindhi, etc.
- 0xfb51, 0x0671, 0x0671, // 671
- 0x0672, 0x0672, 0x0672, // placeholder
- 0x0673, 0x0673, 0x0673, // placeholder
- 0x0674, 0x0674, 0x0674, // placeholder
- 0x0675, 0x0675, 0x0675, // placeholder
- 0x0676, 0x0676, 0x0676, // placeholder
- 0x0677, 0x0677, 0x0677, // placeholder
- 0x0678, 0x0678, 0x0678, // placeholder
- 0xfb67, 0xfb68, 0xfb69, // 679
- 0xfb5f, 0xfb60, 0xfb61, // 67a
- 0xfb53, 0xfb54, 0xfb55, // 67b
- 0x067c, 0x067c, 0x067c, // placeholder
- 0x067d, 0x067d, 0x067d, // placeholder
- 0xfb57, 0xfb58, 0xfb59, // 67e
- 0xfb63, 0xfb64, 0xfb65, // 67f
-
- 0xfb5b, 0xfb5c, 0xfb5d, // 680
- 0x0681, 0x0681, 0x0681, // placeholder
- 0x0682, 0x0682, 0x0682, // placeholder
- 0xfb77, 0xfb78, 0xfb79, // 683
- 0xfb73, 0xfb74, 0xfb75, // 684
- 0x0685, 0x0685, 0x0685, // placeholder
- 0xfb7b, 0xfb7c, 0xfb7d, // 686
- 0xfb7f, 0xfb80, 0xfb81, // 687
- 0xfb89, 0x0688, 0x0688, // 688
- 0x0689, 0x0689, 0x0689, // placeholder
- 0x068a, 0x068a, 0x068a, // placeholder
- 0x068b, 0x068b, 0x068b, // placeholder
- 0xfb85, 0x068c, 0x068c, // 68c
- 0xfb83, 0x068d, 0x068d, // 68d
- 0xfb87, 0x068e, 0x068e, // 68e
- 0x068f, 0x068f, 0x068f, // placeholder
-
- 0x0690, 0x0690, 0x0690, // placeholder
- 0xfb8d, 0x0691, 0x0691, // 691
- 0x0692, 0x0692, 0x0692, // placeholder
- 0x0693, 0x0693, 0x0693, // placeholder
- 0x0694, 0x0694, 0x0694, // placeholder
- 0x0695, 0x0695, 0x0695, // placeholder
- 0x0696, 0x0696, 0x0696, // placeholder
- 0x0697, 0x0697, 0x0697, // placeholder
- 0xfb8b, 0x0698, 0x0698, // 698
- 0x0699, 0x0699, 0x0699, // placeholder
- 0x069a, 0x069a, 0x069a, // placeholder
- 0x069b, 0x069b, 0x069b, // placeholder
- 0x069c, 0x069c, 0x069c, // placeholder
- 0x069d, 0x069d, 0x069d, // placeholder
- 0x069e, 0x069e, 0x069e, // placeholder
- 0x069f, 0x069f, 0x069f, // placeholder
-
- 0x06a0, 0x06a0, 0x06a0, // placeholder
- 0x06a1, 0x06a1, 0x06a1, // placeholder
- 0x06a2, 0x06a2, 0x06a2, // placeholder
- 0x06a3, 0x06a3, 0x06a3, // placeholder
- 0xfb6b, 0xfb6c, 0xfb6d, // 6a4
- 0x06a5, 0x06a5, 0x06a5, // placeholder
- 0xfb6f, 0xfb70, 0xfb71, // 6a6
- 0x06a7, 0x06a7, 0x06a7, // placeholder
- 0x06a8, 0x06a8, 0x06a8, // placeholder
- 0xfb8f, 0xfb90, 0xfb91, // 6a9
- 0x06aa, 0x06aa, 0x06aa, // 6aa
- 0x06ab, 0x06ab, 0x06ab, // 6ab
- 0x06ac, 0x06ac, 0x06ac, // 6ac
- 0xfbd4, 0xfbd5, 0xfbd6, // 6ad
- 0x06ae, 0x06ae, 0x06ae, // 6ae
- 0xfb93, 0xfb94, 0xfb95, // 6af
-
- 0x06b0, 0x06b0, 0x06b0, // placeholder
- 0xfb9b, 0xfb9c, 0xfb9d, // 6b1
- 0x06b2, 0x06b2, 0x06b2, // 6b2
- 0xfb97, 0xfb98, 0xfb99, // 6b3
- 0x06b4, 0x06b4, 0x06b4, // placeholder
- 0x06b5, 0x06b5, 0x06b5, // placeholder
- 0x06b6, 0x06b6, 0x06b6, // placeholder
- 0x06b7, 0x06b7, 0x06b7, // placeholder
- 0x06b8, 0x06b8, 0x06b8, // placeholder
- 0x06b9, 0x06b9, 0x06b9, // placeholder
- 0xfb9f, 0x06ba, 0x06ba, // 6ba
- 0xfba1, 0xfba2, 0xfba3, // 6bb
- 0x06bc, 0x06bc, 0x06bc, // placeholder
- 0x06bd, 0x06bd, 0x06bd, // placeholder
- 0xfbab, 0xfbac, 0xfbad, // 6be
- 0x06bf, 0x06bf, 0x06bf, // placeholder
-
- 0xfba5, 0x06c0, 0x06c0, // 6c0
- 0xfba7, 0xfba8, 0xfba9, // 6c1
- 0x06c2, 0x06c2, 0x06c2, // placeholder
- 0x06c3, 0x06c3, 0x06c3, // placeholder
- 0x06c4, 0x06c4, 0x06c4, // placeholder
- 0xfbe1, 0x06c5, 0x06c5, // 6c5
- 0xfbda, 0x06c6, 0x06c6, // 6c6
- 0xfbd8, 0x06c7, 0x06c7, // 6c7
- 0xfbdc, 0x06c8, 0x06c8, // 6c8
- 0xfbe3, 0x06c9, 0x06c9, // 6c9
- 0x06ca, 0x06ca, 0x06ca, // placeholder
- 0xfbdf, 0x06cb, 0x06cb, // 6cb
- 0xfbfd, 0xfbfe, 0xfbff, // 6cc
- 0x06cd, 0x06cd, 0x06cd, // placeholder
- 0x06ce, 0x06ce, 0x06ce, // placeholder
- 0x06cf, 0x06cf, 0x06cf, // placeholder
-
- 0xfbe5, 0xfbe6, 0xfbe7, // 6d0
- 0x06d1, 0x06d1, 0x06d1, // placeholder
- 0xfbaf, 0x06d2, 0x06d2, // 6d2
- 0xfbb1, 0x06d3, 0x06d3 // 6d3
- };
-
-
-static const int KFinal = 0;
-static const int KInitial = 1;
-static const int KMedial = 2;
-static const int KStandardShapeTableOffset = 0x621;
-static const int KLamAlefShapeTableStart = 0x64B - 0x621;
-static const int KExtendedShapeTableOffset = 0x671 - (0x64f - 0x621);
-
-
-static inline TInt ArabicShapeTableIndex(TInt aCode)
- {
- if (aCode >= 0x621 && aCode <= 0x64a)
- return (aCode - KStandardShapeTableOffset) * 3;
- if (aCode >= 0x671 && aCode <= 0x6d3)
- return (aCode - KExtendedShapeTableOffset) * 3;
- return KErrNotFound;
- }
-
-
-static inline TBool IsArabicPoint(TInt aCode)
- {
- return (aCode >= 0x64B && aCode <= 0x655) || aCode == 0x670;
- }
-
-TInt ConsumeCharsAndDeterminePresentationForm(const TUtf32Iterator& aText,
- TUint aFlags, TInt& aLigaturePortionsRemaining)
-/**
- Get the Arabic or other presentation form, consuming as many characters
- as necessary. This function can cope with text that has already been
- reversed.
-@internalComponent
-*/
- {
- TUint c = aText.Get();
- TInt index = ArabicShapeTableIndex(c);
- if (index != -1)
- {
- if (aLigaturePortionsRemaining != 0)
- {
- --aLigaturePortionsRemaining;
- GDI_ASSERT_DEBUG(!aText.AtEnd(), EGdiPanic_Invariant);
- return 0xFFFF;
- }
-
- int position = -1;
-
- // Find previous and next character, skipping Arabic points.
- TUtf32Iterator tmpText(aText);
- tmpText.Prev();
- TUint prev = 0xFFFF;
- while (!tmpText.BeforeStart() && (prev == 0xFFFF || IsArabicPoint(prev)))
- prev = tmpText.GetThenPrev();
-
- tmpText = aText;
- tmpText.Next();
- TUint next = 0xFFFF;
- while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next)))
- next = tmpText.GetThenNext();
-
- TInt possible_lam = (aFlags & CFont::TPositionParam::EFLogicalOrder)?
- c : next;
- TInt possible_alef = (aFlags & CFont::TPositionParam::EFLogicalOrder)?
- next : c;
-
- // Perform lam-alef ligation if necessary.
- if (possible_lam == 0x644 &&
- (possible_alef == 0x622 || possible_alef == 0x623 || possible_alef == 0x625 || possible_alef == 0x627))
- {
- switch(possible_alef)
- {
- case 0x622:
- {
- c = 0xfef5;
- index = KLamAlefShapeTableStart;
- break;
- }
- case 0x623:
- {
- c = 0xfef7;
- index = KLamAlefShapeTableStart + 1;
- break;
- }
- case 0x625:
- {
- c = 0xfef9;
- index = KLamAlefShapeTableStart + 2;
- break;
- }
- default:
- {
- c = 0xfefb;
- index = KLamAlefShapeTableStart + 3;
- }
- }
- index *= 3;
- aLigaturePortionsRemaining = 2;
-
- next = 0xFFFF;
- while (!tmpText.AtEnd() && (next == 0xFFFF || IsArabicPoint(next)))
- {
- next = tmpText.Get();
- tmpText.Next();
- }
- }
-
- TInt left = (aFlags & CFont::TPositionParam::EFLogicalOrder)? prev : next;
- TInt right = (aFlags & CFont::TPositionParam::EFLogicalOrder)? next : prev;
-
- TBool prefix = FALSE;
- if (left == 0x640 || left == 0x200D) // kashida or Zero-Width Joiner
- prefix = TRUE;
- else
- {
- TInt left_index = ArabicShapeTableIndex(left);
- if (left_index != -1)
- {
- if (static_cast<TInt>(TheArabicShapeTable[left_index + KInitial]) != left ||
- static_cast<TInt>(TheArabicShapeTable[left_index + KMedial]) != left)
- prefix = TRUE;
- }
- }
- TBool suffix = FALSE;
- if (right == 0x640 || right == 0x200D) // kashida or Zero-Width Joiner
- suffix = TRUE;
- else
- {
- TInt right_index = ArabicShapeTableIndex(right);
- if (right_index != -1)
- {
- if (static_cast<TInt>(TheArabicShapeTable[right_index + KFinal]) != right ||
- static_cast<TInt>(TheArabicShapeTable[right_index + KMedial]) != right)
- suffix = TRUE;
- }
- }
- TBool medial = static_cast<TUint>(TheArabicShapeTable[index + KMedial]) != c;
- if (medial)
- {
- if (prefix && suffix)
- position = KMedial;
- else if (prefix)
- position = KFinal;
- else if (suffix)
- position = KInitial;
- }
- else
- {
- if (prefix)
- position = KFinal;
- else if (suffix)
- position = KInitial;
- }
- if (position >= 0)
- c = TheArabicShapeTable[index + position];
- }
-
- return c;
- }
-
-
-//
-//
-// GlyphSelector_Arabic Class definition
-//
-//
-
-TBool GlyphSelector_Arabic::Process(TGlyphSelectionState& aGss, RShapeInfo&)
- {
- // Select glyph - use presentation form if applicable.
- TInt ligaturePortions = aGss.iLigaturePortionsRemaining;
- TUint flags = aGss.iParam.iFlags;
- TUint code = ConsumeCharsAndDeterminePresentationForm(aGss.iText,
- flags, ligaturePortions);
-
- aGss.iText.Next();
- aGss.iClusterState = !aGss.iText.AtEnd() &&
- (aGss.iText.Get().GetCategory() & 0xF0) == TChar::EMarkGroup?
- TGlyphSelectionState::EGClusterNotComplete
- : TGlyphSelectionState::EGClusterComplete;
-
- // If we are beginning a new portion of a ligature, we must set the state.
- if (ligaturePortions != aGss.iLigaturePortionsRemaining)
- {
- if (ligaturePortions != 1)
- aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete;
- aGss.iLigaturePortionFirstMark = aGss.iParam.iOutputGlyphs;
- if (ligaturePortions < aGss.iLigaturePortionsRemaining)
- {
- aGss.iLigaturePortionsRemaining = ligaturePortions;
- // We have just swallowed a non-initial part of the ligature, which
- // must not be drawn.
- GDI_ASSERT_DEBUG(code == 0xFFFF, EGdiPanic_Invariant);
- return ETrue;
- }
- aGss.iLigaturePortionsRemaining = ligaturePortions;
- }
-
- // In this method we always output the glyph code calculate previously.
- if (!aGss.AppendGlyphToCluster(code))
- return EFalse;
-
- if (!aGss.IsCombiningClass())
- {
- aGss.iPen = TGlyphSelectionState::EPenAdvance_Yes;
- return ETrue;
- }
-
- // Adjust glyph's bounds further to position this character.
- aGss.iPen = TGlyphSelectionState::EPenAdvance_No;
- TRect baseBounds = aGss.iParam.iOutput[0].iBounds;
- TInt firstMark = 1;
- if (aGss.iLigaturePortionsRemaining != 0)
- {
- TInt centre = (baseBounds.iBr.iX + baseBounds.iTl.iX) >> 1;
- TBool firstHalf = aGss.iLigaturePortionsRemaining == 2;
- TBool rightHandSide = flags & CFont::TPositionParam::EFLogicalOrder?
- firstHalf : !firstHalf;
- if (rightHandSide)
- baseBounds.iTl.iX = centre;
- else
- baseBounds.iBr.iX = centre;
- if (firstHalf)
- aGss.iClusterState = TGlyphSelectionState::EGClusterNotComplete;
- firstMark = aGss.iLigaturePortionFirstMark;
- }
- aGss.CombineLastGlyphToBase(baseBounds, firstMark);
-
- return ETrue;
- }
-
-
-TBool GlyphSelector_Arabic::CharactersJoin(TInt aLeftCharacter, TInt aRightCharacter)
- {
- // All the characters join to the right, so we don't need to look them up.
- // as long as they are there at all, it is OK.
- TBool leftIsFixedJoiner = aLeftCharacter == 0x640 || aLeftCharacter == 0x200D;
- if (!leftIsFixedJoiner)
- {
- TInt leftIndex = ArabicShapeTableIndex(aLeftCharacter);
- if (leftIndex == -1)
- return EFalse;
- if (static_cast<TInt>(TheArabicShapeTable[leftIndex + KFinal])
- == aLeftCharacter)
- return EFalse;
- }
- if (aRightCharacter == 0x640 || aRightCharacter == 0x200D)
- return !leftIsFixedJoiner;
- TInt rightIndex = ArabicShapeTableIndex(aRightCharacter);
- return rightIndex != -1
- && static_cast<TInt>(TheArabicShapeTable[rightIndex + KInitial])
- != aRightCharacter;
- }
-