diff -r 000000000000 -r bde4ae8d615e os/graphics/graphicsdeviceinterface/gdi/sgdi/FontArabic.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/os/graphics/graphicsdeviceinterface/gdi/sgdi/FontArabic.cpp Fri Jun 15 03:10:57 2012 +0200 @@ -0,0 +1,449 @@ +// 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 +#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(TheArabicShapeTable[left_index + KInitial]) != left || + static_cast(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(TheArabicShapeTable[right_index + KFinal]) != right || + static_cast(TheArabicShapeTable[right_index + KMedial]) != right) + suffix = TRUE; + } + } + TBool medial = static_cast(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(TheArabicShapeTable[leftIndex + KFinal]) + == aLeftCharacter) + return EFalse; + } + if (aRightCharacter == 0x640 || aRightCharacter == 0x200D) + return !leftIsFixedJoiner; + TInt rightIndex = ArabicShapeTableIndex(aRightCharacter); + return rightIndex != -1 + && static_cast(TheArabicShapeTable[rightIndex + KInitial]) + != aRightCharacter; + } +