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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <vector>
#include <sal/types.h>
#include <swfont.hxx>
#include "justify.hxx"
namespace
{
enum class IdeographicPunctuationClass
{
NONE,
OPEN_BRACKET,
CLOSE_BRACKET,
COMMA_OR_FULLSTOP
};
IdeographicPunctuationClass lcl_WhichPunctuationClass(sal_Unicode cChar)
{
if ((cChar < 0x3001 || cChar > 0x3002) && (cChar < 0x3008 || cChar > 0x3011)
&& (cChar < 0x3014 || cChar > 0x301F) && 0xFF62 != cChar && 0xFF63 != cChar)
return IdeographicPunctuationClass::NONE;
else if (0x3001 == cChar || 0x3002 == cChar)
return IdeographicPunctuationClass::COMMA_OR_FULLSTOP;
else if (0x3009 == cChar || 0x300B == cChar || 0x300D == cChar || 0x300F == cChar
|| 0x3011 == cChar || 0x3015 == cChar || 0x3017 == cChar || 0x3019 == cChar
|| 0x301B == cChar || 0x301E == cChar || 0x301F == cChar || 0xFF63 == cChar)
// right punctuation
return IdeographicPunctuationClass::CLOSE_BRACKET;
return IdeographicPunctuationClass::OPEN_BRACKET;
}
tools::Long lcl_MinGridWidth(tools::Long nGridWidth, tools::Long nCharWidth)
{
tools::Long nCount = nCharWidth > nGridWidth ? (nCharWidth - 1) / nGridWidth + 1 : 1;
return nCount * nGridWidth;
}
tools::Long lcl_OffsetFromGridEdge(tools::Long nMinWidth, tools::Long nCharWidth, sal_Unicode cChar,
bool bForceLeft)
{
if (bForceLeft)
return 0;
tools::Long nOffset = 0;
switch (lcl_WhichPunctuationClass(cChar))
{
case IdeographicPunctuationClass::NONE:
// Centered
nOffset = (nMinWidth - nCharWidth) / 2;
break;
case IdeographicPunctuationClass::OPEN_BRACKET:
// Align to next edge, closer to next ideograph
nOffset = nMinWidth - nCharWidth;
break;
default:
// CLOSE_BRACKET or COMMA_OR_FULLSTOP:
// Align to previous edge, closer to previous ideograph.
break;
}
return nOffset;
}
}
namespace Justify
{
sal_Int32 GetModelPosition(const std::vector<sal_Int32>& rKernArray, sal_Int32 nLen, tools::Long nX)
{
tools::Long nLeft = 0, nRight = 0;
sal_Int32 nLast = 0, nIdx = 0;
do
{
nRight = rKernArray[nLast];
++nIdx;
while (nIdx < nLen && rKernArray[nIdx] == rKernArray[nLast])
++nIdx;
if (nIdx < nLen)
{
if (nX < nRight)
return (nX - nLeft < nRight - nX) ? nLast : nIdx;
nLeft = nRight;
nLast = nIdx;
}
} while (nIdx < nLen);
return nIdx;
}
void SpaceDistribution(std::vector<sal_Int32>& rKernArray, const OUString& rText, sal_Int32 nStt,
sal_Int32 nLen, tools::Long nSpaceAdd, tools::Long nKern, bool bNoHalfSpace)
{
assert(nStt + nLen <= rText.getLength());
assert(nLen <= sal_Int32(rKernArray.size()));
// nSpaceSum contains the sum of the intermediate space distributed
// among Spaces by the Justification.
// The Spaces themselves will be positioned in the middle of the
// intermediate space, hence the nSpace/2.
// In case of word-by-word underlining they have to be positioned
// at the beginning of the intermediate space, so that the space
// is not underlined.
// A Space at the beginning or end of the text must be positioned
// before (resp. after) the whole intermediate space, otherwise
// the underline/strike-through would have gaps.
tools::Long nSpaceSum = 0;
// in word line mode and for Arabic, we disable the half space trick:
const tools::Long nHalfSpace = bNoHalfSpace ? 0 : nSpaceAdd / 2;
const tools::Long nOtherHalf = nSpaceAdd - nHalfSpace;
tools::Long nKernSum = nKern;
sal_Unicode cChPrev = rText[nStt];
if (nSpaceAdd && (cChPrev == CH_BLANK))
nSpaceSum = nHalfSpace;
sal_Int32 nPrevIdx = 0;
for (sal_Int32 i = 1; i < nLen; ++i, nKernSum += nKern)
{
// Find the beginning of the next cluster that has a different kern value.
while (i < nLen && rKernArray[i] == rKernArray[nPrevIdx])
++i;
if (i == nLen)
break;
sal_Unicode nCh = rText[nStt + i];
// Apply SpaceSum
if (cChPrev == CH_BLANK)
{
// no Pixel is lost:
nSpaceSum += nOtherHalf;
}
if (nCh == CH_BLANK)
{
if (i + 1 == nLen)
nSpaceSum += nSpaceAdd;
else
nSpaceSum += nHalfSpace;
}
cChPrev = nCh;
rKernArray[nPrevIdx] += nKernSum + nSpaceSum;
// In word line mode and for Arabic, we disabled the half space trick. If a portion
// ends with a blank, the full nSpaceAdd value has been added to the character in
// front of the blank. This leads to painting artifacts, therefore we remove the
// nSpaceAdd value again:
if (bNoHalfSpace && i + 1 == nLen && nCh == CH_BLANK)
rKernArray[nPrevIdx] = rKernArray[nPrevIdx] - nSpaceAdd;
// Advance nPrevIdx and assign kern values to previous cluster.
for (tools::Long nValue = rKernArray[nPrevIdx++]; nPrevIdx < i; ++nPrevIdx)
rKernArray[nPrevIdx] = nValue;
}
// the layout engine requires the total width of the output
while (nPrevIdx < nLen)
rKernArray[nPrevIdx++] += nKernSum + nSpaceSum;
}
tools::Long SnapToGrid(std::vector<sal_Int32>& rKernArray, const OUString& rText, sal_Int32 nStt,
sal_Int32 nLen, tools::Long nGridWidth, bool bForceLeft)
{
assert(nStt + nLen <= rText.getLength());
assert(nLen <= sal_Int32(rKernArray.size()));
tools::Long nCharWidth = rKernArray[0];
tools::Long nMinWidth = lcl_MinGridWidth(nGridWidth, nCharWidth);
tools::Long nDelta = lcl_OffsetFromGridEdge(nMinWidth, nCharWidth, rText[nStt], bForceLeft);
tools::Long nEdge = nMinWidth - nDelta;
sal_Int32 nLast = 0;
for (sal_Int32 i = 1; i < nLen; ++i)
{
if (rKernArray[i] == rKernArray[nLast])
continue;
nCharWidth = rKernArray[i] - rKernArray[nLast];
nMinWidth = lcl_MinGridWidth(nGridWidth, nCharWidth);
tools::Long nX
= nEdge + lcl_OffsetFromGridEdge(nMinWidth, nCharWidth, rText[nStt + i], bForceLeft);
nEdge += nMinWidth;
while (nLast < i)
rKernArray[nLast++] = nX;
}
while (nLast < nLen)
rKernArray[nLast++] = nEdge;
return nDelta;
}
void SnapToGridEdge(std::vector<sal_Int32>& rKernArray, sal_Int32 nLen, tools::Long nGridWidth,
tools::Long nSpace, tools::Long nKern)
{
assert(nLen <= sal_Int32(rKernArray.size()));
tools::Long nCharWidth = rKernArray[0];
tools::Long nEdge = lcl_MinGridWidth(nGridWidth, nCharWidth + nKern) + nSpace;
sal_Int32 nLast = 0;
for (sal_Int32 i = 1; i < nLen; ++i)
{
if (rKernArray[i] == rKernArray[nLast])
continue;
nCharWidth = rKernArray[i] - rKernArray[nLast];
tools::Long nMinWidth = lcl_MinGridWidth(nGridWidth, nCharWidth + nKern);
while (nLast < i)
rKernArray[nLast++] = nEdge;
nEdge += nMinWidth + nSpace;
}
while (nLast < nLen)
rKernArray[nLast++] = nEdge;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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