Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 343 insertions, 0 deletions

diff --git a/vcl/source/text/ImplLayoutArgs.cxx b/vcl/source/text/ImplLayoutArgs.cxx
new file mode 100644
index 000000000..dbdc6e18f
--- /dev/null
+++ b/vcl/source/text/ImplLayoutArgs.cxx
@@ -0,0 +1,343 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <ImplLayoutArgs.hxx>
+
+#include <unicode/ubidi.h>
+#include <unicode/uchar.h>
+
+#include <algorithm>
+#include <memory>
+
+namespace vcl::text
+{
+ImplLayoutArgs::ImplLayoutArgs(const OUString& rStr, int nMinCharPos, int nEndCharPos,
+                               SalLayoutFlags nFlags, const LanguageTag& rLanguageTag,
+                               vcl::text::TextLayoutCache const* const pLayoutCache)
+    : maLanguageTag(rLanguageTag)
+    , mnFlags(nFlags)
+    , mrStr(rStr)
+    , mnMinCharPos(nMinCharPos)
+    , mnEndCharPos(nEndCharPos)
+    , m_pTextLayoutCache(pLayoutCache)
+    , mpDXArray(nullptr)
+    , mpAltNaturalDXArray(nullptr)
+    , mnLayoutWidth(0)
+    , mnOrientation(0)
+{
+    if (mnFlags & SalLayoutFlags::BiDiStrong)
+    {
+        // handle strong BiDi mode
+
+        // do not bother to BiDi analyze strong LTR/RTL
+        // TODO: can we assume these strings do not have unicode control chars?
+        //       if not remove the control characters from the runs
+        bool bRTL(mnFlags & SalLayoutFlags::BiDiRtl);
+        AddRun(mnMinCharPos, mnEndCharPos, bRTL);
+    }
+    else
+    {
+        // handle weak BiDi mode
+        UBiDiLevel nLevel = (mnFlags & SalLayoutFlags::BiDiRtl) ? 1 : 0;
+
+        // prepare substring for BiDi analysis
+        // TODO: reuse allocated pParaBidi
+        UErrorCode rcI18n = U_ZERO_ERROR;
+        const int nLength = mnEndCharPos - mnMinCharPos;
+        UBiDi* pParaBidi = ubidi_openSized(nLength, 0, &rcI18n);
+        if (!pParaBidi)
+            return;
+        ubidi_setPara(pParaBidi, reinterpret_cast<const UChar*>(mrStr.getStr()) + mnMinCharPos,
+                      nLength, nLevel, nullptr, &rcI18n);
+
+        // run BiDi algorithm
+        const int nRunCount = ubidi_countRuns(pParaBidi, &rcI18n);
+        for (int i = 0; i < nRunCount; ++i)
+        {
+            int32_t nMinPos, nRunLength;
+            const UBiDiDirection nDir = ubidi_getVisualRun(pParaBidi, i, &nMinPos, &nRunLength);
+            const int nPos0 = nMinPos + mnMinCharPos;
+            const int nPos1 = nPos0 + nRunLength;
+
+            const bool bRTL = (nDir == UBIDI_RTL);
+            AddRun(nPos0, nPos1, bRTL);
+        }
+
+        // cleanup BiDi engine
+        ubidi_close(pParaBidi);
+    }
+
+    // prepare calls to GetNextPos/GetNextRun
+    maRuns.ResetPos();
+}
+
+void ImplLayoutArgs::SetLayoutWidth(DeviceCoordinate nWidth) { mnLayoutWidth = nWidth; }
+
+void ImplLayoutArgs::SetDXArray(DeviceCoordinate const* pDXArray) { mpDXArray = pDXArray; }
+
+void ImplLayoutArgs::SetAltNaturalDXArray(double const* pDXArray)
+{
+    mpAltNaturalDXArray = pDXArray;
+}
+
+void ImplLayoutArgs::SetOrientation(Degree10 nOrientation) { mnOrientation = nOrientation; }
+
+void ImplLayoutArgs::ResetPos() { maRuns.ResetPos(); }
+
+bool ImplLayoutArgs::GetNextPos(int* nCharPos, bool* bRTL)
+{
+    return maRuns.GetNextPos(nCharPos, bRTL);
+}
+
+void ImplLayoutArgs::AddFallbackRun(int nMinRunPos, int nEndRunPos, bool bRTL)
+{
+    maFallbackRuns.AddRun(nMinRunPos, nEndRunPos, bRTL);
+}
+
+bool ImplLayoutArgs::HasFallbackRun() const { return !maFallbackRuns.IsEmpty(); }
+
+static bool IsControlChar(sal_UCS4 cChar)
+{
+    // C0 control characters
+    if ((0x0001 <= cChar) && (cChar <= 0x001F))
+        return true;
+    // formatting characters
+    if ((0x200E <= cChar) && (cChar <= 0x200F))
+        return true;
+    if ((0x2028 <= cChar) && (cChar <= 0x202E))
+        return true;
+    // deprecated formatting characters
+    if ((0x206A <= cChar) && (cChar <= 0x206F))
+        return true;
+    if (0x2060 == cChar)
+        return true;
+    // byte order markers and invalid unicode
+    if ((cChar == 0xFEFF) || (cChar == 0xFFFE) || (cChar == 0xFFFF))
+        return true;
+    // drop null character too, broken documents may contain it (ofz34898-1.doc)
+    if (cChar == 0)
+        return true;
+    return false;
+}
+
+// add a run after splitting it up to get rid of control chars
+void ImplLayoutArgs::AddRun(int nCharPos0, int nCharPos1, bool bRTL)
+{
+    SAL_WARN_IF(nCharPos0 > nCharPos1, "vcl", "ImplLayoutArgs::AddRun() nCharPos0>=nCharPos1");
+
+    // remove control characters from runs by splitting them up
+    if (!bRTL)
+    {
+        for (int i = nCharPos0; i < nCharPos1; ++i)
+            if (IsControlChar(mrStr[i]))
+            {
+                // add run until control char
+                maRuns.AddRun(nCharPos0, i, bRTL);
+                nCharPos0 = i + 1;
+            }
+    }
+    else
+    {
+        for (int i = nCharPos1; --i >= nCharPos0;)
+            if (IsControlChar(mrStr[i]))
+            {
+                // add run until control char
+                maRuns.AddRun(i + 1, nCharPos1, bRTL);
+                nCharPos1 = i;
+            }
+    }
+
+    // add remainder of run
+    maRuns.AddRun(nCharPos0, nCharPos1, bRTL);
+}
+
+bool ImplLayoutArgs::PrepareFallback(const SalLayoutGlyphsImpl* pGlyphsImpl)
+{
+    // Generate runs with pre-calculated glyph items instead maFallbackRuns.
+    if (pGlyphsImpl != nullptr)
+    {
+        maRuns.Clear();
+        maFallbackRuns.Clear();
+
+        for (auto const& aGlyphItem : *pGlyphsImpl)
+        {
+            for (int i = aGlyphItem.charPos(); i < aGlyphItem.charPos() + aGlyphItem.charCount();
+                 ++i)
+                maRuns.AddPos(i, aGlyphItem.IsRTLGlyph());
+        }
+
+        return !maRuns.IsEmpty();
+    }
+
+    // short circuit if no fallback is needed
+    if (maFallbackRuns.IsEmpty())
+    {
+        maRuns.Clear();
+        return false;
+    }
+
+    // convert the fallback requests to layout requests
+    bool bRTL;
+    int nMin, nEnd;
+
+    // get the individual fallback requests
+    std::vector<int> aPosVector;
+    aPosVector.reserve(mrStr.getLength());
+    maFallbackRuns.ResetPos();
+    for (; maFallbackRuns.GetRun(&nMin, &nEnd, &bRTL); maFallbackRuns.NextRun())
+        for (int i = nMin; i < nEnd; ++i)
+            aPosVector.push_back(i);
+    maFallbackRuns.Clear();
+
+    // sort the individual fallback requests
+    std::sort(aPosVector.begin(), aPosVector.end());
+
+    // adjust fallback runs to have the same order and limits of the original runs
+    ImplLayoutRuns aNewRuns;
+    maRuns.ResetPos();
+    for (; maRuns.GetRun(&nMin, &nEnd, &bRTL); maRuns.NextRun())
+    {
+        if (!bRTL)
+        {
+            auto it = std::lower_bound(aPosVector.begin(), aPosVector.end(), nMin);
+            for (; (it != aPosVector.end()) && (*it < nEnd); ++it)
+                aNewRuns.AddPos(*it, bRTL);
+        }
+        else
+        {
+            auto it = std::upper_bound(aPosVector.begin(), aPosVector.end(), nEnd);
+            while ((it != aPosVector.begin()) && (*--it >= nMin))
+                aNewRuns.AddPos(*it, bRTL);
+        }
+    }
+
+    maRuns = aNewRuns; // TODO: use vector<>::swap()
+    maRuns.ResetPos();
+    return true;
+}
+
+bool ImplLayoutArgs::GetNextRun(int* nMinRunPos, int* nEndRunPos, bool* bRTL)
+{
+    bool bValid = maRuns.GetRun(nMinRunPos, nEndRunPos, bRTL);
+    maRuns.NextRun();
+    return bValid;
+}
+}
+
+std::ostream& operator<<(std::ostream& s, vcl::text::ImplLayoutArgs const& rArgs)
+{
+#ifndef SAL_LOG_INFO
+    (void)rArgs;
+#else
+    s << "ImplLayoutArgs{";
+
+    s << "Flags=";
+    if (rArgs.mnFlags == SalLayoutFlags::NONE)
+        s << 0;
+    else
+    {
+        bool need_or = false;
+        s << "{";
+#define TEST(x)                                                                                    \
+    if (rArgs.mnFlags & SalLayoutFlags::x)                                                         \
+    {                                                                                              \
+        if (need_or)                                                                               \
+            s << "|";                                                                              \
+        s << #x;                                                                                   \
+        need_or = true;                                                                            \
+    }
+        TEST(BiDiRtl);
+        TEST(BiDiStrong);
+        TEST(RightAlign);
+        TEST(DisableKerning);
+        TEST(KerningAsian);
+        TEST(Vertical);
+        TEST(KashidaJustification);
+        TEST(ForFallback);
+#undef TEST
+        s << "}";
+    }
+
+    const int nLength = rArgs.mrStr.getLength();
+
+    s << ",Length=" << nLength;
+    s << ",MinCharPos=" << rArgs.mnMinCharPos;
+    s << ",EndCharPos=" << rArgs.mnEndCharPos;
+
+    s << ",Str=\"";
+    int lim = nLength;
+    if (lim > 10)
+        lim = 7;
+    for (int i = 0; i < lim; i++)
+    {
+        if (rArgs.mrStr[i] == '\n')
+            s << "\\n";
+        else if (rArgs.mrStr[i] < ' ' || (rArgs.mrStr[i] >= 0x7F && rArgs.mrStr[i] <= 0xFF))
+            s << "\\0x" << std::hex << std::setw(2) << std::setfill('0')
+              << static_cast<int>(rArgs.mrStr[i]) << std::setfill(' ') << std::setw(1) << std::dec;
+        else if (rArgs.mrStr[i] < 0x7F)
+            s << static_cast<char>(rArgs.mrStr[i]);
+        else
+            s << "\\u" << std::hex << std::setw(4) << std::setfill('0')
+              << static_cast<int>(rArgs.mrStr[i]) << std::setfill(' ') << std::setw(1) << std::dec;
+    }
+    if (nLength > lim)
+        s << "...";
+    s << "\"";
+
+    s << ",DXArray=";
+    if (rArgs.mpDXArray || rArgs.mpAltNaturalDXArray)
+    {
+        s << "[";
+        int count = rArgs.mnEndCharPos - rArgs.mnMinCharPos;
+        lim = count;
+        if (lim > 10)
+            lim = 7;
+        for (int i = 0; i < lim; i++)
+        {
+            if (rArgs.mpDXArray)
+                s << rArgs.mpDXArray[i];
+            else
+                s << rArgs.mpAltNaturalDXArray[i];
+            if (i < lim - 1)
+                s << ",";
+        }
+        if (count > lim)
+        {
+            if (count > lim + 1)
+                s << "...";
+            if (rArgs.mpDXArray)
+                s << rArgs.mpDXArray[count - 1];
+            else
+                s << rArgs.mpAltNaturalDXArray[count - 1];
+        }
+        s << "]";
+    }
+    else
+        s << "NULL";
+
+    s << ",LayoutWidth=" << rArgs.mnLayoutWidth;
+
+    s << "}";
+
+#endif
+    return s;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */