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|
/* -*- 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 <gcach_ftyp.hxx>
#include <sallayout.hxx>
#include <salgdi.hxx>
#include <scrptrun.h>
#include <i18nlangtag/mslangid.hxx>
#include <vcl/svapp.hxx>
#include <vcl/unohelp.hxx>
#include <sal/alloca.h>
#include <rtl/instance.hxx>
#include <hb-icu.h>
#include <hb-ot.h>
#include <com/sun/star/i18n/CharacterIteratorMode.hpp>
// layout implementation for ServerFont
ServerFontLayout::ServerFontLayout( ServerFont& rFont )
: mrServerFont( rFont )
{
}
void ServerFontLayout::DrawText( SalGraphics& rSalGraphics ) const
{
rSalGraphics.DrawServerFontLayout( *this );
}
bool ServerFontLayout::LayoutText( ImplLayoutArgs& rArgs )
{
return mrServerFont.GetLayoutEngine()->Layout(*this, rArgs);
}
void ServerFontLayout::AdjustLayout( ImplLayoutArgs& rArgs )
{
GenericSalLayout::AdjustLayout( rArgs );
// apply asian kerning if the glyphs are not already formatted
if( (rArgs.mnFlags & SAL_LAYOUT_KERNING_ASIAN)
&& !(rArgs.mnFlags & SAL_LAYOUT_VERTICAL) )
if( (rArgs.mpDXArray != NULL) || (rArgs.mnLayoutWidth != 0) )
ApplyAsianKerning( rArgs.mpStr, rArgs.mnLength );
// insert kashidas where requested by the formatting array
if( (rArgs.mnFlags & SAL_LAYOUT_KASHIDA_JUSTIFICATON) && rArgs.mpDXArray )
{
int nKashidaIndex = mrServerFont.GetGlyphIndex( 0x0640 );
if( nKashidaIndex != 0 )
{
const GlyphMetric& rGM = mrServerFont.GetGlyphMetric( nKashidaIndex );
KashidaJustify( nKashidaIndex, rGM.GetCharWidth() );
// TODO: kashida-GSUB/GPOS
}
}
}
void ServerFontLayout::SetNeedFallback(ImplLayoutArgs& rArgs, sal_Int32 nCharPos,
bool bRightToLeft)
{
if (nCharPos < 0)
return;
using namespace ::com::sun::star;
if (!mxBreak.is())
mxBreak = vcl::unohelper::CreateBreakIterator();
lang::Locale aLocale(rArgs.maLanguageTag.getLocale());
//if position nCharPos is missing in the font, grab the entire grapheme and
//mark all glyphs as missing so the whole thing is rendered with the same
//font
OUString aRun(rArgs.mpStr);
sal_Int32 nDone;
sal_Int32 nGraphemeStartPos =
mxBreak->previousCharacters(aRun, nCharPos+1, aLocale,
i18n::CharacterIteratorMode::SKIPCELL, 1, nDone);
sal_Int32 nGraphemeEndPos =
mxBreak->nextCharacters(aRun, nCharPos, aLocale,
i18n::CharacterIteratorMode::SKIPCELL, 1, nDone);
rArgs.NeedFallback(nGraphemeStartPos, nGraphemeEndPos, bRightToLeft);
}
std::ostream &operator <<(std::ostream& s, ServerFont* pFont)
{
#ifndef SAL_LOG_INFO
(void) pFont;
#else
FT_Face aFace = pFont->GetFtFace();
const char* pName = FT_Get_Postscript_Name(aFace);
if (pName)
s << pName;
else
s << pFont->GetFontFileName();
#endif
return s;
}
static hb_blob_t *getFontTable(hb_face_t* /*face*/, hb_tag_t nTableTag, void* pUserData)
{
char pTagName[5];
pTagName[0] = (char)(nTableTag >> 24);
pTagName[1] = (char)(nTableTag >> 16);
pTagName[2] = (char)(nTableTag >> 8);
pTagName[3] = (char)(nTableTag);
pTagName[4] = 0;
ServerFont* pFont = static_cast<ServerFont*>(pUserData);
SAL_INFO("vcl.harfbuzz", "getFontTable(" << pFont << ", " << pTagName << ")");
sal_uLong nLength;
const unsigned char* pBuffer = pFont->GetTable(pTagName, &nLength);
hb_blob_t* pBlob = NULL;
if (pBuffer != NULL)
pBlob = hb_blob_create(reinterpret_cast<const char*>(pBuffer), nLength, HB_MEMORY_MODE_READONLY, (void*) pBuffer, NULL);
return pBlob;
}
static hb_bool_t getFontGlyph(hb_font_t* /*font*/, void* pFontData,
hb_codepoint_t ch, hb_codepoint_t vs,
hb_codepoint_t* nGlyphIndex,
void* /*pUserData*/)
{
ServerFont* pFont = static_cast<ServerFont*>(pFontData);
*nGlyphIndex = pFont->GetRawGlyphIndex(ch, vs);
return *nGlyphIndex != 0;
}
static hb_position_t getGlyphAdvanceH(hb_font_t* /*font*/, void* pFontData,
hb_codepoint_t nGlyphIndex,
void* /*pUserData*/)
{
ServerFont* pFont = static_cast<ServerFont*>(pFontData);
const GlyphMetric& rGM = pFont->GetGlyphMetric(nGlyphIndex);
return rGM.GetCharWidth() << 6;
}
static hb_position_t getGlyphAdvanceV(hb_font_t* /*font*/, void* /*pFontData*/,
hb_codepoint_t /*nGlyphIndex*/,
void* /*pUserData*/)
{
// XXX: vertical metrics
return 0;
}
static hb_bool_t getGlyphOriginH(hb_font_t* /*font*/, void* /*pFontData*/,
hb_codepoint_t /*nGlyphIndex*/,
hb_position_t* /*x*/, hb_position_t* /*y*/,
void* /*pUserData*/)
{
// the horizontal origin is always (0, 0)
return true;
}
static hb_bool_t getGlyphOriginV(hb_font_t* /*font*/, void* /*pFontData*/,
hb_codepoint_t /*nGlyphIndex*/,
hb_position_t* /*x*/, hb_position_t* /*y*/,
void* /*pUserData*/)
{
// XXX: vertical origin
return true;
}
static hb_position_t getGlyphKerningH(hb_font_t* /*font*/, void* pFontData,
hb_codepoint_t nGlyphIndex1, hb_codepoint_t nGlyphIndex2,
void* /*pUserData*/)
{
// This callback is for old style 'kern' table, GPOS kerning is handled by HarfBuzz directly
ServerFont* pFont = static_cast<ServerFont*>(pFontData);
FT_Face aFace = pFont->GetFtFace();
SAL_INFO("vcl.harfbuzz", "getGlyphKerningH(" << pFont << ", " << nGlyphIndex1 << ", " << nGlyphIndex2 << ")");
FT_Error error;
FT_Vector kerning;
hb_position_t ret;
error = FT_Get_Kerning(aFace, nGlyphIndex1, nGlyphIndex2, FT_KERNING_DEFAULT, &kerning);
if (error)
ret = 0;
else
ret = kerning.x;
return ret;
}
static hb_position_t getGlyphKerningV(hb_font_t* /*font*/, void* /*pFontData*/,
hb_codepoint_t /*nGlyphIndex1*/, hb_codepoint_t /*nGlyphIndex2*/,
void* /*pUserData*/)
{
// XXX vertical kerning
return 0;
}
static hb_bool_t getGlyphExtents(hb_font_t* /*font*/, void* pFontData,
hb_codepoint_t nGlyphIndex,
hb_glyph_extents_t* pExtents,
void* /*pUserData*/)
{
ServerFont* pFont = static_cast<ServerFont*>(pFontData);
FT_Face aFace = pFont->GetFtFace();
SAL_INFO("vcl.harfbuzz", "getGlyphExtents(" << pFont << ", " << nGlyphIndex << ")");
FT_Error error;
error = FT_Load_Glyph(aFace, nGlyphIndex, FT_LOAD_DEFAULT);
if (!error)
{
pExtents->x_bearing = aFace->glyph->metrics.horiBearingX;
pExtents->y_bearing = aFace->glyph->metrics.horiBearingY;
pExtents->width = aFace->glyph->metrics.width;
pExtents->height = -aFace->glyph->metrics.height;
}
return !error;
}
static hb_bool_t getGlyphContourPoint(hb_font_t* /*font*/, void* pFontData,
hb_codepoint_t nGlyphIndex, unsigned int nPointIndex,
hb_position_t *x, hb_position_t *y,
void* /*pUserData*/)
{
bool ret = false;
ServerFont* pFont = static_cast<ServerFont*>(pFontData);
FT_Face aFace = pFont->GetFtFace();
SAL_INFO("vcl.harfbuzz", "getGlyphContourPoint(" << pFont << ", " << nGlyphIndex << ", " << nPointIndex << ")");
FT_Error error;
error = FT_Load_Glyph(aFace, nGlyphIndex, FT_LOAD_DEFAULT);
if (!error)
{
if (aFace->glyph->format == FT_GLYPH_FORMAT_OUTLINE)
{
if (nPointIndex < (unsigned int) aFace->glyph->outline.n_points)
{
*x = aFace->glyph->outline.points[nPointIndex].x;
*y = aFace->glyph->outline.points[nPointIndex].y;
ret = true;
}
}
}
return ret;
}
static hb_font_funcs_t* getFontFuncs(void)
{
static hb_font_funcs_t* funcs = hb_font_funcs_create();
hb_font_funcs_set_glyph_func (funcs, getFontGlyph, NULL, NULL);
hb_font_funcs_set_glyph_h_advance_func (funcs, getGlyphAdvanceH, NULL, NULL);
hb_font_funcs_set_glyph_v_advance_func (funcs, getGlyphAdvanceV, NULL, NULL);
hb_font_funcs_set_glyph_h_origin_func (funcs, getGlyphOriginH, NULL, NULL);
hb_font_funcs_set_glyph_v_origin_func (funcs, getGlyphOriginV, NULL, NULL);
hb_font_funcs_set_glyph_h_kerning_func (funcs, getGlyphKerningH, NULL, NULL);
hb_font_funcs_set_glyph_v_kerning_func (funcs, getGlyphKerningV, NULL, NULL);
hb_font_funcs_set_glyph_extents_func (funcs, getGlyphExtents, NULL, NULL);
hb_font_funcs_set_glyph_contour_point_func (funcs, getGlyphContourPoint, NULL, NULL);
return funcs;
}
// Disabled Unicode compatibility decomposition, see fdo#66715
static unsigned int unicodeDecomposeCompatibility(hb_unicode_funcs_t* /*ufuncs*/,
hb_codepoint_t /*u*/,
hb_codepoint_t* /*decomposed*/,
void* /*user_data*/)
{
return 0;
}
static hb_unicode_funcs_t* getUnicodeFuncs(void)
{
static hb_unicode_funcs_t* ufuncs = hb_unicode_funcs_create(hb_icu_get_unicode_funcs());
hb_unicode_funcs_set_decompose_compatibility_func(ufuncs, unicodeDecomposeCompatibility, NULL, NULL);
return ufuncs;
}
class HbLayoutEngine : public ServerFontLayoutEngine
{
private:
hb_script_t maHbScript;
hb_face_t* mpHbFace;
int mnUnitsPerEM;
public:
HbLayoutEngine(ServerFont&);
virtual ~HbLayoutEngine();
virtual bool Layout(ServerFontLayout&, ImplLayoutArgs&) SAL_OVERRIDE;
};
HbLayoutEngine::HbLayoutEngine(ServerFont& rServerFont)
: maHbScript(HB_SCRIPT_INVALID),
mpHbFace(NULL),
mnUnitsPerEM(0)
{
FT_Face aFtFace = rServerFont.GetFtFace();
mnUnitsPerEM = rServerFont.GetEmUnits();
mpHbFace = hb_face_create_for_tables(getFontTable, &rServerFont, NULL);
hb_face_set_index(mpHbFace, aFtFace->face_index);
hb_face_set_upem(mpHbFace, mnUnitsPerEM);
}
HbLayoutEngine::~HbLayoutEngine()
{
hb_face_destroy(mpHbFace);
}
struct HbScriptRun
{
int32_t mnMin;
int32_t mnEnd;
hb_script_t maScript;
HbScriptRun(int32_t nMin, int32_t nEnd, UScriptCode aScript)
: mnMin(nMin), mnEnd(nEnd),
maScript(hb_icu_script_to_script(aScript))
{}
};
typedef std::vector<HbScriptRun> HbScriptRuns;
namespace vcl {
struct Run
{
int32_t nStart;
int32_t nEnd;
UScriptCode nCode;
Run(int32_t nStart_, int32_t nEnd_, UScriptCode nCode_)
: nStart(nStart_), nEnd(nEnd_), nCode(nCode_)
{}
};
class TextLayoutCache
{
public:
std::vector<vcl::Run> runs;
TextLayoutCache(OUString const& rString, sal_Int32 const nEnd)
{
vcl::ScriptRun aScriptRun(
reinterpret_cast<const UChar *>(rString.getStr()),
nEnd);
while (aScriptRun.next())
{
runs.push_back(Run(aScriptRun.getScriptStart(),
aScriptRun.getScriptEnd(), aScriptRun.getScriptCode()));
}
}
};
}
std::shared_ptr<vcl::TextLayoutCache> ServerFontLayout::CreateTextLayoutCache(
OUString const& rString) const
{
return std::make_shared<vcl::TextLayoutCache>(rString, rString.getLength());
}
bool HbLayoutEngine::Layout(ServerFontLayout& rLayout, ImplLayoutArgs& rArgs)
{
ServerFont& rFont = rLayout.GetServerFont();
FT_Face aFtFace = rFont.GetFtFace();
SAL_INFO("vcl.harfbuzz", "layout(" << this << ",rArgs=" << rArgs << ")");
static hb_font_funcs_t* pHbFontFuncs = getFontFuncs();
hb_font_t *pHbFont = hb_font_create(mpHbFace);
hb_font_set_funcs(pHbFont, pHbFontFuncs, &rFont, NULL);
hb_font_set_scale(pHbFont,
((uint64_t) aFtFace->size->metrics.x_scale * (uint64_t) mnUnitsPerEM) >> 16,
((uint64_t) aFtFace->size->metrics.y_scale * (uint64_t) mnUnitsPerEM) >> 16);
hb_font_set_ppem(pHbFont, aFtFace->size->metrics.x_ppem, aFtFace->size->metrics.y_ppem);
// allocate temporary arrays, note: round to even
int nGlyphCapacity = (3 * (rArgs.mnEndCharPos - rArgs.mnMinCharPos) | 15) + 1;
rLayout.Reserve(nGlyphCapacity);
std::unique_ptr<vcl::TextLayoutCache> pNewScriptRun;
vcl::TextLayoutCache const* pTextLayout;
if (rArgs.m_pTextLayoutCache)
{
pTextLayout = rArgs.m_pTextLayoutCache; // use cache!
}
else
{
pNewScriptRun.reset(new vcl::TextLayoutCache(
reinterpret_cast<const UChar *>(rArgs.mpStr), rArgs.mnEndCharPos));
pTextLayout = pNewScriptRun.get();
}
Point aCurrPos(0, 0);
while (true)
{
int nBidiMinRunPos, nBidiEndRunPos;
bool bRightToLeft;
if (!rArgs.GetNextRun(&nBidiMinRunPos, &nBidiEndRunPos, &bRightToLeft))
break;
// Find script subruns.
int nCurrentPos = nBidiMinRunPos;
HbScriptRuns aScriptSubRuns;
size_t k = 0;
for (; k < pTextLayout->runs.size(); ++k)
{
vcl::Run const& rRun(pTextLayout->runs[k]);
if (rRun.nStart <= nCurrentPos && nCurrentPos < rRun.nEnd)
{
break;
}
}
while (nCurrentPos < nBidiEndRunPos && k < pTextLayout->runs.size())
{
int32_t nMinRunPos = nCurrentPos;
int32_t nEndRunPos = std::min(pTextLayout->runs[k].nEnd, nBidiEndRunPos);
HbScriptRun aRun(nMinRunPos, nEndRunPos, pTextLayout->runs[k].nCode);
aScriptSubRuns.push_back(aRun);
nCurrentPos = nEndRunPos;
++k;
}
// RTL subruns should be reversed to ensure that final glyph order is
// correct.
if (bRightToLeft)
std::reverse(aScriptSubRuns.begin(), aScriptSubRuns.end());
for (HbScriptRuns::iterator it = aScriptSubRuns.begin(); it != aScriptSubRuns.end(); ++it)
{
int nMinRunPos = it->mnMin;
int nEndRunPos = it->mnEnd;
int nRunLen = nEndRunPos - nMinRunPos;
maHbScript = it->maScript;
OString sLanguage = OUStringToOString(rArgs.maLanguageTag.getLanguage(), RTL_TEXTENCODING_UTF8);
static hb_unicode_funcs_t* pHbUnicodeFuncs = getUnicodeFuncs();
int nHbFlags = HB_BUFFER_FLAGS_DEFAULT;
if (nMinRunPos == 0)
nHbFlags |= HB_BUFFER_FLAG_BOT; /* Beginning-of-text */
if (nEndRunPos == rArgs.mnLength)
nHbFlags |= HB_BUFFER_FLAG_EOT; /* End-of-text */
hb_buffer_t *pHbBuffer = hb_buffer_create();
hb_buffer_set_unicode_funcs(pHbBuffer, pHbUnicodeFuncs);
hb_buffer_set_direction(pHbBuffer, bRightToLeft ? HB_DIRECTION_RTL: HB_DIRECTION_LTR);
hb_buffer_set_script(pHbBuffer, maHbScript);
hb_buffer_set_language(pHbBuffer, hb_language_from_string(sLanguage.getStr(), -1));
hb_buffer_set_flags(pHbBuffer, (hb_buffer_flags_t) nHbFlags);
hb_buffer_add_utf16(pHbBuffer, rArgs.mpStr, rArgs.mnLength, nMinRunPos, nRunLen);
hb_shape(pHbFont, pHbBuffer, NULL, 0);
int nRunGlyphCount = hb_buffer_get_length(pHbBuffer);
hb_glyph_info_t *pHbGlyphInfos = hb_buffer_get_glyph_infos(pHbBuffer, NULL);
hb_glyph_position_t *pHbPositions = hb_buffer_get_glyph_positions(pHbBuffer, NULL);
for (int i = 0; i < nRunGlyphCount; ++i) {
int32_t nGlyphIndex = pHbGlyphInfos[i].codepoint;
int32_t nCharPos = pHbGlyphInfos[i].cluster;
// if needed request glyph fallback by updating LayoutArgs
if (!nGlyphIndex)
{
rLayout.SetNeedFallback(rArgs, nCharPos, bRightToLeft);
if (SAL_LAYOUT_FOR_FALLBACK & rArgs.mnFlags)
continue;
}
// apply vertical flags and glyph substitution
// XXX: Use HB_DIRECTION_TTB above and apply whatever flags magic
// FixupGlyphIndex() is doing, minus the GSUB part.
if (nCharPos >= 0)
{
sal_UCS4 aChar = rArgs.mpStr[nCharPos];
nGlyphIndex = rFont.FixupGlyphIndex(nGlyphIndex, aChar);
}
bool bInCluster = false;
if (i > 0 && pHbGlyphInfos[i].cluster == pHbGlyphInfos[i - 1].cluster)
bInCluster = true;
long nGlyphFlags = 0;
if (bRightToLeft)
nGlyphFlags |= GlyphItem::IS_RTL_GLYPH;
if (bInCluster)
nGlyphFlags |= GlyphItem::IS_IN_CLUSTER;
// The whole IS_DIACRITIC concept is a stupid hack that was
// introduced ages ago to work around the utter brokenness of the
// way justification adjustments are applied (the DXArray fiasco).
// Since it is such a stupid hack, there is no sane way to directly
// map to concepts of the "outside" world, so we do some rather
// ugly hacks:
// * If the font has a GDEF table, we check for glyphs with mark
// glyph class which is sensible, except that some fonts
// (fdo#70968) assign mark class to spacing marks (which is wrong
// but usually harmless), so we try to sniff what HarfBuzz thinks
// about this glyph by checking if it gives it a zero advance
// width.
// * If the font has no GDEF table, we just check if the glyph has
// zero advance width, but this is stupid and can be wrong. A
// better way would to check the character's Unicode combining
// class, but unfortunately glyph gives combining marks the
// cluster value of its base character, so nCharPos will be
// pointing to the wrong character (but HarfBuzz might change
// this in the future).
bool bDiacritic = false;
if (hb_ot_layout_has_glyph_classes(mpHbFace))
{
// the font has GDEF table
bool bMark = hb_ot_layout_get_glyph_class(mpHbFace, nGlyphIndex) == HB_OT_LAYOUT_GLYPH_CLASS_MARK;
if (bMark && pHbPositions[i].x_advance == 0)
bDiacritic = true;
}
else
{
// the font lacks GDEF table
if (pHbPositions[i].x_advance == 0)
bDiacritic = true;
}
if (bDiacritic)
nGlyphFlags |= GlyphItem::IS_DIACRITIC;
int32_t nXOffset = pHbPositions[i].x_offset >> 6;
int32_t nYOffset = pHbPositions[i].y_offset >> 6;
int32_t nXAdvance = pHbPositions[i].x_advance >> 6;
int32_t nYAdvance = pHbPositions[i].y_advance >> 6;
Point aNewPos = Point(aCurrPos.X() + nXOffset, -(aCurrPos.Y() + nYOffset));
const GlyphItem aGI(nCharPos, nGlyphIndex, aNewPos, nGlyphFlags, nXAdvance, nXOffset, nYOffset);
rLayout.AppendGlyph(aGI);
aCurrPos.X() += nXAdvance;
aCurrPos.Y() += nYAdvance;
}
hb_buffer_destroy(pHbBuffer);
}
}
hb_font_destroy(pHbFont);
// sort glyphs in visual order
// and then in logical order (e.g. diacritics after cluster start)
// XXX: why?
rLayout.SortGlyphItems();
// determine need for kashida justification
if((rArgs.mpDXArray || rArgs.mnLayoutWidth)
&& ((maHbScript == HB_SCRIPT_ARABIC) || (maHbScript == HB_SCRIPT_SYRIAC)))
rArgs.mnFlags |= SAL_LAYOUT_KASHIDA_JUSTIFICATON;
return true;
}
ServerFontLayoutEngine* ServerFont::GetLayoutEngine()
{
// find best layout engine for font, platform, script and language
if (!mpLayoutEngine) {
mpLayoutEngine = new HbLayoutEngine(*this);
}
return mpLayoutEngine;
}
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