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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/.
*
* 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 <sal/config.h>
#include <sal/log.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#ifdef MACOSX
#include <osx/saldata.hxx>
#include <osx/salinst.h>
#endif
#include <font/LogicalFontInstance.hxx>
#include <impglyphitem.hxx>
#include <quartz/CoreTextFont.hxx>
#include <quartz/CoreTextFontFace.hxx>
#include <quartz/salgdi.h>
#include <quartz/utils.h>
#include <hb.h>
CoreTextFont::CoreTextFont(const CoreTextFontFace& rPFF, const vcl::font::FontSelectPattern& rFSP)
: LogicalFontInstance(rPFF, rFSP)
, mfFontStretch(1.0)
, mfFontRotation(0.0)
, mpCTFont(nullptr)
{
double fScaledFontHeight = rFSP.mfExactHeight;
// convert font rotation to radian
mfFontRotation = toRadians(rFSP.mnOrientation);
// dummy matrix so we can use CGAffineTransformConcat() below
CGAffineTransform aMatrix = CGAffineTransformMakeTranslation(0, 0);
// handle font stretching if any
if ((rFSP.mnWidth != 0) && (rFSP.mnWidth != rFSP.mnHeight))
{
mfFontStretch = float(rFSP.mnWidth) / rFSP.mnHeight;
aMatrix = CGAffineTransformConcat(aMatrix, CGAffineTransformMakeScale(mfFontStretch, 1.0F));
}
// artificial italic
if (NeedsArtificialItalic())
aMatrix = CGAffineTransformConcat(
aMatrix, CGAffineTransformMake(1, 0, ARTIFICIAL_ITALIC_SKEW, 1, 0, 0));
CTFontDescriptorRef pFontDesc = rPFF.GetFontDescriptorRef();
mpCTFont = CTFontCreateWithFontDescriptor(pFontDesc, fScaledFontHeight, &aMatrix);
}
CoreTextFont::~CoreTextFont()
{
if (mpCTFont)
CFRelease(mpCTFont);
}
void CoreTextFont::GetFontMetric(FontMetricDataRef const& rxFontMetric)
{
rxFontMetric->ImplCalcLineSpacing(this);
rxFontMetric->ImplInitBaselines(this);
// since FontMetricData::mnWidth is only used for stretching/squeezing fonts
// setting this width to the pixel height of the fontsize is good enough
// it also makes the calculation of the stretch factor simple
rxFontMetric->SetWidth(lrint(CTFontGetSize(mpCTFont) * mfFontStretch));
rxFontMetric->SetMinKashida(GetKashidaWidth());
}
namespace
{
// callbacks from CTFontCreatePathForGlyph+CGPathApply for GetGlyphOutline()
struct GgoData
{
basegfx::B2DPolygon maPolygon;
basegfx::B2DPolyPolygon* mpPolyPoly;
};
}
static void MyCGPathApplierFunc(void* pData, const CGPathElement* pElement)
{
basegfx::B2DPolygon& rPolygon = static_cast<GgoData*>(pData)->maPolygon;
const int nPointCount = rPolygon.count();
switch (pElement->type)
{
case kCGPathElementCloseSubpath:
case kCGPathElementMoveToPoint:
if (nPointCount > 0)
{
static_cast<GgoData*>(pData)->mpPolyPoly->append(rPolygon);
rPolygon.clear();
}
// fall through for kCGPathElementMoveToPoint:
if (pElement->type != kCGPathElementMoveToPoint)
{
break;
}
[[fallthrough]];
case kCGPathElementAddLineToPoint:
rPolygon.append(basegfx::B2DPoint(+pElement->points[0].x, -pElement->points[0].y));
break;
case kCGPathElementAddCurveToPoint:
rPolygon.append(basegfx::B2DPoint(+pElement->points[2].x, -pElement->points[2].y));
rPolygon.setNextControlPoint(
nPointCount - 1, basegfx::B2DPoint(pElement->points[0].x, -pElement->points[0].y));
rPolygon.setPrevControlPoint(
nPointCount + 0, basegfx::B2DPoint(pElement->points[1].x, -pElement->points[1].y));
break;
case kCGPathElementAddQuadCurveToPoint:
{
const basegfx::B2DPoint aStartPt = rPolygon.getB2DPoint(nPointCount - 1);
const basegfx::B2DPoint aCtrPt1((aStartPt.getX() + 2 * pElement->points[0].x) / 3.0,
(aStartPt.getY() - 2 * pElement->points[0].y) / 3.0);
const basegfx::B2DPoint aCtrPt2(
(+2 * pElement->points[0].x + pElement->points[1].x) / 3.0,
(-2 * pElement->points[0].y - pElement->points[1].y) / 3.0);
rPolygon.append(basegfx::B2DPoint(+pElement->points[1].x, -pElement->points[1].y));
rPolygon.setNextControlPoint(nPointCount - 1, aCtrPt1);
rPolygon.setPrevControlPoint(nPointCount + 0, aCtrPt2);
}
break;
}
}
bool CoreTextFont::GetGlyphOutline(sal_GlyphId nId, basegfx::B2DPolyPolygon& rResult, bool) const
{
rResult.clear();
CGGlyph nCGGlyph = nId;
SAL_WNODEPRECATED_DECLARATIONS_PUSH
const CTFontOrientation aFontOrientation = kCTFontDefaultOrientation;
SAL_WNODEPRECATED_DECLARATIONS_POP
CGRect aCGRect
= CTFontGetBoundingRectsForGlyphs(mpCTFont, aFontOrientation, &nCGGlyph, nullptr, 1);
if (!CGRectIsNull(aCGRect) && CGRectIsEmpty(aCGRect))
{
// CTFontCreatePathForGlyph returns NULL for blank glyphs, but we want
// to return true for them.
return true;
}
CGPathRef xPath = CTFontCreatePathForGlyph(mpCTFont, nCGGlyph, nullptr);
if (!xPath)
{
return false;
}
GgoData aGgoData;
aGgoData.mpPolyPoly = &rResult;
CGPathApply(xPath, static_cast<void*>(&aGgoData), MyCGPathApplierFunc);
#if 0 // TODO: does OSX ensure that the last polygon is always closed?
const CGPathElement aClosingElement = { kCGPathElementCloseSubpath, NULL };
MyCGPathApplierFunc( (void*)&aGgoData, &aClosingElement );
#endif
CFRelease(xPath);
return true;
}
hb_blob_t* CoreTextFontFace::GetHbTable(hb_tag_t nTag) const
{
hb_blob_t* pBlob = nullptr;
CTFontRef pFont = CTFontCreateWithFontDescriptor(mxFontDescriptor, 0.0, nullptr);
if (!nTag)
{
// If nTag is 0, the whole font data is requested. CoreText does not
// give us that, so we will construct an HarfBuzz face from CoreText
// table data and return the blob of that face.
auto pTags = CTFontCopyAvailableTables(pFont, kCTFontTableOptionNoOptions);
CFIndex nTags = pTags ? CFArrayGetCount(pTags) : 0;
if (nTags > 0)
{
hb_face_t* pHbFace = hb_face_builder_create();
for (CFIndex i = 0; i < nTags; i++)
{
auto nTable = reinterpret_cast<intptr_t>(CFArrayGetValueAtIndex(pTags, i));
assert(nTable);
auto pTable = GetHbTable(nTable);
assert(pTable);
hb_face_builder_add_table(pHbFace, nTable, pTable);
}
pBlob = hb_face_reference_blob(pHbFace);
hb_face_destroy(pHbFace);
}
if (pTags)
CFRelease(pTags);
}
else
{
CFDataRef pData = CTFontCopyTable(pFont, nTag, kCTFontTableOptionNoOptions);
const CFIndex nLength = pData ? CFDataGetLength(pData) : 0;
if (nLength > 0)
{
auto pBuffer = new UInt8[nLength];
const CFRange aRange = CFRangeMake(0, nLength);
CFDataGetBytes(pData, aRange, pBuffer);
pBlob = hb_blob_create(reinterpret_cast<const char*>(pBuffer), nLength,
HB_MEMORY_MODE_READONLY, pBuffer,
[](void* data) { delete[] static_cast<UInt8*>(data); });
}
if (pData)
CFRelease(pData);
}
CFRelease(pFont);
return pBlob;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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