vcl/win/gdi/winlayout.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21 #include <config_features.h>
  22
  23 #include <memory>
  24
  25 #include <o3tl/safeint.hxx>
  26 #include <osl/module.h>
  27 #include <osl/file.h>
  28 #include <sal/log.hxx>
  29
  30 #include <comphelper/windowserrorstring.hxx>
  31 #include <comphelper/scopeguard.hxx>
  32
  33 #include <win/salgdi.h>
  34 #include <win/saldata.hxx>
  35 #include <win/wingdiimpl.hxx>
  36 #include <ImplOutDevData.hxx>
  37
  38 #include <win/DWriteTextRenderer.hxx>
  39 #include <win/scoped_gdi.hxx>
  40
  41 #include <sallayout.hxx>
  42
  43 #include <cstdio>
  44 #include <cstdlib>
  45
  46 #include <rtl/character.hxx>
  47
  48 #include <algorithm>
  49
  50 #include <shlwapi.h>
  51 #include <winver.h>
  52
  53 TextOutRenderer& TextOutRenderer::get(bool bUseDWrite, bool bRenderingModeNatural, bool bAntiAlias)
  54 {
  55     SalData* const pSalData = GetSalData();
  56
  57     if (!pSalData)
  58     { // don't call this after DeInitVCL()
  59         fprintf(stderr, "TextOutRenderer fatal error: no SalData");
  60         abort();
  61     }
  62
  63     if (bUseDWrite)
  64     {
  65         const auto mode = D2DWriteTextOutRenderer::GetMode(bRenderingModeNatural, bAntiAlias);
  66         if (pSalData->m_pD2DWriteTextOutRenderer)
  67         {
  68             auto pRenderer
  69                 = static_cast<D2DWriteTextOutRenderer*>(pSalData->m_pD2DWriteTextOutRenderer.get());
  70             if (pRenderer->GetRenderingMode() == mode)
  71                 return *pSalData->m_pD2DWriteTextOutRenderer;
  72         }
  73
  74         pSalData->m_pD2DWriteTextOutRenderer.reset(new D2DWriteTextOutRenderer(mode));
  75         return *pSalData->m_pD2DWriteTextOutRenderer;
  76     }
  77     if (!pSalData->m_pExTextOutRenderer)
  78     {
  79         pSalData->m_pExTextOutRenderer.reset(new ExTextOutRenderer);
  80     }
  81     return *pSalData->m_pExTextOutRenderer;
  82 }
  83
  84 bool ExTextOutRenderer::operator()(GenericSalLayout const& rLayout, SalGraphics& /*rGraphics*/,
  85                                    HDC hDC)
  86 {
  87     int nStart = 0;
  88     basegfx::B2DPoint aPos;
  89     const GlyphItem* pGlyph;
  90     const WinFontInstance* pWinFont = static_cast<const WinFontInstance*>(&rLayout.GetFont());
  91     UINT nTextAlign = GetTextAlign(hDC);
  92     UINT nCurTextAlign = nTextAlign;
  93     sal_Int32 nGlyphOffset = -pWinFont->GetTmDescent();
  94
  95     while (rLayout.GetNextGlyph(&pGlyph, aPos, nStart))
  96     {
  97         wchar_t glyphWStr = pGlyph->glyphId();
  98         UINT32 nNewTextAlign = nCurTextAlign;
  99         sal_Int32 nYOffset = 0;
 100
 101         if (pWinFont->IsCJKVerticalFont() && pGlyph->IsVertical())
 102         {
 103             nNewTextAlign = VTA_CENTER | TA_BOTTOM;
 104             nYOffset = nGlyphOffset;
 105         }
 106         else
 107             nNewTextAlign = nTextAlign;
 108
 109         if (nCurTextAlign != nNewTextAlign)
 110             SetTextAlign(hDC, nNewTextAlign);
 111
 112         ExtTextOutW(hDC, aPos.getX(), aPos.getY() + nYOffset, ETO_GLYPH_INDEX, nullptr, &glyphWStr,
 113                     1, nullptr);
 114
 115         nCurTextAlign = nNewTextAlign;
 116     }
 117
 118     if (nCurTextAlign != nTextAlign)
 119         SetTextAlign(hDC, nTextAlign);
 120
 121     return true;
 122 }
 123
 124 std::unique_ptr<GenericSalLayout> WinSalGraphics::GetTextLayout(int nFallbackLevel)
 125 {
 126     assert(mpWinFontEntry[nFallbackLevel]);
 127     if (!mpWinFontEntry[nFallbackLevel])
 128         return nullptr;
 129
 130     assert(mpWinFontEntry[nFallbackLevel]->GetFontFace());
 131
 132     mpWinFontEntry[nFallbackLevel]->SetGraphics(this);
 133     return std::make_unique<GenericSalLayout>(*mpWinFontEntry[nFallbackLevel]);
 134 }
 135
 136 WinFontInstance::WinFontInstance(const WinFontFace& rPFF, const vcl::font::FontSelectPattern& rFSP)
 137     : LogicalFontInstance(rPFF, rFSP)
 138     , m_pGraphics(nullptr)
 139     , m_hFont(nullptr)
 140     , m_bIsCJKVerticalFont(false)
 141     , m_nTmDescent(0)
 142 {
 143 }
 144
 145 WinFontInstance::~WinFontInstance()
 146 {
 147     if (m_hFont)
 148         ::DeleteFont(m_hFont);
 149 }
 150
 151 float WinFontInstance::getHScale() const
 152 {
 153     const vcl::font::FontSelectPattern& rPattern = GetFontSelectPattern();
 154     if (!rPattern.mnHeight || !rPattern.mnWidth)
 155         return 1.0;
 156     return rPattern.mnWidth * GetAverageWidthFactor() / rPattern.mnHeight;
 157 }
 158
 159 void WinFontInstance::ImplInitHbFont(hb_font_t* /*pHbFont*/)
 160 {
 161     assert(m_pGraphics);
 162     // Calculate the AverageWidthFactor, see LogicalFontInstance::GetScale().
 163     if (GetFontSelectPattern().mnWidth)
 164     {
 165         double nUPEM = GetFontFace()->UnitsPerEm();
 166
 167         LOGFONTW aLogFont;
 168         GetObjectW(m_hFont, sizeof(LOGFONTW), &aLogFont);
 169
 170         // Set the height (font size) to EM to minimize rounding errors.
 171         aLogFont.lfHeight = -nUPEM;
 172         // Set width to the default to get the original value in the metrics.
 173         aLogFont.lfWidth = 0;
 174
 175         TEXTMETRICW aFontMetric;
 176         {
 177             // Get the font metrics.
 178             HDC hDC = m_pGraphics->getHDC();
 179             ScopedSelectedHFONT hFont(hDC, CreateFontIndirectW(&aLogFont));
 180             GetTextMetricsW(hDC, &aFontMetric);
 181         }
 182
 183         SetAverageWidthFactor(nUPEM / aFontMetric.tmAveCharWidth);
 184     }
 185 }
 186
 187 void WinFontInstance::SetGraphics(WinSalGraphics* pGraphics)
 188 {
 189     m_pGraphics = pGraphics;
 190     if (m_hFont)
 191         return;
 192     HFONT hOrigFont;
 193     HDC hDC = m_pGraphics->getHDC();
 194     std::tie(m_hFont, m_bIsCJKVerticalFont, m_nTmDescent)
 195         = m_pGraphics->ImplDoSetFont(hDC, GetFontSelectPattern(), GetFontFace(), hOrigFont);
 196     SelectObject(hDC, hOrigFont);
 197 }
 198
 199 void WinSalGraphics::DrawTextLayout(const GenericSalLayout& rLayout, HDC hDC, bool bUseDWrite,
 200                                     bool bRenderingModeNatural)
 201 {
 202     auto& render = TextOutRenderer::get(bUseDWrite, bRenderingModeNatural, getAntiAlias());
 203     render(rLayout, *this, hDC);
 204 }
 205
 206 void WinSalGraphics::DrawTextLayout(const GenericSalLayout& rLayout)
 207 {
 208     if (!mbPrinter && mWinSalGraphicsImplBase->DrawTextLayout(rLayout))
 209         return; // handled by mWinSalGraphicsImplBase
 210
 211     HDC hDC = getHDC();
 212     const WinFontInstance* pWinFont = static_cast<const WinFontInstance*>(&rLayout.GetFont());
 213     const HFONT hLayoutFont = pWinFont->GetHFONT();
 214
 215     const HFONT hOrigFont = ::SelectFont(hDC, hLayoutFont);
 216
 217     // DWrite text renderer performs vertical writing better except printing.
 218     const bool bVerticalScreenText
 219         = !mbPrinter && rLayout.GetFont().GetFontSelectPattern().mbVertical;
 220     const bool bRenderingModeNatural = rLayout.GetSubpixelPositioning();
 221     const bool bUseDWrite = bVerticalScreenText || bRenderingModeNatural;
 222     DrawTextLayout(rLayout, hDC, bUseDWrite, bRenderingModeNatural);
 223
 224     ::SelectFont(hDC, hOrigFont);
 225 }
 226
 227 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */