vcl/skia/x11/textrender.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
  22 #if defined __clang__
  23 #pragma clang diagnostic push
  24 #pragma clang diagnostic ignored "-Wunused-value"
  25 #endif
  26 #if defined __GNUC__ && !defined __clang__
  27 #pragma GCC diagnostic push
  28 #pragma GCC diagnostic ignored "-Wunused-value"
  29 #endif
  30
  31 #include <skia/x11/textrender.hxx>
  32
  33 #include <unx/fc_fontoptions.hxx>
  34 #include <unx/freetype_glyphcache.hxx>
  35 #include <vcl/svapp.hxx>
  36 #include <sallayout.hxx>
  37 #include <skia/gdiimpl.hxx>
  38
  39 #include <SkFont.h>
  40 #include <SkFontMgr_fontconfig.h>
  41 #include <SkFontTypes.h>
  42
  43 #if defined __GNUC__ && !defined __clang__
  44 #pragma GCC diagnostic pop
  45 #endif
  46 #if defined __clang__
  47 #pragma clang diagnostic pop
  48 #endif
  49
  50 void SkiaTextRender::DrawTextLayout(const GenericSalLayout& rLayout, const SalGraphics& rGraphics)
  51 {
  52     const FreetypeFontInstance& rInstance = static_cast<FreetypeFontInstance&>(rLayout.GetFont());
  53     const FreetypeFont& rFont = rInstance.GetFreetypeFont();
  54     const vcl::font::FontSelectPattern& rFSD = rInstance.GetFontSelectPattern();
  55     if (rFSD.mnHeight == 0)
  56         return;
  57     double nHeight = rFSD.mnHeight;
  58     double nWidth = rFSD.mnWidth ? rFSD.mnWidth : nHeight;
  59
  60     if (!fontManager)
  61     {
  62         // Get the global FcConfig that our VCL fontconfig code uses, and refcount it.
  63         fontManager = SkFontMgr_New_FontConfig(FcConfigReference(nullptr));
  64     }
  65     sk_sp<SkTypeface> typeface
  66         = SkFontMgr_createTypefaceFromFcPattern(fontManager, rFont.GetFontOptions()->GetPattern());
  67     SkFont font(typeface);
  68     font.setSize(nHeight);
  69     font.setScaleX(nWidth / nHeight);
  70     if (rInstance.NeedsArtificialItalic())
  71         font.setSkewX(-1.0 * ARTIFICIAL_ITALIC_SKEW);
  72     if (rInstance.NeedsArtificialBold())
  73         font.setEmbolden(true);
  74
  75     bool bSubpixelPositioning = rLayout.GetSubpixelPositioning();
  76     SkFont::Edging ePreferredAliasing
  77         = bSubpixelPositioning ? SkFont::Edging::kSubpixelAntiAlias : SkFont::Edging::kAntiAlias;
  78     if (bSubpixelPositioning)
  79     {
  80         // note that SkFont defaults to a BaselineSnap of true, so I think really only
  81         // subpixel in text direction
  82         font.setSubpixel(true);
  83
  84         SkFontHinting eHinting = font.getHinting();
  85         static bool bAllowDefaultHinting = getenv("SAL_ALLOW_DEFAULT_HINTING") != nullptr;
  86         bool bAllowedHintStyle
  87             = bAllowDefaultHinting
  88               || (eHinting == SkFontHinting::kNone || eHinting == SkFontHinting::kSlight);
  89         if (!bAllowedHintStyle)
  90             font.setHinting(SkFontHinting::kSlight);
  91     }
  92
  93     font.setEdging(rFont.GetAntialiasAdvice() ? ePreferredAliasing : SkFont::Edging::kAlias);
  94
  95     // Vertical font, use width as "height".
  96     SkFont verticalFont(font);
  97     verticalFont.setSize(nWidth);
  98     verticalFont.setScaleX(nHeight / nWidth);
  99
 100     assert(dynamic_cast<SkiaSalGraphicsImpl*>(rGraphics.GetImpl()));
 101     SkiaSalGraphicsImpl* impl = static_cast<SkiaSalGraphicsImpl*>(rGraphics.GetImpl());
 102     impl->drawGenericLayout(rLayout, mnTextColor, font, verticalFont);
 103 }
 104
 105 void SkiaTextRender::ClearDevFontCache() { fontManager.reset(); }
 106
 107 #if 0
 108 // SKIA TODO
 109 void FontConfigFontOptions::cairo_font_options_substitute(FcPattern* pPattern)
 110 {
 111     ImplSVData* pSVData = ImplGetSVData();
 112     const cairo_font_options_t* pFontOptions = pSVData->mpDefInst->GetCairoFontOptions();
 113     if( !pFontOptions )
 114         return;
 115     cairo_ft_font_options_substitute(pFontOptions, pPattern);
 116 }
 117 #endif
 118
 119 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */