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