The Tor Browser: gfx/2d/ScaledFontCairo.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "ScaledFontCairo.h"

     7 #include "Logging.h"

     9 #ifdef MOZ_ENABLE_FREETYPE

    10 #include <ft2build.h>

    11 #include FT_FREETYPE_H

    12 #include "cairo-ft.h"

    13 #endif

    15 #if defined(USE_SKIA) && defined(MOZ_ENABLE_FREETYPE)

    16 #include "skia/SkTypeface.h"

    17 #include "skia/SkTypeface_cairo.h"

    18 #endif

    20 #include <string>

    22 typedef struct FT_FaceRec_* FT_Face;

    24 using namespace std;

    26 namespace mozilla {

    27 namespace gfx {

    29 // On Linux and Android our "platform" font is a cairo_scaled_font_t and we use

    30 // an SkFontHost implementation that allows Skia to render using this.

    31 // This is mainly because FT_Face is not good for sharing between libraries, which

    32 // is a requirement when we consider runtime switchable backends and so on

    33 ScaledFontCairo::ScaledFontCairo(cairo_scaled_font_t* aScaledFont, Float aSize)

    34   : ScaledFontBase(aSize)

    35 {

    36   SetCairoScaledFont(aScaledFont);

    37 }

    39 #if defined(USE_SKIA) && defined(MOZ_ENABLE_FREETYPE)

    40 SkTypeface* ScaledFontCairo::GetSkTypeface()

    41 {

    42   if (!mTypeface) {

    43     cairo_font_face_t* fontFace = cairo_scaled_font_get_font_face(mScaledFont);

    44     FT_Face face = cairo_ft_scaled_font_lock_face(mScaledFont);

    46     int style = SkTypeface::kNormal;

    48     if (face->style_flags & FT_STYLE_FLAG_ITALIC)

    49     style |= SkTypeface::kItalic;

    51     if (face->style_flags & FT_STYLE_FLAG_BOLD)

    52       style |= SkTypeface::kBold;

    54     bool isFixedWidth = face->face_flags & FT_FACE_FLAG_FIXED_WIDTH;

    55     cairo_ft_scaled_font_unlock_face(mScaledFont);

    57     mTypeface = SkCreateTypefaceFromCairoFont(fontFace, (SkTypeface::Style)style, isFixedWidth);

    58   }

    60   return mTypeface;

    61 }

    62 #endif

    64 }

    65 }

The Tor Browser / file revision

gfx/2d/ScaledFontCairo.cpp@97036ab72558

gfx/2d/ScaledFontCairo.cpp