Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 550 insertions, 0 deletions

diff --git a/gfx/2d/ScaledFontFontconfig.cpp b/gfx/2d/ScaledFontFontconfig.cpp
new file mode 100644
index 0000000000..e3025c1072
--- /dev/null
+++ b/gfx/2d/ScaledFontFontconfig.cpp
@@ -0,0 +1,550 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "ScaledFontFontconfig.h"
+#include "UnscaledFontFreeType.h"
+#include "Logging.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/webrender/WebRenderTypes.h"
+
+#include "skia/include/ports/SkTypeface_cairo.h"
+#include "HelpersSkia.h"
+
+#include <fontconfig/fcfreetype.h>
+
+#include FT_LCD_FILTER_H
+#include FT_MULTIPLE_MASTERS_H
+
+namespace mozilla::gfx {
+
+ScaledFontFontconfig::ScaledFontFontconfig(
+    RefPtr<SharedFTFace>&& aFace, FcPattern* aPattern,
+    const RefPtr<UnscaledFont>& aUnscaledFont, Float aSize)
+    : ScaledFontBase(aUnscaledFont, aSize),
+      mFace(std::move(aFace)),
+      mInstanceData(aPattern) {}
+
+ScaledFontFontconfig::ScaledFontFontconfig(
+    RefPtr<SharedFTFace>&& aFace, const InstanceData& aInstanceData,
+    const RefPtr<UnscaledFont>& aUnscaledFont, Float aSize)
+    : ScaledFontBase(aUnscaledFont, aSize),
+      mFace(std::move(aFace)),
+      mInstanceData(aInstanceData) {}
+
+bool ScaledFontFontconfig::UseSubpixelPosition() const {
+  return !MOZ_UNLIKELY(
+             StaticPrefs::
+                 gfx_text_subpixel_position_force_disabled_AtStartup()) &&
+         mInstanceData.mAntialias != AntialiasMode::NONE &&
+         FT_IS_SCALABLE(mFace->GetFace()) &&
+         (mInstanceData.mHinting == FontHinting::NONE ||
+          mInstanceData.mHinting == FontHinting::LIGHT ||
+          MOZ_UNLIKELY(
+              StaticPrefs::
+                  gfx_text_subpixel_position_force_enabled_AtStartup()));
+}
+
+SkTypeface* ScaledFontFontconfig::CreateSkTypeface() {
+  SkPixelGeometry geo = mInstanceData.mFlags & InstanceData::SUBPIXEL_BGR
+                            ? (mInstanceData.mFlags & InstanceData::LCD_VERTICAL
+                                   ? kBGR_V_SkPixelGeometry
+                                   : kBGR_H_SkPixelGeometry)
+                            : (mInstanceData.mFlags & InstanceData::LCD_VERTICAL
+                                   ? kRGB_V_SkPixelGeometry
+                                   : kRGB_H_SkPixelGeometry);
+  return SkCreateTypefaceFromCairoFTFont(mFace->GetFace(), mFace.get(), geo,
+                                         mInstanceData.mLcdFilter);
+}
+
+void ScaledFontFontconfig::SetupSkFontDrawOptions(SkFont& aFont) {
+  aFont.setSubpixel(UseSubpixelPosition());
+
+  if (mInstanceData.mFlags & InstanceData::AUTOHINT) {
+    aFont.setForceAutoHinting(true);
+  }
+  if (mInstanceData.mFlags & InstanceData::EMBEDDED_BITMAP) {
+    aFont.setEmbeddedBitmaps(true);
+  }
+  if (mInstanceData.mFlags & InstanceData::EMBOLDEN) {
+    aFont.setEmbolden(true);
+  }
+
+  aFont.setHinting(GfxHintingToSkiaHinting(mInstanceData.mHinting));
+}
+
+bool ScaledFontFontconfig::MayUseBitmaps() {
+  return mInstanceData.mFlags & InstanceData::EMBEDDED_BITMAP &&
+         !FT_IS_SCALABLE(mFace->GetFace());
+}
+
+cairo_font_face_t* ScaledFontFontconfig::CreateCairoFontFace(
+    cairo_font_options_t* aFontOptions) {
+  int loadFlags;
+  unsigned int synthFlags;
+  mInstanceData.SetupFontOptions(aFontOptions, &loadFlags, &synthFlags);
+
+  return cairo_ft_font_face_create_for_ft_face(mFace->GetFace(), loadFlags,
+                                               synthFlags, mFace.get());
+}
+
+AntialiasMode ScaledFontFontconfig::GetDefaultAAMode() {
+  return mInstanceData.mAntialias;
+}
+
+bool FcPatternAllowsBitmaps(FcPattern* aPattern, bool aAntialias,
+                            bool aHinting) {
+  if (!aAntialias) {
+    // Always allow bitmaps when antialiasing is disabled
+    return true;
+  }
+  FcBool bitmap;
+  if (FcPatternGetBool(aPattern, FC_EMBEDDED_BITMAP, 0, &bitmap) !=
+          FcResultMatch ||
+      !bitmap) {
+    // If bitmaps were explicitly disabled, then disallow them
+    return false;
+  }
+  if (aHinting) {
+    // If hinting is used and bitmaps were enabled, then allow them
+    return true;
+  }
+  // When hinting is disabled, then avoid loading bitmaps from outline
+  // fonts. However, emoji fonts may have no outlines while containing
+  // bitmaps intended to be scaled, so still allow those.
+  FcBool outline;
+  if (FcPatternGetBool(aPattern, FC_OUTLINE, 0, &outline) == FcResultMatch &&
+      outline) {
+    return false;
+  }
+  FcBool scalable;
+  if (FcPatternGetBool(aPattern, FC_SCALABLE, 0, &scalable) != FcResultMatch ||
+      !scalable) {
+    return false;
+  }
+  return true;
+}
+
+ScaledFontFontconfig::InstanceData::InstanceData(FcPattern* aPattern)
+    : mFlags(0),
+      mAntialias(AntialiasMode::NONE),
+      mHinting(FontHinting::NONE),
+      mLcdFilter(FT_LCD_FILTER_LEGACY) {
+  // Record relevant Fontconfig properties into instance data.
+  FcBool autohint;
+  if (FcPatternGetBool(aPattern, FC_AUTOHINT, 0, &autohint) == FcResultMatch &&
+      autohint) {
+    mFlags |= AUTOHINT;
+  }
+  FcBool embolden;
+  if (FcPatternGetBool(aPattern, FC_EMBOLDEN, 0, &embolden) == FcResultMatch &&
+      embolden) {
+    mFlags |= EMBOLDEN;
+  }
+
+  // For printer fonts, Cairo hint metrics and hinting will be disabled.
+  // For other fonts, allow hint metrics and hinting.
+  FcBool printing;
+  if (FcPatternGetBool(aPattern, "gfx.printing", 0, &printing) !=
+          FcResultMatch ||
+      !printing) {
+    mFlags |= HINT_METRICS;
+
+    FcBool hinting;
+    if (FcPatternGetBool(aPattern, FC_HINTING, 0, &hinting) != FcResultMatch ||
+        hinting) {
+      int hintstyle;
+      if (FcPatternGetInteger(aPattern, FC_HINT_STYLE, 0, &hintstyle) !=
+          FcResultMatch) {
+        hintstyle = FC_HINT_FULL;
+      }
+      switch (hintstyle) {
+        case FC_HINT_SLIGHT:
+          mHinting = FontHinting::LIGHT;
+          break;
+        case FC_HINT_MEDIUM:
+          mHinting = FontHinting::NORMAL;
+          break;
+        case FC_HINT_FULL:
+          mHinting = FontHinting::FULL;
+          break;
+        case FC_HINT_NONE:
+        default:
+          break;
+      }
+    }
+  }
+
+  FcBool antialias;
+  if (FcPatternGetBool(aPattern, FC_ANTIALIAS, 0, &antialias) ==
+          FcResultMatch &&
+      !antialias) {
+    // If AA is explicitly disabled, leave bitmaps enabled.
+    mFlags |= EMBEDDED_BITMAP;
+  } else {
+    mAntialias = AntialiasMode::GRAY;
+
+    // Otherwise, if AA is enabled, disable embedded bitmaps unless explicitly
+    // enabled.
+    if (FcPatternAllowsBitmaps(aPattern, true, mHinting != FontHinting::NONE)) {
+      mFlags |= EMBEDDED_BITMAP;
+    }
+
+    // Only record subpixel order and lcd filtering if antialiasing is enabled.
+    int rgba;
+    if (mFlags & HINT_METRICS &&
+        FcPatternGetInteger(aPattern, FC_RGBA, 0, &rgba) == FcResultMatch) {
+      switch (rgba) {
+        case FC_RGBA_RGB:
+        case FC_RGBA_BGR:
+        case FC_RGBA_VRGB:
+        case FC_RGBA_VBGR:
+          mAntialias = AntialiasMode::SUBPIXEL;
+          if (rgba == FC_RGBA_VRGB || rgba == FC_RGBA_VBGR) {
+            mFlags |= LCD_VERTICAL;
+          }
+          if (rgba == FC_RGBA_BGR || rgba == FC_RGBA_VBGR) {
+            mFlags |= SUBPIXEL_BGR;
+          }
+          break;
+        case FC_RGBA_NONE:
+        case FC_RGBA_UNKNOWN:
+        default:
+          break;
+      }
+    }
+
+    int filter;
+    if (mAntialias == AntialiasMode::SUBPIXEL &&
+        FcPatternGetInteger(aPattern, FC_LCD_FILTER, 0, &filter) ==
+            FcResultMatch) {
+      switch (filter) {
+        case FC_LCD_NONE:
+          mLcdFilter = FT_LCD_FILTER_NONE;
+          break;
+        case FC_LCD_DEFAULT:
+          mLcdFilter = FT_LCD_FILTER_DEFAULT;
+          break;
+        case FC_LCD_LIGHT:
+          mLcdFilter = FT_LCD_FILTER_LIGHT;
+          break;
+        case FC_LCD_LEGACY:
+        default:
+          break;
+      }
+    }
+  }
+}
+
+ScaledFontFontconfig::InstanceData::InstanceData(
+    const wr::FontInstanceOptions* aOptions,
+    const wr::FontInstancePlatformOptions* aPlatformOptions)
+    : mFlags(HINT_METRICS),
+      mAntialias(AntialiasMode::NONE),
+      mHinting(FontHinting::FULL),
+      mLcdFilter(FT_LCD_FILTER_LEGACY) {
+  if (aOptions) {
+    if (aOptions->flags & wr::FontInstanceFlags::FORCE_AUTOHINT) {
+      mFlags |= AUTOHINT;
+    }
+    if (aOptions->flags & wr::FontInstanceFlags::EMBEDDED_BITMAPS) {
+      mFlags |= EMBEDDED_BITMAP;
+    }
+    if (aOptions->flags & wr::FontInstanceFlags::SYNTHETIC_BOLD) {
+      mFlags |= EMBOLDEN;
+    }
+    if (aOptions->render_mode == wr::FontRenderMode::Subpixel) {
+      mAntialias = AntialiasMode::SUBPIXEL;
+      if (aOptions->flags & wr::FontInstanceFlags::SUBPIXEL_BGR) {
+        mFlags |= SUBPIXEL_BGR;
+      }
+      if (aOptions->flags & wr::FontInstanceFlags::LCD_VERTICAL) {
+        mFlags |= LCD_VERTICAL;
+      }
+    } else if (aOptions->render_mode != wr::FontRenderMode::Mono) {
+      mAntialias = AntialiasMode::GRAY;
+    }
+  }
+  if (aPlatformOptions) {
+    switch (aPlatformOptions->hinting) {
+      case wr::FontHinting::None:
+        mHinting = FontHinting::NONE;
+        break;
+      case wr::FontHinting::Light:
+        mHinting = FontHinting::LIGHT;
+        break;
+      case wr::FontHinting::Normal:
+        mHinting = FontHinting::NORMAL;
+        break;
+      default:
+        break;
+    }
+    switch (aPlatformOptions->lcd_filter) {
+      case wr::FontLCDFilter::None:
+        mLcdFilter = FT_LCD_FILTER_NONE;
+        break;
+      case wr::FontLCDFilter::Default:
+        mLcdFilter = FT_LCD_FILTER_DEFAULT;
+        break;
+      case wr::FontLCDFilter::Light:
+        mLcdFilter = FT_LCD_FILTER_LIGHT;
+        break;
+      default:
+        break;
+    }
+  }
+}
+
+void ScaledFontFontconfig::InstanceData::SetupFontOptions(
+    cairo_font_options_t* aFontOptions, int* aOutLoadFlags,
+    unsigned int* aOutSynthFlags) const {
+  // For regular (non-printer) fonts, enable hint metrics as well as hinting
+  // and (possibly subpixel) antialiasing.
+  cairo_font_options_set_hint_metrics(
+      aFontOptions,
+      mFlags & HINT_METRICS ? CAIRO_HINT_METRICS_ON : CAIRO_HINT_METRICS_OFF);
+
+  cairo_hint_style_t hinting;
+  switch (mHinting) {
+    case FontHinting::NONE:
+      hinting = CAIRO_HINT_STYLE_NONE;
+      break;
+    case FontHinting::LIGHT:
+      hinting = CAIRO_HINT_STYLE_SLIGHT;
+      break;
+    case FontHinting::NORMAL:
+      hinting = CAIRO_HINT_STYLE_MEDIUM;
+      break;
+    case FontHinting::FULL:
+      hinting = CAIRO_HINT_STYLE_FULL;
+      break;
+  }
+  cairo_font_options_set_hint_style(aFontOptions, hinting);
+
+  switch (mAntialias) {
+    case AntialiasMode::NONE:
+      cairo_font_options_set_antialias(aFontOptions, CAIRO_ANTIALIAS_NONE);
+      break;
+    case AntialiasMode::GRAY:
+    default:
+      cairo_font_options_set_antialias(aFontOptions, CAIRO_ANTIALIAS_GRAY);
+      break;
+    case AntialiasMode::SUBPIXEL: {
+      cairo_font_options_set_antialias(aFontOptions, CAIRO_ANTIALIAS_SUBPIXEL);
+      cairo_font_options_set_subpixel_order(
+          aFontOptions,
+          mFlags & SUBPIXEL_BGR
+              ? (mFlags & LCD_VERTICAL ? CAIRO_SUBPIXEL_ORDER_VBGR
+                                       : CAIRO_SUBPIXEL_ORDER_BGR)
+              : (mFlags & LCD_VERTICAL ? CAIRO_SUBPIXEL_ORDER_VRGB
+                                       : CAIRO_SUBPIXEL_ORDER_RGB));
+      cairo_lcd_filter_t lcdFilter = CAIRO_LCD_FILTER_DEFAULT;
+      switch (mLcdFilter) {
+        case FT_LCD_FILTER_NONE:
+          lcdFilter = CAIRO_LCD_FILTER_NONE;
+          break;
+        case FT_LCD_FILTER_DEFAULT:
+          lcdFilter = CAIRO_LCD_FILTER_FIR5;
+          break;
+        case FT_LCD_FILTER_LIGHT:
+          lcdFilter = CAIRO_LCD_FILTER_FIR3;
+          break;
+        case FT_LCD_FILTER_LEGACY:
+          lcdFilter = CAIRO_LCD_FILTER_INTRA_PIXEL;
+          break;
+      }
+      cairo_font_options_set_lcd_filter(aFontOptions, lcdFilter);
+      break;
+    }
+  }
+
+  // Try to build a sane initial set of Cairo font options based on the
+  // Fontconfig pattern.
+  int loadFlags = FT_LOAD_DEFAULT;
+  unsigned int synthFlags = 0;
+
+  if (!(mFlags & EMBEDDED_BITMAP)) {
+    loadFlags |= FT_LOAD_NO_BITMAP;
+  }
+  if (mFlags & AUTOHINT) {
+    loadFlags |= FT_LOAD_FORCE_AUTOHINT;
+  }
+  if (mFlags & EMBOLDEN) {
+    synthFlags |= CAIRO_FT_SYNTHESIZE_BOLD;
+  }
+
+  *aOutLoadFlags = loadFlags;
+  *aOutSynthFlags = synthFlags;
+}
+
+bool ScaledFontFontconfig::GetFontInstanceData(FontInstanceDataOutput aCb,
+                                               void* aBaton) {
+  std::vector<FontVariation> variations;
+  if (HasVariationSettings()) {
+    UnscaledFontFreeType::GetVariationSettingsFromFace(&variations,
+                                                       mFace->GetFace());
+  }
+
+  aCb(reinterpret_cast<uint8_t*>(&mInstanceData), sizeof(mInstanceData),
+      variations.data(), variations.size(), aBaton);
+  return true;
+}
+
+bool ScaledFontFontconfig::GetWRFontInstanceOptions(
+    Maybe<wr::FontInstanceOptions>* aOutOptions,
+    Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
+    std::vector<FontVariation>* aOutVariations) {
+  wr::FontInstanceOptions options;
+  options.render_mode = wr::FontRenderMode::Alpha;
+  options.flags = wr::FontInstanceFlags{0};
+  if (UseSubpixelPosition()) {
+    options.flags |= wr::FontInstanceFlags::SUBPIXEL_POSITION;
+  }
+  options.bg_color = wr::ToColorU(DeviceColor());
+  options.synthetic_italics =
+      wr::DegreesToSyntheticItalics(GetSyntheticObliqueAngle());
+
+  wr::FontInstancePlatformOptions platformOptions;
+  platformOptions.lcd_filter = wr::FontLCDFilter::Legacy;
+  platformOptions.hinting = wr::FontHinting::Normal;
+
+  if (mInstanceData.mFlags & InstanceData::AUTOHINT) {
+    options.flags |= wr::FontInstanceFlags::FORCE_AUTOHINT;
+  }
+  if (mInstanceData.mFlags & InstanceData::EMBOLDEN) {
+    options.flags |= wr::FontInstanceFlags::SYNTHETIC_BOLD;
+  }
+  if (mInstanceData.mFlags & InstanceData::EMBEDDED_BITMAP) {
+    options.flags |= wr::FontInstanceFlags::EMBEDDED_BITMAPS;
+  }
+  if (mInstanceData.mAntialias != AntialiasMode::NONE) {
+    if (mInstanceData.mAntialias == AntialiasMode::SUBPIXEL) {
+      options.render_mode = wr::FontRenderMode::Subpixel;
+      platformOptions.hinting = wr::FontHinting::LCD;
+      if (mInstanceData.mFlags & InstanceData::LCD_VERTICAL) {
+        options.flags |= wr::FontInstanceFlags::LCD_VERTICAL;
+      }
+      if (mInstanceData.mFlags & InstanceData::SUBPIXEL_BGR) {
+        options.flags |= wr::FontInstanceFlags::SUBPIXEL_BGR;
+      }
+    }
+
+    switch (mInstanceData.mLcdFilter) {
+      case FT_LCD_FILTER_NONE:
+        platformOptions.lcd_filter = wr::FontLCDFilter::None;
+        break;
+      case FT_LCD_FILTER_DEFAULT:
+        platformOptions.lcd_filter = wr::FontLCDFilter::Default;
+        break;
+      case FT_LCD_FILTER_LIGHT:
+        platformOptions.lcd_filter = wr::FontLCDFilter::Light;
+        break;
+      case FT_LCD_FILTER_LEGACY:
+      default:
+        break;
+    }
+
+    switch (mInstanceData.mHinting) {
+      case FontHinting::NONE:
+        platformOptions.hinting = wr::FontHinting::None;
+        break;
+      case FontHinting::LIGHT:
+        platformOptions.hinting = wr::FontHinting::Light;
+        break;
+      case FontHinting::NORMAL:
+        platformOptions.hinting = wr::FontHinting::Normal;
+        break;
+      case FontHinting::FULL:
+        break;
+    }
+  } else {
+    options.render_mode = wr::FontRenderMode::Mono;
+
+    switch (mInstanceData.mHinting) {
+      case FontHinting::NONE:
+        platformOptions.hinting = wr::FontHinting::None;
+        break;
+      default:
+        platformOptions.hinting = wr::FontHinting::Mono;
+        break;
+    }
+  }
+
+  *aOutOptions = Some(options);
+  *aOutPlatformOptions = Some(platformOptions);
+
+  if (HasVariationSettings()) {
+    UnscaledFontFreeType::GetVariationSettingsFromFace(aOutVariations,
+                                                       mFace->GetFace());
+  }
+
+  return true;
+}
+
+already_AddRefed<ScaledFont> UnscaledFontFontconfig::CreateScaledFont(
+    Float aSize, const uint8_t* aInstanceData, uint32_t aInstanceDataLength,
+    const FontVariation* aVariations, uint32_t aNumVariations) {
+  if (aInstanceDataLength < sizeof(ScaledFontFontconfig::InstanceData)) {
+    gfxWarning() << "Fontconfig scaled font instance data is truncated.";
+    return nullptr;
+  }
+  const ScaledFontFontconfig::InstanceData& instanceData =
+      *reinterpret_cast<const ScaledFontFontconfig::InstanceData*>(
+          aInstanceData);
+
+  RefPtr<SharedFTFace> face(InitFace());
+  if (!face) {
+    gfxWarning() << "Attempted to deserialize Fontconfig scaled font without "
+                    "FreeType face";
+    return nullptr;
+  }
+
+  if (aNumVariations > 0 && face->GetData()) {
+    if (RefPtr<SharedFTFace> varFace = face->GetData()->CloneFace()) {
+      face = varFace;
+    }
+  }
+
+  // Only apply variations if we have an explicitly cloned face.
+  if (aNumVariations > 0 && face != GetFace()) {
+    ApplyVariationsToFace(aVariations, aNumVariations, face->GetFace());
+  }
+
+  RefPtr<ScaledFontFontconfig> scaledFont =
+      new ScaledFontFontconfig(std::move(face), instanceData, this, aSize);
+
+  return scaledFont.forget();
+}
+
+already_AddRefed<ScaledFont> UnscaledFontFontconfig::CreateScaledFontFromWRFont(
+    Float aGlyphSize, const wr::FontInstanceOptions* aOptions,
+    const wr::FontInstancePlatformOptions* aPlatformOptions,
+    const FontVariation* aVariations, uint32_t aNumVariations) {
+  ScaledFontFontconfig::InstanceData instanceData(aOptions, aPlatformOptions);
+  return CreateScaledFont(aGlyphSize, reinterpret_cast<uint8_t*>(&instanceData),
+                          sizeof(instanceData), aVariations, aNumVariations);
+}
+
+bool ScaledFontFontconfig::HasVariationSettings() {
+  // Check if the FT face has been cloned.
+  return mFace &&
+         mFace->GetFace()->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS &&
+         mFace != static_cast<UnscaledFontFontconfig*>(mUnscaledFont.get())
+                      ->GetFace();
+}
+
+already_AddRefed<UnscaledFont> UnscaledFontFontconfig::CreateFromFontDescriptor(
+    const uint8_t* aData, uint32_t aDataLength, uint32_t aIndex) {
+  if (aDataLength == 0) {
+    gfxWarning() << "Fontconfig font descriptor is truncated.";
+    return nullptr;
+  }
+  const char* path = reinterpret_cast<const char*>(aData);
+  RefPtr<UnscaledFont> unscaledFont =
+      new UnscaledFontFontconfig(std::string(path, aDataLength), aIndex);
+  return unscaledFont.forget();
+}
+
+}  // namespace mozilla::gfx