Add m-esr52 at 52.6.0

1 files changed, 297 insertions, 0 deletions

diff --git a/gfx/src/nsFont.cpp b/gfx/src/nsFont.cpp
new file mode 100644
index 000000000..c5b1f09f0
--- /dev/null
+++ b/gfx/src/nsFont.cpp
@@ -0,0 +1,297 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsFont.h"
+#include "gfxFont.h"                    // for gfxFontStyle
+#include "gfxFontConstants.h"           // for NS_FONT_KERNING_AUTO, etc
+#include "gfxFontFeatures.h"            // for gfxFontFeature, etc
+#include "gfxFontUtils.h"               // for TRUETYPE_TAG
+#include "nsCRT.h"                      // for nsCRT
+#include "nsDebug.h"                    // for NS_ASSERTION
+#include "nsISupports.h"
+#include "nsUnicharUtils.h"
+#include "nscore.h"                     // for char16_t
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/gfx/2D.h"
+
+using namespace mozilla;
+
+nsFont::nsFont(const FontFamilyList& aFontlist, nscoord aSize)
+  : fontlist(aFontlist)
+{
+  Init();
+  size = aSize;
+}
+
+nsFont::nsFont(FontFamilyType aGenericType, nscoord aSize)
+  : fontlist(aGenericType)
+{
+  Init();
+  size = aSize;
+}
+
+void
+nsFont::Init()
+{
+  style = NS_FONT_STYLE_NORMAL;
+  weight = NS_FONT_WEIGHT_NORMAL;
+  stretch = NS_FONT_STRETCH_NORMAL;
+  systemFont = false;
+  smoothing = NS_FONT_SMOOTHING_AUTO;
+  sizeAdjust = -1.0f;
+  kerning = NS_FONT_KERNING_AUTO;
+  synthesis = NS_FONT_SYNTHESIS_WEIGHT | NS_FONT_SYNTHESIS_STYLE;
+
+  variantAlternates = 0;
+  variantCaps = NS_FONT_VARIANT_CAPS_NORMAL;
+  variantEastAsian = 0;
+  variantLigatures = 0;
+  variantNumeric = 0;
+  variantPosition = NS_FONT_VARIANT_POSITION_NORMAL;
+  variantWidth = NS_FONT_VARIANT_WIDTH_NORMAL;
+}
+
+nsFont::nsFont(const nsFont& aOther) = default;
+
+nsFont::nsFont()
+{
+}
+
+nsFont::~nsFont()
+{
+}
+
+bool nsFont::Equals(const nsFont& aOther) const
+{
+  if ((style == aOther.style) &&
+      (systemFont == aOther.systemFont) &&
+      (weight == aOther.weight) &&
+      (stretch == aOther.stretch) &&
+      (size == aOther.size) &&
+      (sizeAdjust == aOther.sizeAdjust) &&
+      (fontlist == aOther.fontlist) &&
+      (kerning == aOther.kerning) &&
+      (synthesis == aOther.synthesis) &&
+      (fontFeatureSettings == aOther.fontFeatureSettings) &&
+      (languageOverride == aOther.languageOverride) &&
+      (variantAlternates == aOther.variantAlternates) &&
+      (variantCaps == aOther.variantCaps) &&
+      (variantEastAsian == aOther.variantEastAsian) &&
+      (variantLigatures == aOther.variantLigatures) &&
+      (variantNumeric == aOther.variantNumeric) &&
+      (variantPosition == aOther.variantPosition) &&
+      (variantWidth == aOther.variantWidth) &&
+      (alternateValues == aOther.alternateValues) &&
+      (featureValueLookup == aOther.featureValueLookup) &&
+      (smoothing == aOther.smoothing)) {
+    return true;
+  }
+  return false;
+}
+
+nsFont& nsFont::operator=(const nsFont& aOther) = default;
+
+void
+nsFont::CopyAlternates(const nsFont& aOther)
+{
+  variantAlternates = aOther.variantAlternates;
+  alternateValues = aOther.alternateValues;
+  featureValueLookup = aOther.featureValueLookup;
+}
+
+// mapping from bitflag to font feature tag/value pair
+//
+// these need to be kept in sync with the constants listed
+// in gfxFontConstants.h (e.g. NS_FONT_VARIANT_EAST_ASIAN_JIS78)
+
+// NS_FONT_VARIANT_EAST_ASIAN_xxx values
+const gfxFontFeature eastAsianDefaults[] = {
+  { TRUETYPE_TAG('j','p','7','8'), 1 },
+  { TRUETYPE_TAG('j','p','8','3'), 1 },
+  { TRUETYPE_TAG('j','p','9','0'), 1 },
+  { TRUETYPE_TAG('j','p','0','4'), 1 },
+  { TRUETYPE_TAG('s','m','p','l'), 1 },
+  { TRUETYPE_TAG('t','r','a','d'), 1 },
+  { TRUETYPE_TAG('f','w','i','d'), 1 },
+  { TRUETYPE_TAG('p','w','i','d'), 1 },
+  { TRUETYPE_TAG('r','u','b','y'), 1 }
+};
+
+static_assert(MOZ_ARRAY_LENGTH(eastAsianDefaults) ==
+              eFeatureEastAsian_numFeatures,
+              "eFeatureEastAsian_numFeatures should be correct");
+
+// NS_FONT_VARIANT_LIGATURES_xxx values
+const gfxFontFeature ligDefaults[] = {
+  { TRUETYPE_TAG('l','i','g','a'), 0 },  // none value means all off
+  { TRUETYPE_TAG('l','i','g','a'), 1 },
+  { TRUETYPE_TAG('l','i','g','a'), 0 },
+  { TRUETYPE_TAG('d','l','i','g'), 1 },
+  { TRUETYPE_TAG('d','l','i','g'), 0 },
+  { TRUETYPE_TAG('h','l','i','g'), 1 },
+  { TRUETYPE_TAG('h','l','i','g'), 0 },
+  { TRUETYPE_TAG('c','a','l','t'), 1 },
+  { TRUETYPE_TAG('c','a','l','t'), 0 }
+};
+
+static_assert(MOZ_ARRAY_LENGTH(ligDefaults) ==
+              eFeatureLigatures_numFeatures,
+              "eFeatureLigatures_numFeatures should be correct");
+
+// NS_FONT_VARIANT_NUMERIC_xxx values
+const gfxFontFeature numericDefaults[] = {
+  { TRUETYPE_TAG('l','n','u','m'), 1 },
+  { TRUETYPE_TAG('o','n','u','m'), 1 },
+  { TRUETYPE_TAG('p','n','u','m'), 1 },
+  { TRUETYPE_TAG('t','n','u','m'), 1 },
+  { TRUETYPE_TAG('f','r','a','c'), 1 },
+  { TRUETYPE_TAG('a','f','r','c'), 1 },
+  { TRUETYPE_TAG('z','e','r','o'), 1 },
+  { TRUETYPE_TAG('o','r','d','n'), 1 }
+};
+
+static_assert(MOZ_ARRAY_LENGTH(numericDefaults) ==
+              eFeatureNumeric_numFeatures,
+              "eFeatureNumeric_numFeatures should be correct");
+
+static void
+AddFontFeaturesBitmask(uint32_t aValue, uint32_t aMin, uint32_t aMax,
+                      const gfxFontFeature aFeatureDefaults[],
+                      nsTArray<gfxFontFeature>& aFeaturesOut)
+
+{
+  uint32_t i, m;
+
+  for (i = 0, m = aMin; m <= aMax; i++, m <<= 1) {
+    if (m & aValue) {
+      const gfxFontFeature& feature = aFeatureDefaults[i];
+      aFeaturesOut.AppendElement(feature);
+    }
+  }
+}
+
+static uint32_t
+FontFeatureTagForVariantWidth(uint32_t aVariantWidth)
+{
+  switch (aVariantWidth) {
+    case NS_FONT_VARIANT_WIDTH_FULL:
+      return TRUETYPE_TAG('f','w','i','d');
+    case NS_FONT_VARIANT_WIDTH_HALF:
+      return TRUETYPE_TAG('h','w','i','d');
+    case NS_FONT_VARIANT_WIDTH_THIRD:
+      return TRUETYPE_TAG('t','w','i','d');
+    case NS_FONT_VARIANT_WIDTH_QUARTER:
+      return TRUETYPE_TAG('q','w','i','d');
+    default:
+      return 0;
+  }
+}
+
+void nsFont::AddFontFeaturesToStyle(gfxFontStyle *aStyle) const
+{
+  // add in font-variant features
+  gfxFontFeature setting;
+
+  // -- kerning
+  setting.mTag = TRUETYPE_TAG('k','e','r','n');
+  switch (kerning) {
+    case NS_FONT_KERNING_NONE:
+      setting.mValue = 0;
+      aStyle->featureSettings.AppendElement(setting);
+      break;
+    case NS_FONT_KERNING_NORMAL:
+      setting.mValue = 1;
+      aStyle->featureSettings.AppendElement(setting);
+      break;
+    default:
+      // auto case implies use user agent default
+      break;
+  }
+
+  // -- alternates
+  if (variantAlternates & NS_FONT_VARIANT_ALTERNATES_HISTORICAL) {
+    setting.mValue = 1;
+    setting.mTag = TRUETYPE_TAG('h','i','s','t');
+    aStyle->featureSettings.AppendElement(setting);
+  }
+
+  // -- copy font-specific alternate info into style
+  //    (this will be resolved after font-matching occurs)
+  aStyle->alternateValues.AppendElements(alternateValues);
+  aStyle->featureValueLookup = featureValueLookup;
+
+  // -- caps
+  aStyle->variantCaps = variantCaps;
+
+  // -- east-asian
+  if (variantEastAsian) {
+    AddFontFeaturesBitmask(variantEastAsian,
+                           NS_FONT_VARIANT_EAST_ASIAN_JIS78,
+                           NS_FONT_VARIANT_EAST_ASIAN_RUBY,
+                           eastAsianDefaults, aStyle->featureSettings);
+  }
+
+  // -- ligatures
+  if (variantLigatures) {
+    AddFontFeaturesBitmask(variantLigatures,
+                           NS_FONT_VARIANT_LIGATURES_NONE,
+                           NS_FONT_VARIANT_LIGATURES_NO_CONTEXTUAL,
+                           ligDefaults, aStyle->featureSettings);
+
+    if (variantLigatures & NS_FONT_VARIANT_LIGATURES_COMMON) {
+      // liga already enabled, need to enable clig also
+      setting.mTag = TRUETYPE_TAG('c','l','i','g');
+      setting.mValue = 1;
+      aStyle->featureSettings.AppendElement(setting);
+    } else if (variantLigatures & NS_FONT_VARIANT_LIGATURES_NO_COMMON) {
+      // liga already disabled, need to disable clig also
+      setting.mTag = TRUETYPE_TAG('c','l','i','g');
+      setting.mValue = 0;
+      aStyle->featureSettings.AppendElement(setting);
+    } else if (variantLigatures & NS_FONT_VARIANT_LIGATURES_NONE) {
+      // liga already disabled, need to disable dlig, hlig, calt, clig
+      setting.mValue = 0;
+      setting.mTag = TRUETYPE_TAG('d','l','i','g');
+      aStyle->featureSettings.AppendElement(setting);
+      setting.mTag = TRUETYPE_TAG('h','l','i','g');
+      aStyle->featureSettings.AppendElement(setting);
+      setting.mTag = TRUETYPE_TAG('c','a','l','t');
+      aStyle->featureSettings.AppendElement(setting);
+      setting.mTag = TRUETYPE_TAG('c','l','i','g');
+      aStyle->featureSettings.AppendElement(setting);
+    }
+  }
+
+  // -- numeric
+  if (variantNumeric) {
+    AddFontFeaturesBitmask(variantNumeric,
+                           NS_FONT_VARIANT_NUMERIC_LINING,
+                           NS_FONT_VARIANT_NUMERIC_ORDINAL,
+                           numericDefaults, aStyle->featureSettings);
+  }
+
+  // -- position
+  aStyle->variantSubSuper = variantPosition;
+
+  // -- width
+  setting.mTag = FontFeatureTagForVariantWidth(variantWidth);
+  if (setting.mTag) {
+    setting.mValue = 1;
+    aStyle->featureSettings.AppendElement(setting);
+  }
+
+  // indicate common-path case when neither variantCaps or variantSubSuper are set
+  aStyle->noFallbackVariantFeatures =
+    (aStyle->variantCaps == NS_FONT_VARIANT_CAPS_NORMAL) &&
+    (variantPosition == NS_FONT_VARIANT_POSITION_NORMAL);
+
+  // add in features from font-feature-settings
+  aStyle->featureSettings.AppendElements(fontFeatureSettings);
+
+  // enable grayscale antialiasing for text
+  if (smoothing == NS_FONT_SMOOTHING_GRAYSCALE) {
+    aStyle->useGrayscaleAntialiasing = true;
+  }
+}