зеркало из https://github.com/mozilla/gecko-dev.git
2223 строки
84 KiB
C++
2223 строки
84 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=4 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_FONT_H
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#define GFX_FONT_H
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#include "gfxTypes.h"
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#include "gfxFontEntry.h"
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#include "gfxFontVariations.h"
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#include "nsString.h"
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#include "gfxPoint.h"
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#include "gfxPattern.h"
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#include "nsTArray.h"
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#include "nsTHashtable.h"
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#include "nsHashKeys.h"
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#include "gfxRect.h"
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#include "nsExpirationTracker.h"
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#include "gfxPlatform.h"
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#include "nsAtom.h"
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#include "mozilla/HashFunctions.h"
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#include "nsIMemoryReporter.h"
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#include "nsIObserver.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/FontPropertyTypes.h"
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#include "mozilla/TypedEnumBits.h"
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#include "MainThreadUtils.h"
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#include <algorithm>
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#include "DrawMode.h"
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#include "nsDataHashtable.h"
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#include "harfbuzz/hb.h"
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#include "mozilla/gfx/2D.h"
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#include "nsColor.h"
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#include "nsFontMetrics.h"
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#include "mozilla/ServoUtils.h"
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#include "TextDrawTarget.h"
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typedef struct _cairo cairo_t;
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typedef struct _cairo_scaled_font cairo_scaled_font_t;
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#ifdef DEBUG
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# include <stdio.h>
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#endif
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class gfxContext;
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class gfxTextRun;
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class gfxFont;
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class gfxGlyphExtents;
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class gfxShapedText;
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class gfxShapedWord;
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class gfxSkipChars;
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class gfxMathTable;
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#define FONT_MAX_SIZE 2000.0
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#define SMALL_CAPS_SCALE_FACTOR 0.8
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// The skew factor used for synthetic-italic [oblique] fonts;
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// we use a platform-dependent value to harmonize with the platform's own APIs.
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#ifdef XP_WIN
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# define OBLIQUE_SKEW_FACTOR 0.3f
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#elif defined(MOZ_WIDGET_GTK)
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# define OBLIQUE_SKEW_FACTOR 0.2f
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#else
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# define OBLIQUE_SKEW_FACTOR 0.25f
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#endif
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struct gfxTextRunDrawCallbacks;
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namespace mozilla {
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class SVGContextPaint;
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} // namespace mozilla
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struct gfxFontStyle {
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typedef mozilla::FontStretch FontStretch;
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typedef mozilla::FontSlantStyle FontSlantStyle;
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typedef mozilla::FontWeight FontWeight;
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gfxFontStyle();
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gfxFontStyle(FontSlantStyle aStyle, FontWeight aWeight, FontStretch aStretch,
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gfxFloat aSize, nsAtom* aLanguage, bool aExplicitLanguage,
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float aSizeAdjust, bool aSystemFont, bool aPrinterFont,
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bool aWeightSynthesis, bool aStyleSynthesis,
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uint32_t aLanguageOverride);
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// the language (may be an internal langGroup code rather than an actual
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// language code) specified in the document or element's lang property,
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// or inferred from the charset
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RefPtr<nsAtom> language;
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// Features are composed of (1) features from style rules (2) features
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// from feature settings rules and (3) family-specific features. (1) and
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// (3) are guaranteed to be mutually exclusive
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// custom opentype feature settings
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nsTArray<gfxFontFeature> featureSettings;
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// Some font-variant property values require font-specific settings
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// defined via @font-feature-values rules. These are resolved after
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// font matching occurs.
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// -- list of value tags for specific alternate features
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mozilla::StyleVariantAlternatesList variantAlternates;
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// -- object used to look these up once the font is matched
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RefPtr<gfxFontFeatureValueSet> featureValueLookup;
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// opentype variation settings
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nsTArray<gfxFontVariation> variationSettings;
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// The logical size of the font, in pixels
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gfxFloat size;
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// The aspect-value (ie., the ratio actualsize:actualxheight) that any
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// actual physical font created from this font structure must have when
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// rendering or measuring a string. A value of -1.0 means no adjustment
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// needs to be done; otherwise the value must be nonnegative.
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float sizeAdjust;
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// baseline offset, used when simulating sub/superscript glyphs
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float baselineOffset;
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// Language system tag, to override document language;
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// an OpenType "language system" tag represented as a 32-bit integer
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// (see http://www.microsoft.com/typography/otspec/languagetags.htm).
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// Normally 0, so font rendering will use the document or element language
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// (see above) to control any language-specific rendering, but the author
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// can override this for cases where the options implemented in the font
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// do not directly match the actual language. (E.g. lang may be Macedonian,
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// but the font in use does not explicitly support this; the author can
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// use font-language-override to request the Serbian option in the font
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// in order to get correct glyph shapes.)
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uint32_t languageOverride;
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// The estimated background color behind the text. Enables a special
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// rendering mode when NS_GET_A(.) > 0. Only used for text in the chrome.
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nscolor fontSmoothingBackgroundColor;
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// The Font{Weight,Stretch,SlantStyle} fields are each a 16-bit type.
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// The weight of the font: 100, 200, ... 900.
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FontWeight weight;
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// The stretch of the font
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FontStretch stretch;
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// The style of font
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FontSlantStyle style;
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// Whether face-selection properties weight/style/stretch are all 'normal'
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bool IsNormalStyle() const {
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return weight.IsNormal() && style.IsNormal() && stretch.IsNormal();
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}
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// We pack these two small-integer fields into a single byte to avoid
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// overflowing an 8-byte boundary [in a 64-bit build] and ending up with
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// 7 bytes of padding at the end of the struct.
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// caps variant (small-caps, petite-caps, etc.)
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uint8_t variantCaps : 4; // uses range 0..6
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// sub/superscript variant
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uint8_t variantSubSuper : 4; // uses range 0..2
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// Say that this font is a system font and therefore does not
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// require certain fixup that we do for fonts from untrusted
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// sources.
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bool systemFont : 1;
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// Say that this font is used for print or print preview.
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bool printerFont : 1;
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// Used to imitate -webkit-font-smoothing: antialiased
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bool useGrayscaleAntialiasing : 1;
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// Whether synthetic styles are allowed
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bool allowSyntheticWeight : 1;
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bool allowSyntheticStyle : 1;
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// some variant features require fallback which complicates the shaping
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// code, so set up a bool to indicate when shaping with fallback is needed
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bool noFallbackVariantFeatures : 1;
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// whether the |language| field comes from explicit lang tagging in the
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// document, or was inferred from charset/system locale
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bool explicitLanguage : 1;
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// Return the final adjusted font size for the given aspect ratio.
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// Not meant to be called when sizeAdjust = -1.0.
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gfxFloat GetAdjustedSize(gfxFloat aspect) const {
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NS_ASSERTION(sizeAdjust >= 0.0,
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"Not meant to be called when sizeAdjust = -1.0");
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gfxFloat adjustedSize =
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std::max(NS_round(size * (sizeAdjust / aspect)), 1.0);
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return std::min(adjustedSize, FONT_MAX_SIZE);
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}
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PLDHashNumber Hash() const;
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// Adjust this style to simulate sub/superscript (as requested in the
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// variantSubSuper field) using size and baselineOffset instead.
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void AdjustForSubSuperscript(int32_t aAppUnitsPerDevPixel);
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// Should this style cause the given font entry to use synthetic bold?
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bool NeedsSyntheticBold(gfxFontEntry* aFontEntry) const {
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return weight.IsBold() && allowSyntheticWeight &&
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!aFontEntry->SupportsBold();
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}
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bool Equals(const gfxFontStyle& other) const {
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return (*reinterpret_cast<const uint64_t*>(&size) ==
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*reinterpret_cast<const uint64_t*>(&other.size)) &&
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(style == other.style) && (weight == other.weight) &&
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(stretch == other.stretch) && (variantCaps == other.variantCaps) &&
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(variantSubSuper == other.variantSubSuper) &&
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(allowSyntheticWeight == other.allowSyntheticWeight) &&
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(allowSyntheticStyle == other.allowSyntheticStyle) &&
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(systemFont == other.systemFont) &&
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(printerFont == other.printerFont) &&
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(useGrayscaleAntialiasing == other.useGrayscaleAntialiasing) &&
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(explicitLanguage == other.explicitLanguage) &&
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(language == other.language) &&
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(baselineOffset == other.baselineOffset) &&
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(*reinterpret_cast<const uint32_t*>(&sizeAdjust) ==
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*reinterpret_cast<const uint32_t*>(&other.sizeAdjust)) &&
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(featureSettings == other.featureSettings) &&
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(variantAlternates == other.variantAlternates) &&
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(featureValueLookup == other.featureValueLookup) &&
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(variationSettings == other.variationSettings) &&
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(languageOverride == other.languageOverride) &&
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(fontSmoothingBackgroundColor == other.fontSmoothingBackgroundColor);
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}
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};
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/**
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* Font cache design:
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*
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* The mFonts hashtable contains most fonts, indexed by (gfxFontEntry*, style).
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* It does not add a reference to the fonts it contains.
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* When a font's refcount decreases to zero, instead of deleting it we
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* add it to our expiration tracker.
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* The expiration tracker tracks fonts with zero refcount. After a certain
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* period of time, such fonts expire and are deleted.
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*
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* We're using 3 generations with a ten-second generation interval, so
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* zero-refcount fonts will be deleted 20-30 seconds after their refcount
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* goes to zero, if timer events fire in a timely manner.
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*
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* The font cache also handles timed expiration of cached ShapedWords
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* for "persistent" fonts: it has a repeating timer, and notifies
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* each cached font to "age" its shaped words. The words will be released
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* by the fonts if they get aged three times without being re-used in the
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* meantime.
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*
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* Note that the ShapedWord timeout is much larger than the font timeout,
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* so that in the case of a short-lived font, we'll discard the gfxFont
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* completely, with all its words, and avoid the cost of aging the words
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* individually. That only happens with longer-lived fonts.
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*/
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struct FontCacheSizes {
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FontCacheSizes() : mFontInstances(0), mShapedWords(0) {}
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size_t mFontInstances; // memory used by instances of gfxFont subclasses
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size_t mShapedWords; // memory used by the per-font shapedWord caches
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};
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class gfxFontCacheExpirationTracker
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: public ExpirationTrackerImpl<gfxFont, 3, ::detail::PlaceholderLock,
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::detail::PlaceholderAutoLock> {
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protected:
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typedef ::detail::PlaceholderLock Lock;
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typedef ::detail::PlaceholderAutoLock AutoLock;
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Lock mLock;
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AutoLock FakeLock() { return AutoLock(mLock); }
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Lock& GetMutex() override {
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mozilla::AssertIsMainThreadOrServoFontMetricsLocked();
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return mLock;
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}
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public:
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enum { FONT_TIMEOUT_SECONDS = 10 };
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explicit gfxFontCacheExpirationTracker(nsIEventTarget* aEventTarget)
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: ExpirationTrackerImpl<gfxFont, 3, Lock, AutoLock>(
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FONT_TIMEOUT_SECONDS * 1000, "gfxFontCache", aEventTarget) {}
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};
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class gfxFontCache final : private gfxFontCacheExpirationTracker {
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public:
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enum { SHAPED_WORD_TIMEOUT_SECONDS = 60 };
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explicit gfxFontCache(nsIEventTarget* aEventTarget);
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~gfxFontCache();
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/*
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* Get the global gfxFontCache. You must call Init() before
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* calling this method --- the result will not be null.
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*/
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static gfxFontCache* GetCache() { return gGlobalCache; }
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static nsresult Init();
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// It's OK to call this even if Init() has not been called.
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static void Shutdown();
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// Look up a font in the cache. Returns null if there's nothing matching
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// in the cache
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gfxFont* Lookup(const gfxFontEntry* aFontEntry, const gfxFontStyle* aStyle,
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const gfxCharacterMap* aUnicodeRangeMap);
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// We created a new font (presumably because Lookup returned null);
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// put it in the cache. The font's refcount should be nonzero. It is
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// allowable to add a new font even if there is one already in the
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// cache with the same key; we'll forget about the old one.
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void AddNew(gfxFont* aFont);
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// The font's refcount has gone to zero; give ownership of it to
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// the cache. We delete it if it's not acquired again after a certain
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// amount of time.
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void NotifyReleased(gfxFont* aFont);
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// Cleans out the hashtable and removes expired fonts waiting for cleanup.
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// Other gfxFont objects may be still in use but they will be pushed
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// into the expiration queues and removed.
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void Flush() {
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mFonts.Clear();
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AgeAllGenerations();
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}
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void FlushShapedWordCaches();
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void NotifyGlyphsChanged();
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void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const;
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void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
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FontCacheSizes* aSizes) const;
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void AgeAllGenerations() { AgeAllGenerationsLocked(FakeLock()); }
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void RemoveObject(gfxFont* aFont) { RemoveObjectLocked(aFont, FakeLock()); }
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protected:
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class MemoryReporter final : public nsIMemoryReporter {
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~MemoryReporter() {}
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIMEMORYREPORTER
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};
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// Observer for notifications that the font cache cares about
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class Observer final : public nsIObserver {
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~Observer() {}
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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};
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nsresult AddObject(gfxFont* aFont) {
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return AddObjectLocked(aFont, FakeLock());
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}
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// This gets called when the timeout has expired on a zero-refcount
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// font; we just delete it.
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void NotifyExpiredLocked(gfxFont* aFont, const AutoLock&) override {
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NotifyExpired(aFont);
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}
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void NotifyExpired(gfxFont* aFont);
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void DestroyFont(gfxFont* aFont);
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static gfxFontCache* gGlobalCache;
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struct MOZ_STACK_CLASS Key {
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const gfxFontEntry* mFontEntry;
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const gfxFontStyle* mStyle;
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const gfxCharacterMap* mUnicodeRangeMap;
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Key(const gfxFontEntry* aFontEntry, const gfxFontStyle* aStyle,
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const gfxCharacterMap* aUnicodeRangeMap)
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: mFontEntry(aFontEntry),
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mStyle(aStyle),
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mUnicodeRangeMap(aUnicodeRangeMap) {}
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};
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class HashEntry : public PLDHashEntryHdr {
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public:
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typedef const Key& KeyType;
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typedef const Key* KeyTypePointer;
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// When constructing a new entry in the hashtable, we'll leave this
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// blank. The caller of Put() will fill this in.
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explicit HashEntry(KeyTypePointer aStr) : mFont(nullptr) {}
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HashEntry(const HashEntry& toCopy) : mFont(toCopy.mFont) {}
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~HashEntry() {}
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bool KeyEquals(const KeyTypePointer aKey) const;
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey) {
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return mozilla::HashGeneric(aKey->mStyle->Hash(), aKey->mFontEntry,
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aKey->mUnicodeRangeMap);
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}
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enum { ALLOW_MEMMOVE = true };
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// The cache tracks gfxFont objects whose refcount has dropped to zero,
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// so they are not immediately deleted but may be "resurrected" if they
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// have not yet expired from the tracker when they are needed again.
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// See the custom AddRef/Release methods in gfxFont.
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gfxFont* MOZ_UNSAFE_REF("tracking for deferred deletion") mFont;
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};
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nsTHashtable<HashEntry> mFonts;
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static void WordCacheExpirationTimerCallback(nsITimer* aTimer, void* aCache);
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nsCOMPtr<nsITimer> mWordCacheExpirationTimer;
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};
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class gfxTextPerfMetrics {
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public:
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struct TextCounts {
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uint32_t numContentTextRuns;
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uint32_t numChromeTextRuns;
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uint32_t numChars;
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uint32_t maxTextRunLen;
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uint32_t wordCacheSpaceRules;
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uint32_t wordCacheLong;
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uint32_t wordCacheHit;
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uint32_t wordCacheMiss;
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uint32_t fallbackPrefs;
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uint32_t fallbackSystem;
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uint32_t textrunConst;
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uint32_t textrunDestr;
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uint32_t genericLookups;
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};
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uint32_t reflowCount;
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// counts per reflow operation
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TextCounts current;
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// totals for the lifetime of a document
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TextCounts cumulative;
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gfxTextPerfMetrics() { memset(this, 0, sizeof(gfxTextPerfMetrics)); }
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// add current totals to cumulative ones
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void Accumulate() {
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if (current.numChars == 0) {
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return;
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}
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cumulative.numContentTextRuns += current.numContentTextRuns;
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cumulative.numChromeTextRuns += current.numChromeTextRuns;
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cumulative.numChars += current.numChars;
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if (current.maxTextRunLen > cumulative.maxTextRunLen) {
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cumulative.maxTextRunLen = current.maxTextRunLen;
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}
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cumulative.wordCacheSpaceRules += current.wordCacheSpaceRules;
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cumulative.wordCacheLong += current.wordCacheLong;
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cumulative.wordCacheHit += current.wordCacheHit;
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cumulative.wordCacheMiss += current.wordCacheMiss;
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cumulative.fallbackPrefs += current.fallbackPrefs;
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cumulative.fallbackSystem += current.fallbackSystem;
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cumulative.textrunConst += current.textrunConst;
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cumulative.textrunDestr += current.textrunDestr;
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cumulative.genericLookups += current.genericLookups;
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memset(¤t, 0, sizeof(current));
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}
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};
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namespace mozilla {
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namespace gfx {
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// Flags that live in the gfxShapedText::mFlags field.
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// (Note that gfxTextRun has an additional mFlags2 field for use
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// by textrun clients like nsTextFrame.)
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enum class ShapedTextFlags : uint16_t {
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/**
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* When set, the text is RTL.
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*/
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TEXT_IS_RTL = 0x0001,
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/**
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* When set, spacing is enabled and the textrun needs to call GetSpacing
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* on the spacing provider.
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*/
|
|
TEXT_ENABLE_SPACING = 0x0002,
|
|
/**
|
|
* When set, the text has no characters above 255 and it is stored
|
|
* in the textrun in 8-bit format.
|
|
*/
|
|
TEXT_IS_8BIT = 0x0004,
|
|
/**
|
|
* When set, GetHyphenationBreaks may return true for some character
|
|
* positions, otherwise it will always return false for all characters.
|
|
*/
|
|
TEXT_ENABLE_HYPHEN_BREAKS = 0x0008,
|
|
/**
|
|
* When set, the RunMetrics::mBoundingBox field will be initialized
|
|
* properly based on glyph extents, in particular, glyph extents that
|
|
* overflow the standard font-box (the box defined by the ascent, descent
|
|
* and advance width of the glyph). When not set, it may just be the
|
|
* standard font-box even if glyphs overflow.
|
|
*/
|
|
TEXT_NEED_BOUNDING_BOX = 0x0010,
|
|
/**
|
|
* When set, optional ligatures are disabled. Ligatures that are
|
|
* required for legible text should still be enabled.
|
|
*/
|
|
TEXT_DISABLE_OPTIONAL_LIGATURES = 0x0020,
|
|
/**
|
|
* When set, the textrun should favour speed of construction over
|
|
* quality. This may involve disabling ligatures and/or kerning or
|
|
* other effects.
|
|
*/
|
|
TEXT_OPTIMIZE_SPEED = 0x0040,
|
|
/**
|
|
* When set, the textrun should discard control characters instead of
|
|
* turning them into hexboxes.
|
|
*/
|
|
TEXT_HIDE_CONTROL_CHARACTERS = 0x0080,
|
|
|
|
/**
|
|
* nsTextFrameThebes sets these, but they're defined here rather than
|
|
* in nsTextFrameUtils.h because ShapedWord creation/caching also needs
|
|
* to check the _INCOMING flag
|
|
*/
|
|
TEXT_TRAILING_ARABICCHAR = 0x0100,
|
|
/**
|
|
* When set, the previous character for this textrun was an Arabic
|
|
* character. This is used for the context detection necessary for
|
|
* bidi.numeral implementation.
|
|
*/
|
|
TEXT_INCOMING_ARABICCHAR = 0x0200,
|
|
|
|
/**
|
|
* Set if the textrun should use the OpenType 'math' script.
|
|
*/
|
|
TEXT_USE_MATH_SCRIPT = 0x0400,
|
|
|
|
/*
|
|
* Bit 0x0800 is currently unused.
|
|
*/
|
|
|
|
/**
|
|
* Field for orientation of the textrun and glyphs within it.
|
|
* Possible values of the TEXT_ORIENT_MASK field:
|
|
* TEXT_ORIENT_HORIZONTAL
|
|
* TEXT_ORIENT_VERTICAL_UPRIGHT
|
|
* TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT
|
|
* TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT
|
|
* TEXT_ORIENT_VERTICAL_MIXED
|
|
* For all VERTICAL settings, the x and y coordinates of glyph
|
|
* positions are exchanged, so that simple advances are vertical.
|
|
*
|
|
* The MIXED value indicates vertical textRuns for which the CSS
|
|
* text-orientation property is 'mixed', but is never used for
|
|
* individual glyphRuns; it will be resolved to either UPRIGHT
|
|
* or SIDEWAYS_RIGHT according to the UTR50 properties of the
|
|
* characters, and separate glyphRuns created for the resulting
|
|
* glyph orientations.
|
|
*/
|
|
TEXT_ORIENT_MASK = 0x7000,
|
|
TEXT_ORIENT_HORIZONTAL = 0x0000,
|
|
TEXT_ORIENT_VERTICAL_UPRIGHT = 0x1000,
|
|
TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT = 0x2000,
|
|
TEXT_ORIENT_VERTICAL_MIXED = 0x3000,
|
|
TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT = 0x4000,
|
|
};
|
|
|
|
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ShapedTextFlags)
|
|
} // namespace gfx
|
|
} // namespace mozilla
|
|
|
|
class gfxTextRunFactory {
|
|
// Used by stylo
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(gfxTextRunFactory)
|
|
|
|
public:
|
|
typedef mozilla::gfx::DrawTarget DrawTarget;
|
|
|
|
/**
|
|
* This record contains all the parameters needed to initialize a textrun.
|
|
*/
|
|
struct MOZ_STACK_CLASS Parameters {
|
|
// Shape text params suggesting where the textrun will be rendered
|
|
DrawTarget* mDrawTarget;
|
|
// Pointer to arbitrary user data (which should outlive the textrun)
|
|
void* mUserData;
|
|
// A description of which characters have been stripped from the original
|
|
// DOM string to produce the characters in the textrun. May be null
|
|
// if that information is not relevant.
|
|
gfxSkipChars* mSkipChars;
|
|
// A list of where linebreaks are currently placed in the textrun. May
|
|
// be null if mInitialBreakCount is zero.
|
|
uint32_t* mInitialBreaks;
|
|
uint32_t mInitialBreakCount;
|
|
// The ratio to use to convert device pixels to application layout units
|
|
int32_t mAppUnitsPerDevUnit;
|
|
};
|
|
|
|
protected:
|
|
// Protected destructor, to discourage deletion outside of Release():
|
|
virtual ~gfxTextRunFactory();
|
|
};
|
|
|
|
/**
|
|
* gfxFontShaper
|
|
*
|
|
* This class implements text shaping (character to glyph mapping and
|
|
* glyph layout). There is a gfxFontShaper subclass for each text layout
|
|
* technology (uniscribe, core text, harfbuzz,....) we support.
|
|
*
|
|
* The shaper is responsible for setting up glyph data in gfxTextRuns.
|
|
*
|
|
* A generic, platform-independent shaper relies only on the standard
|
|
* gfxFont interface and can work with any concrete subclass of gfxFont.
|
|
*
|
|
* Platform-specific implementations designed to interface to platform
|
|
* shaping APIs such as Uniscribe or CoreText may rely on features of a
|
|
* specific font subclass to access native font references
|
|
* (such as CTFont, HFONT, DWriteFont, etc).
|
|
*/
|
|
|
|
class gfxFontShaper {
|
|
public:
|
|
typedef mozilla::gfx::DrawTarget DrawTarget;
|
|
typedef mozilla::unicode::Script Script;
|
|
|
|
enum class RoundingFlags : uint8_t { kRoundX = 0x01, kRoundY = 0x02 };
|
|
|
|
explicit gfxFontShaper(gfxFont* aFont) : mFont(aFont) {
|
|
NS_ASSERTION(aFont, "shaper requires a valid font!");
|
|
}
|
|
|
|
virtual ~gfxFontShaper() = default;
|
|
|
|
// Shape a piece of text and store the resulting glyph data into
|
|
// aShapedText. Parameters aOffset/aLength indicate the range of
|
|
// aShapedText to be updated; aLength is also the length of aText.
|
|
virtual bool ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
|
|
uint32_t aOffset, uint32_t aLength, Script aScript,
|
|
bool aVertical, RoundingFlags aRounding,
|
|
gfxShapedText* aShapedText) = 0;
|
|
|
|
gfxFont* GetFont() const { return mFont; }
|
|
|
|
static void MergeFontFeatures(
|
|
const gfxFontStyle* aStyle, const nsTArray<gfxFontFeature>& aFontFeatures,
|
|
bool aDisableLigatures, const nsACString& aFamilyName, bool aAddSmallCaps,
|
|
void (*aHandleFeature)(const uint32_t&, uint32_t&, void*),
|
|
void* aHandleFeatureData);
|
|
|
|
protected:
|
|
// the font this shaper is working with. The font owns a UniquePtr reference
|
|
// to this object, and will destroy it before it dies. Thus, mFont will always
|
|
// be valid.
|
|
gfxFont* MOZ_NON_OWNING_REF mFont;
|
|
};
|
|
|
|
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(gfxFontShaper::RoundingFlags)
|
|
|
|
/*
|
|
* gfxShapedText is an abstract superclass for gfxShapedWord and gfxTextRun.
|
|
* These are objects that store a list of zero or more glyphs for each
|
|
* character. For each glyph we store the glyph ID, the advance, and possibly
|
|
* x/y-offsets. The idea is that a string is rendered by a loop that draws each
|
|
* glyph at its designated offset from the current point, then advances the
|
|
* current point by the glyph's advance in the direction of the textrun (LTR or
|
|
* RTL). Each glyph advance is always rounded to the nearest appunit; this
|
|
* ensures consistent results when dividing the text in a textrun into multiple
|
|
* text frames (frame boundaries are always aligned to appunits). We optimize
|
|
* for the case where a character has a single glyph and zero xoffset and
|
|
* yoffset, and the glyph ID and advance are in a reasonable range so we can
|
|
* pack all necessary data into 32 bits.
|
|
*
|
|
* gfxFontShaper can shape text into either a gfxShapedWord (cached by a
|
|
* gfxFont) or directly into a gfxTextRun (for cases where we want to shape
|
|
* textruns in their entirety rather than using cached words, because there may
|
|
* be layout features that depend on the inter-word spaces).
|
|
*/
|
|
class gfxShapedText {
|
|
public:
|
|
typedef mozilla::unicode::Script Script;
|
|
|
|
gfxShapedText(uint32_t aLength, mozilla::gfx::ShapedTextFlags aFlags,
|
|
uint16_t aAppUnitsPerDevUnit)
|
|
: mLength(aLength),
|
|
mFlags(aFlags),
|
|
mAppUnitsPerDevUnit(aAppUnitsPerDevUnit) {}
|
|
|
|
virtual ~gfxShapedText() = default;
|
|
|
|
/**
|
|
* This class records the information associated with a character in the
|
|
* input string. It's optimized for the case where there is one glyph
|
|
* representing that character alone.
|
|
*
|
|
* A character can have zero or more associated glyphs. Each glyph
|
|
* has an advance width and an x and y offset.
|
|
* A character may be the start of a cluster.
|
|
* A character may be the start of a ligature group.
|
|
* A character can be "missing", indicating that the system is unable
|
|
* to render the character.
|
|
*
|
|
* All characters in a ligature group conceptually share all the glyphs
|
|
* associated with the characters in a group.
|
|
*/
|
|
class CompressedGlyph {
|
|
public:
|
|
enum {
|
|
// Indicates that a cluster and ligature group starts at this
|
|
// character; this character has a single glyph with a reasonable
|
|
// advance and zero offsets. A "reasonable" advance
|
|
// is one that fits in the available bits (currently 12) (specified
|
|
// in appunits).
|
|
FLAG_IS_SIMPLE_GLYPH = 0x80000000U,
|
|
|
|
// Indicates whether a linebreak is allowed before this character;
|
|
// this is a two-bit field that holds a FLAG_BREAK_TYPE_xxx value
|
|
// indicating the kind of linebreak (if any) allowed here.
|
|
FLAGS_CAN_BREAK_BEFORE = 0x60000000U,
|
|
|
|
FLAGS_CAN_BREAK_SHIFT = 29,
|
|
FLAG_BREAK_TYPE_NONE = 0,
|
|
FLAG_BREAK_TYPE_NORMAL = 1,
|
|
FLAG_BREAK_TYPE_HYPHEN = 2,
|
|
|
|
FLAG_CHAR_IS_SPACE = 0x10000000U,
|
|
|
|
// The advance is stored in appunits
|
|
ADVANCE_MASK = 0x0FFF0000U,
|
|
ADVANCE_SHIFT = 16,
|
|
|
|
GLYPH_MASK = 0x0000FFFFU,
|
|
|
|
// Non-simple glyphs may or may not have glyph data in the
|
|
// corresponding mDetailedGlyphs entry. They have the following
|
|
// flag bits:
|
|
|
|
// When NOT set, indicates that this character corresponds to a
|
|
// missing glyph and should be skipped (or possibly, render the character
|
|
// Unicode value in some special way). If there are glyphs,
|
|
// the mGlyphID is actually the UTF16 character code. The bit is
|
|
// inverted so we can memset the array to zero to indicate all missing.
|
|
FLAG_NOT_MISSING = 0x01,
|
|
FLAG_NOT_CLUSTER_START = 0x02,
|
|
FLAG_NOT_LIGATURE_GROUP_START = 0x04,
|
|
|
|
FLAG_CHAR_IS_TAB = 0x08,
|
|
FLAG_CHAR_IS_NEWLINE = 0x10,
|
|
// Per CSS Text Decoration Module Level 3, emphasis marks are not
|
|
// drawn for any character in Unicode categories Z*, Cc, Cf, and Cn
|
|
// which is not combined with any combining characters. This flag is
|
|
// set for all those characters except 0x20 whitespace.
|
|
FLAG_CHAR_NO_EMPHASIS_MARK = 0x20,
|
|
// Per CSS Text, letter-spacing is not applied to formatting chars
|
|
// (category Cf). We mark those in the textrun so as to be able to
|
|
// skip them when setting up spacing in nsTextFrame.
|
|
FLAG_CHAR_IS_FORMATTING_CONTROL = 0x40,
|
|
|
|
CHAR_TYPE_FLAGS_MASK = 0x78,
|
|
|
|
GLYPH_COUNT_MASK = 0x00FFFF00U,
|
|
GLYPH_COUNT_SHIFT = 8
|
|
};
|
|
|
|
// "Simple glyphs" have a simple glyph ID, simple advance and their
|
|
// x and y offsets are zero. Also the glyph extents do not overflow
|
|
// the font-box defined by the font ascent, descent and glyph advance width.
|
|
// These case is optimized to avoid storing DetailedGlyphs.
|
|
|
|
// Returns true if the glyph ID aGlyph fits into the compressed
|
|
// representation
|
|
static bool IsSimpleGlyphID(uint32_t aGlyph) {
|
|
return (aGlyph & GLYPH_MASK) == aGlyph;
|
|
}
|
|
// Returns true if the advance aAdvance fits into the compressed
|
|
// representation. aAdvance is in appunits.
|
|
static bool IsSimpleAdvance(uint32_t aAdvance) {
|
|
return (aAdvance & (ADVANCE_MASK >> ADVANCE_SHIFT)) == aAdvance;
|
|
}
|
|
|
|
bool IsSimpleGlyph() const { return (mValue & FLAG_IS_SIMPLE_GLYPH) != 0; }
|
|
uint32_t GetSimpleAdvance() const {
|
|
return (mValue & ADVANCE_MASK) >> ADVANCE_SHIFT;
|
|
}
|
|
uint32_t GetSimpleGlyph() const { return mValue & GLYPH_MASK; }
|
|
|
|
bool IsMissing() const {
|
|
return (mValue & (FLAG_NOT_MISSING | FLAG_IS_SIMPLE_GLYPH)) == 0;
|
|
}
|
|
bool IsClusterStart() const {
|
|
return (mValue & FLAG_IS_SIMPLE_GLYPH) ||
|
|
!(mValue & FLAG_NOT_CLUSTER_START);
|
|
}
|
|
bool IsLigatureGroupStart() const {
|
|
return (mValue & FLAG_IS_SIMPLE_GLYPH) ||
|
|
!(mValue & FLAG_NOT_LIGATURE_GROUP_START);
|
|
}
|
|
bool IsLigatureContinuation() const {
|
|
return (mValue & FLAG_IS_SIMPLE_GLYPH) == 0 &&
|
|
(mValue & (FLAG_NOT_LIGATURE_GROUP_START | FLAG_NOT_MISSING)) ==
|
|
(FLAG_NOT_LIGATURE_GROUP_START | FLAG_NOT_MISSING);
|
|
}
|
|
|
|
// Return true if the original character was a normal (breakable,
|
|
// trimmable) space (U+0020). Not true for other characters that
|
|
// may happen to map to the space glyph (U+00A0).
|
|
bool CharIsSpace() const { return (mValue & FLAG_CHAR_IS_SPACE) != 0; }
|
|
|
|
bool CharIsTab() const {
|
|
return !IsSimpleGlyph() && (mValue & FLAG_CHAR_IS_TAB) != 0;
|
|
}
|
|
bool CharIsNewline() const {
|
|
return !IsSimpleGlyph() && (mValue & FLAG_CHAR_IS_NEWLINE) != 0;
|
|
}
|
|
bool CharMayHaveEmphasisMark() const {
|
|
return !CharIsSpace() &&
|
|
(IsSimpleGlyph() || !(mValue & FLAG_CHAR_NO_EMPHASIS_MARK));
|
|
}
|
|
bool CharIsFormattingControl() const {
|
|
return !IsSimpleGlyph() &&
|
|
(mValue & FLAG_CHAR_IS_FORMATTING_CONTROL) != 0;
|
|
}
|
|
|
|
uint32_t CharTypeFlags() const {
|
|
return IsSimpleGlyph() ? 0 : (mValue & CHAR_TYPE_FLAGS_MASK);
|
|
}
|
|
|
|
void SetClusterStart(bool aIsClusterStart) {
|
|
NS_ASSERTION(!IsSimpleGlyph(),
|
|
"can't call SetClusterStart on simple glyphs");
|
|
if (aIsClusterStart) {
|
|
mValue &= ~FLAG_NOT_CLUSTER_START;
|
|
} else {
|
|
mValue |= FLAG_NOT_CLUSTER_START;
|
|
}
|
|
}
|
|
|
|
uint8_t CanBreakBefore() const {
|
|
return (mValue & FLAGS_CAN_BREAK_BEFORE) >> FLAGS_CAN_BREAK_SHIFT;
|
|
}
|
|
// Returns FLAGS_CAN_BREAK_BEFORE if the setting changed, 0 otherwise
|
|
uint32_t SetCanBreakBefore(uint8_t aCanBreakBefore) {
|
|
NS_ASSERTION(aCanBreakBefore <= 2, "Bogus break-before value!");
|
|
uint32_t breakMask = (uint32_t(aCanBreakBefore) << FLAGS_CAN_BREAK_SHIFT);
|
|
uint32_t toggle = breakMask ^ (mValue & FLAGS_CAN_BREAK_BEFORE);
|
|
mValue ^= toggle;
|
|
return toggle;
|
|
}
|
|
|
|
// Create a CompressedGlyph value representing a simple glyph with
|
|
// no extra flags (line-break or is_space) set.
|
|
static CompressedGlyph MakeSimpleGlyph(uint32_t aAdvanceAppUnits,
|
|
uint32_t aGlyph) {
|
|
NS_ASSERTION(IsSimpleAdvance(aAdvanceAppUnits), "Advance overflow");
|
|
NS_ASSERTION(IsSimpleGlyphID(aGlyph), "Glyph overflow");
|
|
CompressedGlyph g;
|
|
g.mValue =
|
|
FLAG_IS_SIMPLE_GLYPH | (aAdvanceAppUnits << ADVANCE_SHIFT) | aGlyph;
|
|
return g;
|
|
}
|
|
|
|
// Assign a simple glyph value to an existing CompressedGlyph record,
|
|
// preserving line-break/is-space flags if present.
|
|
CompressedGlyph& SetSimpleGlyph(uint32_t aAdvanceAppUnits,
|
|
uint32_t aGlyph) {
|
|
NS_ASSERTION(!CharTypeFlags(), "Char type flags lost");
|
|
mValue = (mValue & (FLAGS_CAN_BREAK_BEFORE | FLAG_CHAR_IS_SPACE)) |
|
|
MakeSimpleGlyph(aAdvanceAppUnits, aGlyph).mValue;
|
|
return *this;
|
|
}
|
|
|
|
// Create a CompressedGlyph value representing a complex glyph record,
|
|
// without any line-break or char-type flags.
|
|
static CompressedGlyph MakeComplex(bool aClusterStart, bool aLigatureStart,
|
|
uint32_t aGlyphCount) {
|
|
CompressedGlyph g;
|
|
g.mValue = FLAG_NOT_MISSING |
|
|
(aClusterStart ? 0 : FLAG_NOT_CLUSTER_START) |
|
|
(aLigatureStart ? 0 : FLAG_NOT_LIGATURE_GROUP_START) |
|
|
(aGlyphCount << GLYPH_COUNT_SHIFT);
|
|
return g;
|
|
}
|
|
|
|
// Assign a complex glyph value to an existing CompressedGlyph record,
|
|
// preserving line-break/char-type flags if present.
|
|
CompressedGlyph& SetComplex(bool aClusterStart, bool aLigatureStart,
|
|
uint32_t aGlyphCount) {
|
|
mValue = (mValue & (FLAGS_CAN_BREAK_BEFORE | FLAG_CHAR_IS_SPACE)) |
|
|
CharTypeFlags() |
|
|
MakeComplex(aClusterStart, aLigatureStart, aGlyphCount).mValue;
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Missing glyphs are treated as ligature group starts; don't mess with
|
|
* the cluster-start flag (see bugs 618870 and 619286).
|
|
*/
|
|
CompressedGlyph& SetMissing(uint32_t aGlyphCount) {
|
|
mValue = (mValue & (FLAGS_CAN_BREAK_BEFORE | FLAG_NOT_CLUSTER_START |
|
|
FLAG_CHAR_IS_SPACE)) |
|
|
CharTypeFlags() | (aGlyphCount << GLYPH_COUNT_SHIFT);
|
|
return *this;
|
|
}
|
|
uint32_t GetGlyphCount() const {
|
|
NS_ASSERTION(!IsSimpleGlyph(), "Expected non-simple-glyph");
|
|
return (mValue & GLYPH_COUNT_MASK) >> GLYPH_COUNT_SHIFT;
|
|
}
|
|
|
|
void SetIsSpace() { mValue |= FLAG_CHAR_IS_SPACE; }
|
|
void SetIsTab() {
|
|
NS_ASSERTION(!IsSimpleGlyph(), "Expected non-simple-glyph");
|
|
mValue |= FLAG_CHAR_IS_TAB;
|
|
}
|
|
void SetIsNewline() {
|
|
NS_ASSERTION(!IsSimpleGlyph(), "Expected non-simple-glyph");
|
|
mValue |= FLAG_CHAR_IS_NEWLINE;
|
|
}
|
|
void SetNoEmphasisMark() {
|
|
NS_ASSERTION(!IsSimpleGlyph(), "Expected non-simple-glyph");
|
|
mValue |= FLAG_CHAR_NO_EMPHASIS_MARK;
|
|
}
|
|
void SetIsFormattingControl() {
|
|
NS_ASSERTION(!IsSimpleGlyph(), "Expected non-simple-glyph");
|
|
mValue |= FLAG_CHAR_IS_FORMATTING_CONTROL;
|
|
}
|
|
|
|
private:
|
|
uint32_t mValue;
|
|
};
|
|
|
|
// Accessor for the array of CompressedGlyph records, which will be in
|
|
// a different place in gfxShapedWord vs gfxTextRun
|
|
virtual const CompressedGlyph* GetCharacterGlyphs() const = 0;
|
|
virtual CompressedGlyph* GetCharacterGlyphs() = 0;
|
|
|
|
/**
|
|
* When the glyphs for a character don't fit into a CompressedGlyph record
|
|
* in SimpleGlyph format, we use an array of DetailedGlyphs instead.
|
|
*/
|
|
struct DetailedGlyph {
|
|
// The glyphID, or the Unicode character if this is a missing glyph
|
|
uint32_t mGlyphID;
|
|
// The advance of the glyph, in appunits.
|
|
// mAdvance is in the text direction (RTL or LTR),
|
|
// and will normally be non-negative (although this is not guaranteed)
|
|
int32_t mAdvance;
|
|
// The offset from the glyph's default position, in line-relative
|
|
// coordinates (so mOffset.x is an offset in the line-right direction,
|
|
// and mOffset.y is an offset in line-downwards direction).
|
|
// These values are in floating-point appUnits.
|
|
mozilla::gfx::Point mOffset;
|
|
};
|
|
|
|
void SetGlyphs(uint32_t aCharIndex, CompressedGlyph aGlyph,
|
|
const DetailedGlyph* aGlyphs);
|
|
|
|
void SetMissingGlyph(uint32_t aIndex, uint32_t aChar, gfxFont* aFont);
|
|
|
|
void SetIsSpace(uint32_t aIndex) {
|
|
GetCharacterGlyphs()[aIndex].SetIsSpace();
|
|
}
|
|
|
|
bool HasDetailedGlyphs() const { return mDetailedGlyphs != nullptr; }
|
|
|
|
bool IsLigatureGroupStart(uint32_t aPos) {
|
|
NS_ASSERTION(aPos < GetLength(), "aPos out of range");
|
|
return GetCharacterGlyphs()[aPos].IsLigatureGroupStart();
|
|
}
|
|
|
|
// NOTE that this must not be called for a character offset that does
|
|
// not have any DetailedGlyph records; callers must have verified that
|
|
// GetCharacterGlyphs()[aCharIndex].GetGlyphCount() is greater than zero.
|
|
DetailedGlyph* GetDetailedGlyphs(uint32_t aCharIndex) const {
|
|
NS_ASSERTION(GetCharacterGlyphs() && HasDetailedGlyphs() &&
|
|
!GetCharacterGlyphs()[aCharIndex].IsSimpleGlyph() &&
|
|
GetCharacterGlyphs()[aCharIndex].GetGlyphCount() > 0,
|
|
"invalid use of GetDetailedGlyphs; check the caller!");
|
|
return mDetailedGlyphs->Get(aCharIndex);
|
|
}
|
|
|
|
void AdjustAdvancesForSyntheticBold(float aSynBoldOffset, uint32_t aOffset,
|
|
uint32_t aLength);
|
|
|
|
// Mark clusters in the CompressedGlyph records, starting at aOffset,
|
|
// based on the Unicode properties of the text in aString.
|
|
// This is also responsible to set the IsSpace flag for space characters.
|
|
void SetupClusterBoundaries(uint32_t aOffset, const char16_t* aString,
|
|
uint32_t aLength);
|
|
// In 8-bit text, there won't actually be any clusters, but we still need
|
|
// the space-marking functionality.
|
|
void SetupClusterBoundaries(uint32_t aOffset, const uint8_t* aString,
|
|
uint32_t aLength);
|
|
|
|
mozilla::gfx::ShapedTextFlags GetFlags() const { return mFlags; }
|
|
|
|
bool IsVertical() const {
|
|
return (GetFlags() & mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_MASK) !=
|
|
mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_HORIZONTAL;
|
|
}
|
|
|
|
bool UseCenterBaseline() const {
|
|
mozilla::gfx::ShapedTextFlags orient =
|
|
GetFlags() & mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_MASK;
|
|
return orient ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_MIXED ||
|
|
orient ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT;
|
|
}
|
|
|
|
bool IsRightToLeft() const {
|
|
return (GetFlags() & mozilla::gfx::ShapedTextFlags::TEXT_IS_RTL) ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_IS_RTL;
|
|
}
|
|
|
|
bool IsSidewaysLeft() const {
|
|
return (GetFlags() & mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_MASK) ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
|
|
}
|
|
|
|
// Return true if the logical inline direction is reversed compared to
|
|
// normal physical coordinates (i.e. if it is leftwards or upwards)
|
|
bool IsInlineReversed() const { return IsSidewaysLeft() != IsRightToLeft(); }
|
|
|
|
gfxFloat GetDirection() const { return IsInlineReversed() ? -1.0f : 1.0f; }
|
|
|
|
bool DisableLigatures() const {
|
|
return (GetFlags() &
|
|
mozilla::gfx::ShapedTextFlags::TEXT_DISABLE_OPTIONAL_LIGATURES) ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_DISABLE_OPTIONAL_LIGATURES;
|
|
}
|
|
|
|
bool TextIs8Bit() const {
|
|
return (GetFlags() & mozilla::gfx::ShapedTextFlags::TEXT_IS_8BIT) ==
|
|
mozilla::gfx::ShapedTextFlags::TEXT_IS_8BIT;
|
|
}
|
|
|
|
int32_t GetAppUnitsPerDevUnit() const { return mAppUnitsPerDevUnit; }
|
|
|
|
uint32_t GetLength() const { return mLength; }
|
|
|
|
bool FilterIfIgnorable(uint32_t aIndex, uint32_t aCh);
|
|
|
|
protected:
|
|
// Allocate aCount DetailedGlyphs for the given index
|
|
DetailedGlyph* AllocateDetailedGlyphs(uint32_t aCharIndex, uint32_t aCount);
|
|
|
|
// Ensure the glyph on the given index is complex glyph so that we can use
|
|
// it to record specific characters that layout may need to detect.
|
|
void EnsureComplexGlyph(uint32_t aIndex, CompressedGlyph& aGlyph) {
|
|
MOZ_ASSERT(GetCharacterGlyphs() + aIndex == &aGlyph);
|
|
if (aGlyph.IsSimpleGlyph()) {
|
|
DetailedGlyph details = {aGlyph.GetSimpleGlyph(),
|
|
(int32_t)aGlyph.GetSimpleAdvance(),
|
|
mozilla::gfx::Point()};
|
|
SetGlyphs(aIndex, CompressedGlyph().SetComplex(true, true, 1), &details);
|
|
}
|
|
}
|
|
|
|
// For characters whose glyph data does not fit the "simple" glyph criteria
|
|
// in CompressedGlyph, we use a sorted array to store the association
|
|
// between the source character offset and an index into an array
|
|
// DetailedGlyphs. The CompressedGlyph record includes a count of
|
|
// the number of DetailedGlyph records that belong to the character,
|
|
// starting at the given index.
|
|
class DetailedGlyphStore {
|
|
public:
|
|
DetailedGlyphStore() : mLastUsed(0) {}
|
|
|
|
// This is optimized for the most common calling patterns:
|
|
// we rarely need random access to the records, access is most commonly
|
|
// sequential through the textRun, so we record the last-used index
|
|
// and check whether the caller wants the same record again, or the
|
|
// next; if not, it's most likely we're starting over from the start
|
|
// of the run, so we check the first entry before resorting to binary
|
|
// search as a last resort.
|
|
// NOTE that this must not be called for a character offset that does
|
|
// not have any DetailedGlyph records; callers must have verified that
|
|
// mCharacterGlyphs[aOffset].GetGlyphCount() is greater than zero
|
|
// before calling this, otherwise the assertions here will fire (in a
|
|
// debug build), and we'll probably crash.
|
|
DetailedGlyph* Get(uint32_t aOffset) {
|
|
NS_ASSERTION(mOffsetToIndex.Length() > 0, "no detailed glyph records!");
|
|
DetailedGlyph* details = mDetails.Elements();
|
|
// check common cases (fwd iteration, initial entry, etc) first
|
|
if (mLastUsed < mOffsetToIndex.Length() - 1 &&
|
|
aOffset == mOffsetToIndex[mLastUsed + 1].mOffset) {
|
|
++mLastUsed;
|
|
} else if (aOffset == mOffsetToIndex[0].mOffset) {
|
|
mLastUsed = 0;
|
|
} else if (aOffset == mOffsetToIndex[mLastUsed].mOffset) {
|
|
// do nothing
|
|
} else if (mLastUsed > 0 &&
|
|
aOffset == mOffsetToIndex[mLastUsed - 1].mOffset) {
|
|
--mLastUsed;
|
|
} else {
|
|
mLastUsed = mOffsetToIndex.BinaryIndexOf(aOffset, CompareToOffset());
|
|
}
|
|
NS_ASSERTION(mLastUsed != nsTArray<DGRec>::NoIndex,
|
|
"detailed glyph record missing!");
|
|
return details + mOffsetToIndex[mLastUsed].mIndex;
|
|
}
|
|
|
|
DetailedGlyph* Allocate(uint32_t aOffset, uint32_t aCount) {
|
|
uint32_t detailIndex = mDetails.Length();
|
|
DetailedGlyph* details = mDetails.AppendElements(aCount);
|
|
// We normally set up glyph records sequentially, so the common case
|
|
// here is to append new records to the mOffsetToIndex array;
|
|
// test for that before falling back to the InsertElementSorted
|
|
// method.
|
|
if (mOffsetToIndex.Length() == 0 ||
|
|
aOffset > mOffsetToIndex[mOffsetToIndex.Length() - 1].mOffset) {
|
|
mOffsetToIndex.AppendElement(DGRec(aOffset, detailIndex));
|
|
} else {
|
|
mOffsetToIndex.InsertElementSorted(DGRec(aOffset, detailIndex),
|
|
CompareRecordOffsets());
|
|
}
|
|
return details;
|
|
}
|
|
|
|
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) {
|
|
return aMallocSizeOf(this) +
|
|
mDetails.ShallowSizeOfExcludingThis(aMallocSizeOf) +
|
|
mOffsetToIndex.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
private:
|
|
struct DGRec {
|
|
DGRec(const uint32_t& aOffset, const uint32_t& aIndex)
|
|
: mOffset(aOffset), mIndex(aIndex) {}
|
|
uint32_t mOffset; // source character offset in the textrun
|
|
uint32_t mIndex; // index where this char's DetailedGlyphs begin
|
|
};
|
|
|
|
struct CompareToOffset {
|
|
bool Equals(const DGRec& a, const uint32_t& b) const {
|
|
return a.mOffset == b;
|
|
}
|
|
bool LessThan(const DGRec& a, const uint32_t& b) const {
|
|
return a.mOffset < b;
|
|
}
|
|
};
|
|
|
|
struct CompareRecordOffsets {
|
|
bool Equals(const DGRec& a, const DGRec& b) const {
|
|
return a.mOffset == b.mOffset;
|
|
}
|
|
bool LessThan(const DGRec& a, const DGRec& b) const {
|
|
return a.mOffset < b.mOffset;
|
|
}
|
|
};
|
|
|
|
// Concatenated array of all the DetailedGlyph records needed for the
|
|
// textRun; individual character offsets are associated with indexes
|
|
// into this array via the mOffsetToIndex table.
|
|
nsTArray<DetailedGlyph> mDetails;
|
|
|
|
// For each character offset that needs DetailedGlyphs, we record the
|
|
// index in mDetails where the list of glyphs begins. This array is
|
|
// sorted by mOffset.
|
|
nsTArray<DGRec> mOffsetToIndex;
|
|
|
|
// Records the most recently used index into mOffsetToIndex, so that
|
|
// we can support sequential access more quickly than just doing
|
|
// a binary search each time.
|
|
nsTArray<DGRec>::index_type mLastUsed;
|
|
};
|
|
|
|
mozilla::UniquePtr<DetailedGlyphStore> mDetailedGlyphs;
|
|
|
|
// Number of char16_t characters and CompressedGlyph glyph records
|
|
uint32_t mLength;
|
|
|
|
// Shaping flags (direction, ligature-suppression)
|
|
mozilla::gfx::ShapedTextFlags mFlags;
|
|
|
|
uint16_t mAppUnitsPerDevUnit;
|
|
};
|
|
|
|
/*
|
|
* gfxShapedWord: an individual (space-delimited) run of text shaped with a
|
|
* particular font, without regard to external context.
|
|
*
|
|
* The glyph data is copied into gfxTextRuns as needed from the cache of
|
|
* ShapedWords associated with each gfxFont instance.
|
|
*/
|
|
class gfxShapedWord final : public gfxShapedText {
|
|
public:
|
|
typedef mozilla::unicode::Script Script;
|
|
|
|
// Create a ShapedWord that can hold glyphs for aLength characters,
|
|
// with mCharacterGlyphs sized appropriately.
|
|
//
|
|
// Returns null on allocation failure (does NOT use infallible alloc)
|
|
// so caller must check for success.
|
|
//
|
|
// This does NOT perform shaping, so the returned word contains no
|
|
// glyph data; the caller must call gfxFont::ShapeText() with appropriate
|
|
// parameters to set up the glyphs.
|
|
static gfxShapedWord* Create(const uint8_t* aText, uint32_t aLength,
|
|
Script aRunScript, uint16_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags,
|
|
gfxFontShaper::RoundingFlags aRounding) {
|
|
NS_ASSERTION(aLength <= gfxPlatform::GetPlatform()->WordCacheCharLimit(),
|
|
"excessive length for gfxShapedWord!");
|
|
|
|
// Compute size needed including the mCharacterGlyphs array
|
|
// and a copy of the original text
|
|
uint32_t size = offsetof(gfxShapedWord, mCharGlyphsStorage) +
|
|
aLength * (sizeof(CompressedGlyph) + sizeof(uint8_t));
|
|
void* storage = malloc(size);
|
|
if (!storage) {
|
|
return nullptr;
|
|
}
|
|
|
|
// Construct in the pre-allocated storage, using placement new
|
|
return new (storage) gfxShapedWord(aText, aLength, aRunScript,
|
|
aAppUnitsPerDevUnit, aFlags, aRounding);
|
|
}
|
|
|
|
static gfxShapedWord* Create(const char16_t* aText, uint32_t aLength,
|
|
Script aRunScript, uint16_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags,
|
|
gfxFontShaper::RoundingFlags aRounding) {
|
|
NS_ASSERTION(aLength <= gfxPlatform::GetPlatform()->WordCacheCharLimit(),
|
|
"excessive length for gfxShapedWord!");
|
|
|
|
// In the 16-bit version of Create, if the TEXT_IS_8BIT flag is set,
|
|
// then we convert the text to an 8-bit version and call the 8-bit
|
|
// Create function instead.
|
|
if (aFlags & mozilla::gfx::ShapedTextFlags::TEXT_IS_8BIT) {
|
|
nsAutoCString narrowText;
|
|
LossyAppendUTF16toASCII(nsDependentSubstring(aText, aLength), narrowText);
|
|
return Create((const uint8_t*)(narrowText.BeginReading()), aLength,
|
|
aRunScript, aAppUnitsPerDevUnit, aFlags, aRounding);
|
|
}
|
|
|
|
uint32_t size = offsetof(gfxShapedWord, mCharGlyphsStorage) +
|
|
aLength * (sizeof(CompressedGlyph) + sizeof(char16_t));
|
|
void* storage = malloc(size);
|
|
if (!storage) {
|
|
return nullptr;
|
|
}
|
|
|
|
return new (storage) gfxShapedWord(aText, aLength, aRunScript,
|
|
aAppUnitsPerDevUnit, aFlags, aRounding);
|
|
}
|
|
|
|
// Override operator delete to properly free the object that was
|
|
// allocated via malloc.
|
|
void operator delete(void* p) { free(p); }
|
|
|
|
const CompressedGlyph* GetCharacterGlyphs() const override {
|
|
return &mCharGlyphsStorage[0];
|
|
}
|
|
CompressedGlyph* GetCharacterGlyphs() override {
|
|
return &mCharGlyphsStorage[0];
|
|
}
|
|
|
|
const uint8_t* Text8Bit() const {
|
|
NS_ASSERTION(TextIs8Bit(), "invalid use of Text8Bit()");
|
|
return reinterpret_cast<const uint8_t*>(mCharGlyphsStorage + GetLength());
|
|
}
|
|
|
|
const char16_t* TextUnicode() const {
|
|
NS_ASSERTION(!TextIs8Bit(), "invalid use of TextUnicode()");
|
|
return reinterpret_cast<const char16_t*>(mCharGlyphsStorage + GetLength());
|
|
}
|
|
|
|
char16_t GetCharAt(uint32_t aOffset) const {
|
|
NS_ASSERTION(aOffset < GetLength(), "aOffset out of range");
|
|
return TextIs8Bit() ? char16_t(Text8Bit()[aOffset])
|
|
: TextUnicode()[aOffset];
|
|
}
|
|
|
|
Script GetScript() const { return mScript; }
|
|
|
|
gfxFontShaper::RoundingFlags GetRounding() const { return mRounding; }
|
|
|
|
void ResetAge() { mAgeCounter = 0; }
|
|
uint32_t IncrementAge() { return ++mAgeCounter; }
|
|
|
|
// Helper used when hashing a word for the shaped-word caches
|
|
static uint32_t HashMix(uint32_t aHash, char16_t aCh) {
|
|
return (aHash >> 28) ^ (aHash << 4) ^ aCh;
|
|
}
|
|
|
|
private:
|
|
// so that gfxTextRun can share our DetailedGlyphStore class
|
|
friend class gfxTextRun;
|
|
|
|
// Construct storage for a ShapedWord, ready to receive glyph data
|
|
gfxShapedWord(const uint8_t* aText, uint32_t aLength, Script aRunScript,
|
|
uint16_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags,
|
|
gfxFontShaper::RoundingFlags aRounding)
|
|
: gfxShapedText(aLength,
|
|
aFlags | mozilla::gfx::ShapedTextFlags::TEXT_IS_8BIT,
|
|
aAppUnitsPerDevUnit),
|
|
mScript(aRunScript),
|
|
mRounding(aRounding),
|
|
mAgeCounter(0) {
|
|
memset(mCharGlyphsStorage, 0, aLength * sizeof(CompressedGlyph));
|
|
uint8_t* text = reinterpret_cast<uint8_t*>(&mCharGlyphsStorage[aLength]);
|
|
memcpy(text, aText, aLength * sizeof(uint8_t));
|
|
}
|
|
|
|
gfxShapedWord(const char16_t* aText, uint32_t aLength, Script aRunScript,
|
|
uint16_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags,
|
|
gfxFontShaper::RoundingFlags aRounding)
|
|
: gfxShapedText(aLength, aFlags, aAppUnitsPerDevUnit),
|
|
mScript(aRunScript),
|
|
mRounding(aRounding),
|
|
mAgeCounter(0) {
|
|
memset(mCharGlyphsStorage, 0, aLength * sizeof(CompressedGlyph));
|
|
char16_t* text = reinterpret_cast<char16_t*>(&mCharGlyphsStorage[aLength]);
|
|
memcpy(text, aText, aLength * sizeof(char16_t));
|
|
SetupClusterBoundaries(0, aText, aLength);
|
|
}
|
|
|
|
Script mScript;
|
|
|
|
gfxFontShaper::RoundingFlags mRounding;
|
|
|
|
uint32_t mAgeCounter;
|
|
|
|
// The mCharGlyphsStorage array is actually a variable-size member;
|
|
// when the ShapedWord is created, its size will be increased as necessary
|
|
// to allow the proper number of glyphs to be stored.
|
|
// The original text, in either 8-bit or 16-bit form, will be stored
|
|
// immediately following the CompressedGlyphs.
|
|
CompressedGlyph mCharGlyphsStorage[1];
|
|
};
|
|
|
|
class GlyphBufferAzure;
|
|
struct TextRunDrawParams;
|
|
struct FontDrawParams;
|
|
struct EmphasisMarkDrawParams;
|
|
|
|
class gfxFont {
|
|
friend class gfxHarfBuzzShaper;
|
|
friend class gfxGraphiteShaper;
|
|
|
|
protected:
|
|
typedef mozilla::gfx::DrawTarget DrawTarget;
|
|
typedef mozilla::unicode::Script Script;
|
|
typedef mozilla::SVGContextPaint SVGContextPaint;
|
|
|
|
typedef gfxFontShaper::RoundingFlags RoundingFlags;
|
|
|
|
public:
|
|
typedef mozilla::FontSlantStyle FontSlantStyle;
|
|
|
|
nsrefcnt AddRef(void) {
|
|
MOZ_ASSERT(int32_t(mRefCnt) >= 0, "illegal refcnt");
|
|
if (mExpirationState.IsTracked()) {
|
|
gfxFontCache::GetCache()->RemoveObject(this);
|
|
}
|
|
++mRefCnt;
|
|
NS_LOG_ADDREF(this, mRefCnt, "gfxFont", sizeof(*this));
|
|
return mRefCnt;
|
|
}
|
|
nsrefcnt Release(void) {
|
|
MOZ_ASSERT(0 != mRefCnt, "dup release");
|
|
--mRefCnt;
|
|
NS_LOG_RELEASE(this, mRefCnt, "gfxFont");
|
|
if (mRefCnt == 0) {
|
|
NotifyReleased();
|
|
// |this| may have been deleted.
|
|
return 0;
|
|
}
|
|
return mRefCnt;
|
|
}
|
|
|
|
int32_t GetRefCount() { return mRefCnt; }
|
|
|
|
// options to specify the kind of AA to be used when creating a font
|
|
typedef enum : uint8_t {
|
|
kAntialiasDefault,
|
|
kAntialiasNone,
|
|
kAntialiasGrayscale,
|
|
kAntialiasSubpixel
|
|
} AntialiasOption;
|
|
|
|
protected:
|
|
nsAutoRefCnt mRefCnt;
|
|
|
|
void NotifyReleased() {
|
|
gfxFontCache* cache = gfxFontCache::GetCache();
|
|
if (cache) {
|
|
// Don't delete just yet; return the object to the cache for
|
|
// possibly recycling within some time limit
|
|
cache->NotifyReleased(this);
|
|
} else {
|
|
// The cache may have already been shut down.
|
|
delete this;
|
|
}
|
|
}
|
|
|
|
gfxFont(const RefPtr<mozilla::gfx::UnscaledFont>& aUnscaledFont,
|
|
gfxFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
|
|
AntialiasOption anAAOption = kAntialiasDefault);
|
|
|
|
public:
|
|
virtual ~gfxFont();
|
|
|
|
bool Valid() const { return mIsValid; }
|
|
|
|
// options for the kind of bounding box to return from measurement
|
|
typedef enum {
|
|
LOOSE_INK_EXTENTS,
|
|
// A box that encloses all the painted pixels, and may
|
|
// include sidebearings and/or additional ascent/descent
|
|
// within the glyph cell even if the ink is smaller.
|
|
TIGHT_INK_EXTENTS,
|
|
// A box that tightly encloses all the painted pixels
|
|
// (although actually on Windows, at least, it may be
|
|
// slightly larger than strictly necessary because
|
|
// we can't get precise extents with ClearType).
|
|
TIGHT_HINTED_OUTLINE_EXTENTS
|
|
// A box that tightly encloses the glyph outline,
|
|
// ignoring possible antialiasing pixels that extend
|
|
// beyond this.
|
|
// NOTE: The default implementation of gfxFont::Measure(),
|
|
// which works with the glyph extents cache, does not
|
|
// differentiate between this and TIGHT_INK_EXTENTS.
|
|
// Whether the distinction is important depends on the
|
|
// antialiasing behavior of the platform; currently the
|
|
// distinction is only implemented in the gfxWindowsFont
|
|
// subclass, because of ClearType's tendency to paint
|
|
// outside the hinted outline.
|
|
// Also NOTE: it is relatively expensive to request this,
|
|
// as it does not use cached glyph extents in the font.
|
|
} BoundingBoxType;
|
|
|
|
const nsCString& GetName() const { return mFontEntry->Name(); }
|
|
const gfxFontStyle* GetStyle() const { return &mStyle; }
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|
|
|
virtual mozilla::UniquePtr<gfxFont> CopyWithAntialiasOption(
|
|
AntialiasOption anAAOption) {
|
|
// platforms where this actually matters should override
|
|
return nullptr;
|
|
}
|
|
|
|
gfxFloat GetAdjustedSize() const {
|
|
return mAdjustedSize > 0.0 ? mAdjustedSize
|
|
: (mStyle.sizeAdjust == 0.0 ? 0.0 : mStyle.size);
|
|
}
|
|
|
|
float FUnitsToDevUnitsFactor() const {
|
|
// check this was set up during font initialization
|
|
NS_ASSERTION(mFUnitsConvFactor >= 0.0f, "mFUnitsConvFactor not valid");
|
|
return mFUnitsConvFactor;
|
|
}
|
|
|
|
// check whether this is an sfnt we can potentially use with harfbuzz
|
|
bool FontCanSupportHarfBuzz() { return mFontEntry->HasCmapTable(); }
|
|
|
|
// check whether this is an sfnt we can potentially use with Graphite
|
|
bool FontCanSupportGraphite() { return mFontEntry->HasGraphiteTables(); }
|
|
|
|
// Whether this is a font that may be doing full-color rendering,
|
|
// and therefore needs us to use a mask for text-shadow even when
|
|
// we're not actually blurring.
|
|
bool AlwaysNeedsMaskForShadow() {
|
|
return mFontEntry->TryGetColorGlyphs() || mFontEntry->TryGetSVGData(this) ||
|
|
mFontEntry->HasFontTable(TRUETYPE_TAG('C', 'B', 'D', 'T')) ||
|
|
mFontEntry->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x'));
|
|
}
|
|
|
|
// whether a feature is supported by the font (limited to a small set
|
|
// of features for which some form of fallback needs to be implemented)
|
|
bool SupportsFeature(Script aScript, uint32_t aFeatureTag);
|
|
|
|
// whether the font supports "real" small caps, petite caps etc.
|
|
// aFallbackToSmallCaps true when petite caps should fallback to small caps
|
|
bool SupportsVariantCaps(Script aScript, uint32_t aVariantCaps,
|
|
bool& aFallbackToSmallCaps,
|
|
bool& aSyntheticLowerToSmallCaps,
|
|
bool& aSyntheticUpperToSmallCaps);
|
|
|
|
// whether the font supports subscript/superscript feature
|
|
// for fallback, need to verify that all characters in the run
|
|
// have variant substitutions
|
|
bool SupportsSubSuperscript(uint32_t aSubSuperscript, const uint8_t* aString,
|
|
uint32_t aLength, Script aRunScript);
|
|
|
|
bool SupportsSubSuperscript(uint32_t aSubSuperscript, const char16_t* aString,
|
|
uint32_t aLength, Script aRunScript);
|
|
|
|
// whether the specified feature will apply to the given character
|
|
bool FeatureWillHandleChar(Script aRunScript, uint32_t aFeature,
|
|
uint32_t aUnicode);
|
|
|
|
// Subclasses may choose to look up glyph ids for characters.
|
|
// If they do not override this, gfxHarfBuzzShaper will fetch the cmap
|
|
// table and use that.
|
|
virtual bool ProvidesGetGlyph() const { return false; }
|
|
// Map unicode character to glyph ID.
|
|
// Only used if ProvidesGetGlyph() returns true.
|
|
virtual uint32_t GetGlyph(uint32_t unicode, uint32_t variation_selector) {
|
|
return 0;
|
|
}
|
|
// Return the horizontal advance of a glyph.
|
|
gfxFloat GetGlyphHAdvance(DrawTarget* aDrawTarget, uint16_t aGID);
|
|
|
|
gfxFloat SynthesizeSpaceWidth(uint32_t aCh);
|
|
|
|
// Work out whether cairo will snap inter-glyph spacing to pixels
|
|
// when rendering to the given drawTarget.
|
|
RoundingFlags GetRoundOffsetsToPixels(DrawTarget* aDrawTarget);
|
|
|
|
virtual bool ShouldHintMetrics() const { return true; }
|
|
virtual bool ShouldRoundXOffset(cairo_t* aCairo) const { return true; }
|
|
|
|
// Font metrics
|
|
struct Metrics {
|
|
gfxFloat capHeight;
|
|
gfxFloat xHeight;
|
|
gfxFloat strikeoutSize;
|
|
gfxFloat strikeoutOffset;
|
|
gfxFloat underlineSize;
|
|
gfxFloat underlineOffset;
|
|
|
|
gfxFloat internalLeading;
|
|
gfxFloat externalLeading;
|
|
|
|
gfxFloat emHeight;
|
|
gfxFloat emAscent;
|
|
gfxFloat emDescent;
|
|
gfxFloat maxHeight;
|
|
gfxFloat maxAscent;
|
|
gfxFloat maxDescent;
|
|
gfxFloat maxAdvance;
|
|
|
|
gfxFloat aveCharWidth;
|
|
gfxFloat spaceWidth;
|
|
gfxFloat zeroWidth; // -1 if there was no zero glyph
|
|
|
|
gfxFloat ZeroOrAveCharWidth() const {
|
|
return zeroWidth >= 0 ? zeroWidth : aveCharWidth;
|
|
}
|
|
};
|
|
|
|
typedef nsFontMetrics::FontOrientation Orientation;
|
|
|
|
const Metrics& GetMetrics(Orientation aOrientation) {
|
|
if (aOrientation == nsFontMetrics::eHorizontal) {
|
|
return GetHorizontalMetrics();
|
|
}
|
|
if (!mVerticalMetrics) {
|
|
mVerticalMetrics = CreateVerticalMetrics();
|
|
}
|
|
return *mVerticalMetrics;
|
|
}
|
|
|
|
/**
|
|
* We let layout specify spacing on either side of any
|
|
* character. We need to specify both before and after
|
|
* spacing so that substring measurement can do the right things.
|
|
* These values are in appunits. They're always an integral number of
|
|
* appunits, but we specify them in floats in case very large spacing
|
|
* values are required.
|
|
*/
|
|
struct Spacing {
|
|
gfxFloat mBefore;
|
|
gfxFloat mAfter;
|
|
};
|
|
/**
|
|
* Metrics for a particular string
|
|
*/
|
|
struct RunMetrics {
|
|
RunMetrics() { mAdvanceWidth = mAscent = mDescent = 0.0; }
|
|
|
|
void CombineWith(const RunMetrics& aOther, bool aOtherIsOnLeft);
|
|
|
|
// can be negative (partly due to negative spacing).
|
|
// Advance widths should be additive: the advance width of the
|
|
// (offset1, length1) plus the advance width of (offset1 + length1,
|
|
// length2) should be the advance width of (offset1, length1 + length2)
|
|
gfxFloat mAdvanceWidth;
|
|
|
|
// For zero-width substrings, these must be zero!
|
|
gfxFloat mAscent; // always non-negative
|
|
gfxFloat mDescent; // always non-negative
|
|
|
|
// Bounding box that is guaranteed to include everything drawn.
|
|
// If a tight boundingBox was requested when these metrics were
|
|
// generated, this will tightly wrap the glyphs, otherwise it is
|
|
// "loose" and may be larger than the true bounding box.
|
|
// Coordinates are relative to the baseline left origin, so typically
|
|
// mBoundingBox.y == -mAscent
|
|
gfxRect mBoundingBox;
|
|
};
|
|
|
|
/**
|
|
* Draw a series of glyphs to aContext. The direction of aTextRun must
|
|
* be honoured.
|
|
* @param aStart the first character to draw
|
|
* @param aEnd draw characters up to here
|
|
* @param aPt the baseline origin; the left end of the baseline
|
|
* for LTR textruns, the right end for RTL textruns.
|
|
* On return, this will be updated to the other end of the baseline.
|
|
* In application units, really!
|
|
* @param aRunParams record with drawing parameters, see TextRunDrawParams.
|
|
* Particular fields of interest include
|
|
* .spacing spacing to insert before and after characters (for RTL
|
|
* glyphs, before-spacing is inserted to the right of characters). There
|
|
* are aEnd - aStart elements in this array, unless it's null to indicate
|
|
* that there is no spacing.
|
|
* .drawMode specifies whether the fill or stroke of the glyph should be
|
|
* drawn, or if it should be drawn into the current path
|
|
* .contextPaint information about how to construct the fill and
|
|
* stroke pattern. Can be nullptr if we are not stroking the text, which
|
|
* indicates that the current source from context should be used for fill
|
|
* .context the Thebes graphics context to which we're drawing
|
|
* .dt Moz2D DrawTarget to which we're drawing
|
|
*
|
|
* Callers guarantee:
|
|
* -- aStart and aEnd are aligned to cluster and ligature boundaries
|
|
* -- all glyphs use this font
|
|
*/
|
|
void Draw(const gfxTextRun* aTextRun, uint32_t aStart, uint32_t aEnd,
|
|
mozilla::gfx::Point* aPt, const TextRunDrawParams& aRunParams,
|
|
mozilla::gfx::ShapedTextFlags aOrientation);
|
|
|
|
/**
|
|
* Draw the emphasis marks for the given text run. Its prerequisite
|
|
* and output are similiar to the method Draw().
|
|
* @param aPt the baseline origin of the emphasis marks.
|
|
* @param aParams some drawing parameters, see EmphasisMarkDrawParams.
|
|
*/
|
|
void DrawEmphasisMarks(const gfxTextRun* aShapedText,
|
|
mozilla::gfx::Point* aPt, uint32_t aOffset,
|
|
uint32_t aCount,
|
|
const EmphasisMarkDrawParams& aParams);
|
|
|
|
/**
|
|
* Measure a run of characters. See gfxTextRun::Metrics.
|
|
* @param aTight if false, then return the union of the glyph extents
|
|
* with the font-box for the characters (the rectangle with x=0,width=
|
|
* the advance width for the character run,y=-(font ascent), and height=
|
|
* font ascent + font descent). Otherwise, we must return as tight as possible
|
|
* an approximation to the area actually painted by glyphs.
|
|
* @param aDrawTargetForTightBoundingBox when aTight is true, this must
|
|
* be non-null.
|
|
* @param aSpacing spacing to insert before and after glyphs. The bounding box
|
|
* need not include the spacing itself, but the spacing affects the glyph
|
|
* positions. null if there is no spacing.
|
|
*
|
|
* Callers guarantee:
|
|
* -- aStart and aEnd are aligned to cluster and ligature boundaries
|
|
* -- all glyphs use this font
|
|
*
|
|
* The default implementation just uses font metrics and aTextRun's
|
|
* advances, and assumes no characters fall outside the font box. In
|
|
* general this is insufficient, because that assumption is not always true.
|
|
*/
|
|
virtual RunMetrics Measure(const gfxTextRun* aTextRun, uint32_t aStart,
|
|
uint32_t aEnd, BoundingBoxType aBoundingBoxType,
|
|
DrawTarget* aDrawTargetForTightBoundingBox,
|
|
Spacing* aSpacing,
|
|
mozilla::gfx::ShapedTextFlags aOrientation);
|
|
/**
|
|
* Line breaks have been changed at the beginning and/or end of a substring
|
|
* of the text. Reshaping may be required; glyph updating is permitted.
|
|
* @return true if anything was changed, false otherwise
|
|
*/
|
|
bool NotifyLineBreaksChanged(gfxTextRun* aTextRun, uint32_t aStart,
|
|
uint32_t aLength) {
|
|
return false;
|
|
}
|
|
|
|
// Expiration tracking
|
|
nsExpirationState* GetExpirationState() { return &mExpirationState; }
|
|
|
|
// Get the glyphID of a space
|
|
virtual uint32_t GetSpaceGlyph() = 0;
|
|
|
|
gfxGlyphExtents* GetOrCreateGlyphExtents(int32_t aAppUnitsPerDevUnit);
|
|
|
|
void SetupGlyphExtents(DrawTarget* aDrawTarget, uint32_t aGlyphID,
|
|
bool aNeedTight, gfxGlyphExtents* aExtents);
|
|
|
|
virtual bool AllowSubpixelAA() { return true; }
|
|
|
|
bool IsSyntheticBold() const { return mApplySyntheticBold; }
|
|
|
|
float AngleForSyntheticOblique() const;
|
|
float SkewForSyntheticOblique() const;
|
|
|
|
// Amount by which synthetic bold "fattens" the glyphs:
|
|
// For size S up to a threshold size T, we use (0.25 + 3S / 4T),
|
|
// so that the result ranges from 0.25 to 1.0; thereafter,
|
|
// simply use (S / T).
|
|
gfxFloat GetSyntheticBoldOffset() {
|
|
gfxFloat size = GetAdjustedSize();
|
|
const gfxFloat threshold = 48.0;
|
|
return size < threshold ? (0.25 + 0.75 * size / threshold)
|
|
: (size / threshold);
|
|
}
|
|
|
|
gfxFontEntry* GetFontEntry() const { return mFontEntry.get(); }
|
|
bool HasCharacter(uint32_t ch) {
|
|
if (!mIsValid || (mUnicodeRangeMap && !mUnicodeRangeMap->test(ch))) {
|
|
return false;
|
|
}
|
|
return mFontEntry->HasCharacter(ch);
|
|
}
|
|
|
|
const gfxCharacterMap* GetUnicodeRangeMap() const {
|
|
return mUnicodeRangeMap.get();
|
|
}
|
|
|
|
void SetUnicodeRangeMap(gfxCharacterMap* aUnicodeRangeMap) {
|
|
mUnicodeRangeMap = aUnicodeRangeMap;
|
|
}
|
|
|
|
uint16_t GetUVSGlyph(uint32_t aCh, uint32_t aVS) {
|
|
if (!mIsValid) {
|
|
return 0;
|
|
}
|
|
return mFontEntry->GetUVSGlyph(aCh, aVS);
|
|
}
|
|
|
|
template <typename T>
|
|
bool InitFakeSmallCapsRun(DrawTarget* aDrawTarget, gfxTextRun* aTextRun,
|
|
const T* aText, uint32_t aOffset, uint32_t aLength,
|
|
FontMatchType aMatchType,
|
|
mozilla::gfx::ShapedTextFlags aOrientation,
|
|
Script aScript, bool aSyntheticLower,
|
|
bool aSyntheticUpper);
|
|
|
|
// call the (virtual) InitTextRun method to do glyph generation/shaping,
|
|
// limiting the length of text passed by processing the run in multiple
|
|
// segments if necessary
|
|
template <typename T>
|
|
bool SplitAndInitTextRun(DrawTarget* aDrawTarget, gfxTextRun* aTextRun,
|
|
const T* aString, uint32_t aRunStart,
|
|
uint32_t aRunLength, Script aRunScript,
|
|
mozilla::gfx::ShapedTextFlags aOrientation);
|
|
|
|
// Get a ShapedWord representing the given text (either 8- or 16-bit)
|
|
// for use in setting up a gfxTextRun.
|
|
template <typename T>
|
|
gfxShapedWord* GetShapedWord(DrawTarget* aDrawTarget, const T* aText,
|
|
uint32_t aLength, uint32_t aHash,
|
|
Script aRunScript, bool aVertical,
|
|
int32_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags,
|
|
RoundingFlags aRounding,
|
|
gfxTextPerfMetrics* aTextPerf);
|
|
|
|
// Ensure the ShapedWord cache is initialized. This MUST be called before
|
|
// any attempt to use GetShapedWord().
|
|
void InitWordCache() {
|
|
if (!mWordCache) {
|
|
mWordCache = mozilla::MakeUnique<nsTHashtable<CacheHashEntry>>();
|
|
}
|
|
}
|
|
|
|
// Called by the gfxFontCache timer to increment the age of all the words,
|
|
// so that they'll expire after a sufficient period of non-use
|
|
void AgeCachedWords();
|
|
|
|
// Discard all cached word records; called on memory-pressure notification.
|
|
void ClearCachedWords() {
|
|
if (mWordCache) {
|
|
mWordCache->Clear();
|
|
}
|
|
}
|
|
|
|
// Glyph rendering/geometry has changed, so invalidate data as necessary.
|
|
void NotifyGlyphsChanged();
|
|
|
|
virtual void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const;
|
|
virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
|
|
FontCacheSizes* aSizes) const;
|
|
|
|
typedef enum {
|
|
FONT_TYPE_DWRITE,
|
|
FONT_TYPE_GDI,
|
|
FONT_TYPE_FT2,
|
|
FONT_TYPE_MAC,
|
|
FONT_TYPE_OS2,
|
|
FONT_TYPE_CAIRO,
|
|
FONT_TYPE_FONTCONFIG
|
|
} FontType;
|
|
|
|
virtual FontType GetType() const = 0;
|
|
|
|
const RefPtr<mozilla::gfx::UnscaledFont>& GetUnscaledFont() const {
|
|
return mUnscaledFont;
|
|
}
|
|
|
|
virtual already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
|
|
DrawTarget* aTarget) = 0;
|
|
|
|
void InitializeScaledFont();
|
|
|
|
bool KerningDisabled() { return mKerningSet && !mKerningEnabled; }
|
|
|
|
/**
|
|
* Subclass this object to be notified of glyph changes. Delete the object
|
|
* when no longer needed.
|
|
*/
|
|
class GlyphChangeObserver {
|
|
public:
|
|
virtual ~GlyphChangeObserver() {
|
|
if (mFont) {
|
|
mFont->RemoveGlyphChangeObserver(this);
|
|
}
|
|
}
|
|
// This gets called when the gfxFont dies.
|
|
void ForgetFont() { mFont = nullptr; }
|
|
virtual void NotifyGlyphsChanged() = 0;
|
|
|
|
protected:
|
|
explicit GlyphChangeObserver(gfxFont* aFont) : mFont(aFont) {
|
|
mFont->AddGlyphChangeObserver(this);
|
|
}
|
|
// This pointer is nulled by ForgetFont in the gfxFont's
|
|
// destructor. Before the gfxFont dies.
|
|
gfxFont* MOZ_NON_OWNING_REF mFont;
|
|
};
|
|
friend class GlyphChangeObserver;
|
|
|
|
bool GlyphsMayChange() {
|
|
// Currently only fonts with SVG glyphs can have animated glyphs
|
|
return mFontEntry->TryGetSVGData(this);
|
|
}
|
|
|
|
static void DestroySingletons() {
|
|
delete sScriptTagToCode;
|
|
delete sDefaultFeatures;
|
|
}
|
|
|
|
// Call TryGetMathTable() to try and load the Open Type MATH table.
|
|
// If (and ONLY if) TryGetMathTable() has returned true, the MathTable()
|
|
// method may be called to access the gfxMathTable data.
|
|
bool TryGetMathTable();
|
|
gfxMathTable* MathTable() {
|
|
MOZ_RELEASE_ASSERT(mMathTable,
|
|
"A successful call to TryGetMathTable() must be "
|
|
"performed before calling this function");
|
|
return mMathTable.get();
|
|
}
|
|
|
|
// Return a cloned font resized and offset to simulate sub/superscript
|
|
// glyphs. This does not add a reference to the returned font.
|
|
gfxFont* GetSubSuperscriptFont(int32_t aAppUnitsPerDevPixel);
|
|
|
|
protected:
|
|
virtual const Metrics& GetHorizontalMetrics() = 0;
|
|
|
|
mozilla::UniquePtr<const Metrics> CreateVerticalMetrics();
|
|
|
|
// Template parameters for DrawGlyphs/DrawOneGlyph, used to select
|
|
// simplified versions of the methods in the most common cases.
|
|
enum class FontComplexityT { SimpleFont, ComplexFont };
|
|
enum class SpacingT { NoSpacing, HasSpacing };
|
|
|
|
// Output a run of glyphs at *aPt, which is updated to follow the last glyph
|
|
// in the run. This method also takes account of any letter-spacing provided
|
|
// in aRunParams.
|
|
template <FontComplexityT FC, SpacingT S>
|
|
bool DrawGlyphs(const gfxShapedText* aShapedText,
|
|
uint32_t aOffset, // offset in the textrun
|
|
uint32_t aCount, // length of run to draw
|
|
mozilla::gfx::Point* aPt,
|
|
// transform for mOffset field in DetailedGlyph records,
|
|
// to account for rotations (may be null)
|
|
const mozilla::gfx::Matrix* aOffsetMatrix,
|
|
GlyphBufferAzure& aBuffer);
|
|
|
|
// Output a single glyph at *aPt.
|
|
// Normal glyphs are simply accumulated in aBuffer until it is full and
|
|
// gets flushed, but SVG or color-font glyphs will instead be rendered
|
|
// directly to the destination (found from the buffer's parameters).
|
|
template <FontComplexityT FC>
|
|
void DrawOneGlyph(uint32_t aGlyphID, const mozilla::gfx::Point& aPt,
|
|
GlyphBufferAzure& aBuffer, bool* aEmittedGlyphs) const;
|
|
|
|
// Helper for DrawOneGlyph to handle missing glyphs, rendering either
|
|
// nothing (for default-ignorables) or a missing-glyph hexbox.
|
|
bool DrawMissingGlyph(const TextRunDrawParams& aRunParams,
|
|
const FontDrawParams& aFontParams,
|
|
const gfxShapedText::DetailedGlyph* aDetails,
|
|
const mozilla::gfx::Point& aPt);
|
|
|
|
// set the font size and offset used for
|
|
// synthetic subscript/superscript glyphs
|
|
void CalculateSubSuperSizeAndOffset(int32_t aAppUnitsPerDevPixel,
|
|
gfxFloat& aSubSuperSizeRatio,
|
|
float& aBaselineOffset);
|
|
|
|
// Return a font that is a "clone" of this one, but reduced to 80% size
|
|
// (and with variantCaps set to normal). This does not add a reference to
|
|
// the returned font.
|
|
gfxFont* GetSmallCapsFont();
|
|
|
|
// subclasses may provide (possibly hinted) glyph widths (in font units);
|
|
// if they do not override this, harfbuzz will use unhinted widths
|
|
// derived from the font tables
|
|
virtual bool ProvidesGlyphWidths() const { return false; }
|
|
|
|
// The return value is interpreted as a horizontal advance in 16.16 fixed
|
|
// point format.
|
|
virtual int32_t GetGlyphWidth(uint16_t aGID) { return -1; }
|
|
|
|
virtual bool GetGlyphBounds(uint16_t aGID, gfxRect* aBounds,
|
|
bool aTight = false) {
|
|
return false;
|
|
}
|
|
|
|
bool IsSpaceGlyphInvisible(DrawTarget* aRefDrawTarget,
|
|
const gfxTextRun* aTextRun);
|
|
|
|
void AddGlyphChangeObserver(GlyphChangeObserver* aObserver);
|
|
void RemoveGlyphChangeObserver(GlyphChangeObserver* aObserver);
|
|
|
|
// whether font contains substitution lookups containing spaces
|
|
bool HasSubstitutionRulesWithSpaceLookups(Script aRunScript);
|
|
|
|
// do spaces participate in shaping rules? if so, can't used word cache
|
|
bool SpaceMayParticipateInShaping(Script aRunScript);
|
|
|
|
// For 8-bit text, expand to 16-bit and then call the following method.
|
|
bool ShapeText(DrawTarget* aContext, const uint8_t* aText,
|
|
uint32_t aOffset, // dest offset in gfxShapedText
|
|
uint32_t aLength, Script aScript, bool aVertical,
|
|
RoundingFlags aRounding,
|
|
gfxShapedText* aShapedText); // where to store the result
|
|
|
|
// Call the appropriate shaper to generate glyphs for aText and store
|
|
// them into aShapedText.
|
|
virtual bool ShapeText(DrawTarget* aContext, const char16_t* aText,
|
|
uint32_t aOffset, uint32_t aLength, Script aScript,
|
|
bool aVertical, RoundingFlags aRounding,
|
|
gfxShapedText* aShapedText);
|
|
|
|
// Helper to adjust for synthetic bold and set character-type flags
|
|
// in the shaped text; implementations of ShapeText should call this
|
|
// after glyph shaping has been completed.
|
|
void PostShapingFixup(DrawTarget* aContext, const char16_t* aText,
|
|
uint32_t aOffset, // position within aShapedText
|
|
uint32_t aLength, bool aVertical,
|
|
gfxShapedText* aShapedText);
|
|
|
|
// Shape text directly into a range within a textrun, without using the
|
|
// font's word cache. Intended for use when the font has layout features
|
|
// that involve space, and therefore require shaping complete runs rather
|
|
// than isolated words, or for long strings that are inefficient to cache.
|
|
// This will split the text on "invalid" characters (tab/newline) that are
|
|
// not handled via normal shaping, but does not otherwise divide up the
|
|
// text.
|
|
template <typename T>
|
|
bool ShapeTextWithoutWordCache(DrawTarget* aDrawTarget, const T* aText,
|
|
uint32_t aOffset, uint32_t aLength,
|
|
Script aScript, bool aVertical,
|
|
RoundingFlags aRounding, gfxTextRun* aTextRun);
|
|
|
|
// Shape a fragment of text (a run that is known to contain only
|
|
// "valid" characters, no newlines/tabs/other control chars).
|
|
// All non-wordcache shaping goes through here; this is the function
|
|
// that will ensure we don't pass excessively long runs to the various
|
|
// platform shapers.
|
|
template <typename T>
|
|
bool ShapeFragmentWithoutWordCache(DrawTarget* aDrawTarget, const T* aText,
|
|
uint32_t aOffset, uint32_t aLength,
|
|
Script aScript, bool aVertical,
|
|
RoundingFlags aRounding,
|
|
gfxTextRun* aTextRun);
|
|
|
|
void CheckForFeaturesInvolvingSpace();
|
|
|
|
// whether a given feature is included in feature settings from both the
|
|
// font and the style. aFeatureOn set if resolved feature value is non-zero
|
|
bool HasFeatureSet(uint32_t aFeature, bool& aFeatureOn);
|
|
|
|
// used when analyzing whether a font has space contextual lookups
|
|
static nsDataHashtable<nsUint32HashKey, Script>* sScriptTagToCode;
|
|
static nsTHashtable<nsUint32HashKey>* sDefaultFeatures;
|
|
|
|
RefPtr<gfxFontEntry> mFontEntry;
|
|
|
|
struct CacheHashKey {
|
|
union {
|
|
const uint8_t* mSingle;
|
|
const char16_t* mDouble;
|
|
} mText;
|
|
uint32_t mLength;
|
|
mozilla::gfx::ShapedTextFlags mFlags;
|
|
Script mScript;
|
|
int32_t mAppUnitsPerDevUnit;
|
|
PLDHashNumber mHashKey;
|
|
bool mTextIs8Bit;
|
|
RoundingFlags mRounding;
|
|
|
|
CacheHashKey(const uint8_t* aText, uint32_t aLength, uint32_t aStringHash,
|
|
Script aScriptCode, int32_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags, RoundingFlags aRounding)
|
|
: mLength(aLength),
|
|
mFlags(aFlags),
|
|
mScript(aScriptCode),
|
|
mAppUnitsPerDevUnit(aAppUnitsPerDevUnit),
|
|
mHashKey(aStringHash + static_cast<int32_t>(aScriptCode) +
|
|
aAppUnitsPerDevUnit * 0x100 + uint16_t(aFlags) * 0x10000 +
|
|
int(aRounding)),
|
|
mTextIs8Bit(true),
|
|
mRounding(aRounding) {
|
|
NS_ASSERTION(aFlags & mozilla::gfx::ShapedTextFlags::TEXT_IS_8BIT,
|
|
"8-bit flag should have been set");
|
|
mText.mSingle = aText;
|
|
}
|
|
|
|
CacheHashKey(const char16_t* aText, uint32_t aLength, uint32_t aStringHash,
|
|
Script aScriptCode, int32_t aAppUnitsPerDevUnit,
|
|
mozilla::gfx::ShapedTextFlags aFlags, RoundingFlags aRounding)
|
|
: mLength(aLength),
|
|
mFlags(aFlags),
|
|
mScript(aScriptCode),
|
|
mAppUnitsPerDevUnit(aAppUnitsPerDevUnit),
|
|
mHashKey(aStringHash + static_cast<int32_t>(aScriptCode) +
|
|
aAppUnitsPerDevUnit * 0x100 + uint16_t(aFlags) * 0x10000 +
|
|
int(aRounding)),
|
|
mTextIs8Bit(false),
|
|
mRounding(aRounding) {
|
|
// We can NOT assert that TEXT_IS_8BIT is false in aFlags here,
|
|
// because this might be an 8bit-only word from a 16-bit textrun,
|
|
// in which case the text we're passed is still in 16-bit form,
|
|
// and we'll have to use an 8-to-16bit comparison in KeyEquals.
|
|
mText.mDouble = aText;
|
|
}
|
|
};
|
|
|
|
class CacheHashEntry : public PLDHashEntryHdr {
|
|
public:
|
|
typedef const CacheHashKey& KeyType;
|
|
typedef const CacheHashKey* KeyTypePointer;
|
|
|
|
// When constructing a new entry in the hashtable, the caller of Put()
|
|
// will fill us in.
|
|
explicit CacheHashEntry(KeyTypePointer aKey) {}
|
|
CacheHashEntry(const CacheHashEntry& toCopy) {
|
|
NS_ERROR("Should not be called");
|
|
}
|
|
~CacheHashEntry() {}
|
|
|
|
bool KeyEquals(const KeyTypePointer aKey) const;
|
|
|
|
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
|
|
|
|
static PLDHashNumber HashKey(const KeyTypePointer aKey) {
|
|
return aKey->mHashKey;
|
|
}
|
|
|
|
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
|
|
return aMallocSizeOf(mShapedWord.get());
|
|
}
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
|
|
mozilla::UniquePtr<gfxShapedWord> mShapedWord;
|
|
};
|
|
|
|
mozilla::UniquePtr<nsTHashtable<CacheHashEntry>> mWordCache;
|
|
|
|
static const uint32_t kShapedWordCacheMaxAge = 3;
|
|
|
|
nsTArray<mozilla::UniquePtr<gfxGlyphExtents>> mGlyphExtentsArray;
|
|
mozilla::UniquePtr<nsTHashtable<nsPtrHashKey<GlyphChangeObserver>>>
|
|
mGlyphChangeObservers;
|
|
|
|
// a copy of the font without antialiasing, if needed for separate
|
|
// measurement by mathml code
|
|
mozilla::UniquePtr<gfxFont> mNonAAFont;
|
|
|
|
// we create either or both of these shapers when needed, depending
|
|
// whether the font has graphite tables, and whether graphite shaping
|
|
// is actually enabled
|
|
mozilla::UniquePtr<gfxFontShaper> mHarfBuzzShaper;
|
|
mozilla::UniquePtr<gfxFontShaper> mGraphiteShaper;
|
|
|
|
// if a userfont with unicode-range specified, contains map of *possible*
|
|
// ranges supported by font
|
|
RefPtr<gfxCharacterMap> mUnicodeRangeMap;
|
|
|
|
RefPtr<mozilla::gfx::UnscaledFont> mUnscaledFont;
|
|
RefPtr<mozilla::gfx::ScaledFont> mAzureScaledFont;
|
|
|
|
// For vertical metrics, created on demand.
|
|
mozilla::UniquePtr<const Metrics> mVerticalMetrics;
|
|
|
|
// Table used for MathML layout.
|
|
mozilla::UniquePtr<gfxMathTable> mMathTable;
|
|
|
|
gfxFontStyle mStyle;
|
|
gfxFloat mAdjustedSize;
|
|
|
|
// Conversion factor from font units to dev units; note that this may be
|
|
// zero (in the degenerate case where mAdjustedSize has become zero).
|
|
// This is OK because we only multiply by this factor, never divide.
|
|
float mFUnitsConvFactor;
|
|
|
|
nsExpirationState mExpirationState;
|
|
|
|
// the AA setting requested for this font - may affect glyph bounds
|
|
AntialiasOption mAntialiasOption;
|
|
|
|
bool mIsValid;
|
|
|
|
// use synthetic bolding for environments where this is not supported
|
|
// by the platform
|
|
bool mApplySyntheticBold;
|
|
|
|
bool mKerningSet; // kerning explicitly set?
|
|
bool mKerningEnabled; // if set, on or off?
|
|
|
|
bool mMathInitialized; // TryGetMathTable() called?
|
|
|
|
// Helper for subclasses that want to initialize standard metrics from the
|
|
// tables of sfnt (TrueType/OpenType) fonts.
|
|
// This will use mFUnitsConvFactor if it is already set, else compute it
|
|
// from mAdjustedSize and the unitsPerEm in the font's 'head' table.
|
|
// Returns TRUE and sets mIsValid=TRUE if successful;
|
|
// Returns TRUE but leaves mIsValid=FALSE if the font seems to be broken.
|
|
// Returns FALSE if the font does not appear to be an sfnt at all,
|
|
// and should be handled (if possible) using other APIs.
|
|
bool InitMetricsFromSfntTables(Metrics& aMetrics);
|
|
|
|
// Helper to calculate various derived metrics from the results of
|
|
// InitMetricsFromSfntTables or equivalent platform code
|
|
void CalculateDerivedMetrics(Metrics& aMetrics);
|
|
|
|
// some fonts have bad metrics, this method sanitize them.
|
|
// if this font has bad underline offset, aIsBadUnderlineFont should be true.
|
|
void SanitizeMetrics(Metrics* aMetrics, bool aIsBadUnderlineFont);
|
|
|
|
bool RenderSVGGlyph(gfxContext* aContext,
|
|
mozilla::layout::TextDrawTarget* aTextDrawer,
|
|
mozilla::gfx::Point aPoint, uint32_t aGlyphId,
|
|
SVGContextPaint* aContextPaint) const;
|
|
bool RenderSVGGlyph(gfxContext* aContext,
|
|
mozilla::layout::TextDrawTarget* aTextDrawer,
|
|
mozilla::gfx::Point aPoint, uint32_t aGlyphId,
|
|
SVGContextPaint* aContextPaint,
|
|
gfxTextRunDrawCallbacks* aCallbacks,
|
|
bool& aEmittedGlyphs) const;
|
|
|
|
bool RenderColorGlyph(DrawTarget* aDrawTarget, gfxContext* aContext,
|
|
mozilla::layout::TextDrawTarget* aTextDrawer,
|
|
mozilla::gfx::ScaledFont* scaledFont,
|
|
mozilla::gfx::DrawOptions drawOptions,
|
|
const mozilla::gfx::Point& aPoint,
|
|
uint32_t aGlyphId) const;
|
|
|
|
// Bug 674909. When synthetic bolding text by drawing twice, need to
|
|
// render using a pixel offset in device pixels, otherwise text
|
|
// doesn't appear bolded, it appears as if a bad text shadow exists
|
|
// when a non-identity transform exists. Use an offset factor so that
|
|
// the second draw occurs at a constant offset in device pixels.
|
|
// This helper calculates the scale factor we need to apply to the
|
|
// synthetic-bold offset.
|
|
static mozilla::gfx::Float CalcXScale(DrawTarget* aDrawTarget);
|
|
};
|
|
|
|
// proportion of ascent used for x-height, if unable to read value from font
|
|
#define DEFAULT_XHEIGHT_FACTOR 0.56f
|
|
|
|
// Parameters passed to gfxFont methods for drawing glyphs from a textrun.
|
|
// The TextRunDrawParams are set up once per textrun; the FontDrawParams
|
|
// are dependent on the specific font, so they are set per GlyphRun.
|
|
|
|
struct MOZ_STACK_CLASS TextRunDrawParams {
|
|
RefPtr<mozilla::gfx::DrawTarget> dt;
|
|
gfxContext* context;
|
|
gfxFont::Spacing* spacing;
|
|
gfxTextRunDrawCallbacks* callbacks;
|
|
mozilla::SVGContextPaint* runContextPaint;
|
|
mozilla::gfx::Float direction;
|
|
double devPerApp;
|
|
nscolor textStrokeColor;
|
|
gfxPattern* textStrokePattern;
|
|
const mozilla::gfx::StrokeOptions* strokeOpts;
|
|
const mozilla::gfx::DrawOptions* drawOpts;
|
|
DrawMode drawMode;
|
|
bool isVerticalRun;
|
|
bool isRTL;
|
|
bool paintSVGGlyphs;
|
|
};
|
|
|
|
struct MOZ_STACK_CLASS FontDrawParams {
|
|
RefPtr<mozilla::gfx::ScaledFont> scaledFont;
|
|
mozilla::SVGContextPaint* contextPaint;
|
|
mozilla::gfx::Float synBoldOnePixelOffset;
|
|
mozilla::gfx::Float obliqueSkew;
|
|
int32_t extraStrikes;
|
|
mozilla::gfx::DrawOptions drawOptions;
|
|
gfxFloat advanceDirection;
|
|
bool isVerticalFont;
|
|
bool haveSVGGlyphs;
|
|
bool haveColorGlyphs;
|
|
};
|
|
|
|
struct MOZ_STACK_CLASS EmphasisMarkDrawParams {
|
|
gfxContext* context;
|
|
gfxFont::Spacing* spacing;
|
|
gfxTextRun* mark;
|
|
gfxFloat advance;
|
|
gfxFloat direction;
|
|
bool isVertical;
|
|
};
|
|
|
|
#endif
|