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Fix font fallback Safari 10 for iOS #402

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Fix font fallback Safari 10 for iOS #402

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8972026
Added mock font measuring for Safari 10 with fallback bug
dengjeffrey May 7, 2018
cb19ba4
Added iOS safari 10 match
dengjeffrey May 7, 2018
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7 changes: 5 additions & 2 deletions src/core/fontwatcher.js
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -57,11 +57,14 @@ goog.scope(function () {
if (FontWatcher.SHOULD_USE_NATIVE_LOADER === null) {
if (!!window.FontFace) {
var match = /Gecko.*Firefox\/(\d+)/.exec(FontWatcher.getUserAgent());
var safari10Match = /OS X.*Version\/10\..*Safari/.exec(FontWatcher.getUserAgent()) && /Apple/.exec(FontWatcher.getVendor());
var appleMatch = /Apple/.exec(FontWatcher.getVendor())
var safari10Match = /OS X.*Version\/10\..*Safari/.exec(FontWatcher.getUserAgent()) ||
/AppleWebKit\/603/.exec(FontWatcher.getUserAgent()) ||
/AppleWebKit\/602/.exec(FontWatcher.getUserAgent())

if (match) {
FontWatcher.SHOULD_USE_NATIVE_LOADER = parseInt(match[1], 10) > 42;
} else if (safari10Match) {
} else if (appleMatch && safari10Match) {
FontWatcher.SHOULD_USE_NATIVE_LOADER = false;
} else {
FontWatcher.SHOULD_USE_NATIVE_LOADER = true;
Expand Down
42 changes: 39 additions & 3 deletions src/core/fontwatchrunner.js
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,8 @@ webfont.FontWatchRunner = function(activeCallback, inactiveCallback, domHelper,
*/
webfont.FontWatchRunner.LastResortFonts = {
SERIF: 'serif',
SANS_SERIF: 'sans-serif'
SANS_SERIF: 'sans-serif',
MOCK_FONT: 'FontWatchRunnerMockFont'
};

/**
Expand Down Expand Up @@ -70,7 +71,7 @@ goog.scope(function () {

/**
* Returns true if this browser is WebKit and it has the fallback bug
* which is present in WebKit 536.11 and earlier.
* which is present in WebKit 602.*, 603.* ,and 536.11 and earlier
*
* @return {boolean}
*/
Expand All @@ -81,7 +82,9 @@ goog.scope(function () {
FontWatchRunner.HAS_WEBKIT_FALLBACK_BUG = !!match &&
(parseInt(match[1], 10) < 536 ||
(parseInt(match[1], 10) === 536 &&
parseInt(match[2], 10) <= 11));
parseInt(match[2], 10) <= 11) ||
parseInt(match[1], 10) === 602 ||
parseInt(match[1], 10) === 603);
}
return FontWatchRunner.HAS_WEBKIT_FALLBACK_BUG;
};
Expand Down Expand Up @@ -110,6 +113,10 @@ goog.scope(function () {
this.lastResortWidths_[FontWatchRunner.LastResortFonts.SERIF] = this.lastResortRulerA_.getWidth();
this.lastResortWidths_[FontWatchRunner.LastResortFonts.SANS_SERIF] = this.lastResortRulerB_.getWidth();

if (FontWatchRunner.hasWebKitFallbackBug()) {
this.lastResortWidths_[FontWatchRunner.LastResortFonts.MOCK_FONT] = this.getMockFontWidth_();
}

this.started_ = goog.now();

this.check_();
Expand Down Expand Up @@ -193,6 +200,35 @@ goog.scope(function () {
return this.metricCompatibleFonts_ === null || this.metricCompatibleFonts_.hasOwnProperty(this.font_.getName());
};


/**
* Calculates the width of a mock font with the current font's variation css style
* before it has finished loading.
*
* @private
* @return {number}
*/
FontWatchRunner.prototype.getMockFontWidth_ = function () {

var mockFontStyle = "@font-face\{font-family: '" + FontWatchRunner.LastResortFonts.MOCK_FONT + "';" +
this.font_.getCssVariation() +
"src: url(some.woff2) format('woff2');\}"

var mockFontCss = this.domHelper_.createStyle(mockFontStyle);
this.domHelper_.insertInto('head', mockFontCss)

var mockFontRuler = new FontRuler(this.domHelper_, this.fontTestString_);
mockFontRuler.setFont(new Font(FontWatchRunner.LastResortFonts.MOCK_FONT, this.font_.getVariation()));
mockFontRuler.insert();

var mockFontWidth = mockFontRuler.getWidth();

mockFontRuler.remove()
this.domHelper_.removeElement(mockFontCss)

return mockFontWidth
}

/**
* Checks the width of the two spans against their original widths during each
* async loop. If the width of one of the spans is different than the original
Expand Down