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Diffstat (limited to 'app/assets/javascripts/emoji/support/unicode_support_map.js')
| -rw-r--r-- | app/assets/javascripts/emoji/support/unicode_support_map.js | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/app/assets/javascripts/emoji/support/unicode_support_map.js b/app/assets/javascripts/emoji/support/unicode_support_map.js new file mode 100644 index 00000000000..755381c2f95 --- /dev/null +++ b/app/assets/javascripts/emoji/support/unicode_support_map.js @@ -0,0 +1,167 @@ +import AccessorUtilities from '../../lib/utils/accessor'; + +const unicodeSupportTestMap = { + // man, student (emojione does not have any of these yet), http://emojipedia.org/emoji-zwj-sequences/ + // occupationZwj: '\u{1F468}\u{200D}\u{1F393}', + // woman, biking (emojione does not have any of these yet), http://emojipedia.org/emoji-zwj-sequences/ + // sexZwj: '\u{1F6B4}\u{200D}\u{2640}', + // family_mwgb + // Windows 8.1, Firefox 51.0.1 does not support `family_`, `kiss_`, `couple_` + personZwj: '\u{1F468}\u{200D}\u{1F469}\u{200D}\u{1F467}\u{200D}\u{1F466}', + // horse_racing_tone5 + // Special case that is not supported on macOS 10.12 even though `skinToneModifier` succeeds + horseRacing: '\u{1F3C7}\u{1F3FF}', + // US flag, http://emojipedia.org/flags/ + flag: '\u{1F1FA}\u{1F1F8}', + // http://emojipedia.org/modifiers/ + skinToneModifier: [ + // spy_tone5 + '\u{1F575}\u{1F3FF}', + // person_with_ball_tone5 + '\u{26F9}\u{1F3FF}', + // angel_tone5 + '\u{1F47C}\u{1F3FF}', + ], + // rofl, http://emojipedia.org/unicode-9.0/ + '9.0': '\u{1F923}', + // metal, http://emojipedia.org/unicode-8.0/ + '8.0': '\u{1F918}', + // spy, http://emojipedia.org/unicode-7.0/ + '7.0': '\u{1F575}', + // expressionless, http://emojipedia.org/unicode-6.1/ + 6.1: '\u{1F611}', + // japanese_goblin, http://emojipedia.org/unicode-6.0/ + '6.0': '\u{1F47A}', + // sailboat, http://emojipedia.org/unicode-5.2/ + 5.2: '\u{26F5}', + // mahjong, http://emojipedia.org/unicode-5.1/ + 5.1: '\u{1F004}', + // gear, http://emojipedia.org/unicode-4.1/ + 4.1: '\u{2699}', + // zap, http://emojipedia.org/unicode-4.0/ + '4.0': '\u{26A1}', + // recycle, http://emojipedia.org/unicode-3.2/ + 3.2: '\u{267B}', + // information_source, http://emojipedia.org/unicode-3.0/ + '3.0': '\u{2139}', + // heart, http://emojipedia.org/unicode-1.1/ + 1.1: '\u{2764}', +}; + +function checkPixelInImageDataArray(pixelOffset, imageDataArray) { + // `4 *` because RGBA + const indexOffset = 4 * pixelOffset; + const hasColor = imageDataArray[indexOffset + 0] || + imageDataArray[indexOffset + 1] || + imageDataArray[indexOffset + 2]; + const isVisible = imageDataArray[indexOffset + 3]; + // Check for some sort of color other than black + if (hasColor && isVisible) { + return true; + } + return false; +} + +const chromeMatches = navigator.userAgent.match(/Chrom(?:e|ium)\/([0-9]+)\./); +const isChrome = chromeMatches && chromeMatches.length > 0; +const chromeVersion = chromeMatches && chromeMatches[1] && parseInt(chromeMatches[1], 10); + +// We use 16px because mobile Safari (iOS 9.3) doesn't properly scale emojis :/ +// See 32px, https://i.imgur.com/htY6Zym.png +// See 16px, https://i.imgur.com/FPPsIF8.png +const fontSize = 16; +function generateUnicodeSupportMap(testMap) { + const testMapKeys = Object.keys(testMap); + const numTestEntries = testMapKeys + .reduce((list, testKey) => list.concat(testMap[testKey]), []).length; + + const canvas = document.createElement('canvas'); + (window.gl || window).testEmojiUnicodeSupportMapCanvas = canvas; + const ctx = canvas.getContext('2d'); + canvas.width = (2 * fontSize); + canvas.height = (numTestEntries * fontSize); + ctx.fillStyle = '#000000'; + ctx.textBaseline = 'middle'; + ctx.font = `${fontSize}px "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"`; + // Write each emoji to the canvas vertically + let writeIndex = 0; + testMapKeys.forEach((testKey) => { + const testEntry = testMap[testKey]; + [].concat(testEntry).forEach((emojiUnicode) => { + ctx.fillText(emojiUnicode, 0, (writeIndex * fontSize) + (fontSize / 2)); + writeIndex += 1; + }); + }); + + // Read from the canvas + const resultMap = {}; + let readIndex = 0; + testMapKeys.forEach((testKey) => { + const testEntry = testMap[testKey]; + // This needs to be a `reduce` instead of `every` because we need to + // keep the `readIndex` in sync from the writes by running all entries + const isTestSatisfied = [].concat(testEntry).reduce((isSatisfied) => { + // Sample along the vertical-middle for a couple of characters + const imageData = ctx.getImageData( + 0, + (readIndex * fontSize) + (fontSize / 2), + 2 * fontSize, + 1, + ).data; + + let isValidEmoji = false; + for (let currentPixel = 0; currentPixel < 64; currentPixel += 1) { + const isLookingAtFirstChar = currentPixel < fontSize; + const isLookingAtSecondChar = currentPixel >= (fontSize + (fontSize / 2)); + // Check for the emoji somewhere along the row + if (isLookingAtFirstChar && checkPixelInImageDataArray(currentPixel, imageData)) { + isValidEmoji = true; + + // Check to see that nothing is rendered next to the first character + // to ensure that the ZWJ sequence rendered as one piece + } else if (isLookingAtSecondChar && checkPixelInImageDataArray(currentPixel, imageData)) { + isValidEmoji = false; + break; + } + } + + readIndex += 1; + return isSatisfied && isValidEmoji; + }, true); + + resultMap[testKey] = isTestSatisfied; + }); + + resultMap.meta = { + isChrome, + chromeVersion, + }; + + return resultMap; +} + +export default function getUnicodeSupportMap() { + let unicodeSupportMap; + let userAgentFromCache; + + const isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe(); + + if (isLocalStorageAvailable) userAgentFromCache = window.localStorage.getItem('gl-emoji-user-agent'); + + try { + unicodeSupportMap = JSON.parse(window.localStorage.getItem('gl-emoji-unicode-support-map')); + } catch (err) { + // swallow + } + + if (!unicodeSupportMap || userAgentFromCache !== navigator.userAgent) { + unicodeSupportMap = generateUnicodeSupportMap(unicodeSupportTestMap); + + if (isLocalStorageAvailable) { + window.localStorage.setItem('gl-emoji-user-agent', navigator.userAgent); + window.localStorage.setItem('gl-emoji-unicode-support-map', JSON.stringify(unicodeSupportMap)); + } + } + + return unicodeSupportMap; +} |