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* @module ol/render/canvas\n */\nimport BaseObject from '../Object.js';\nimport EventTarget from '../events/Target.js';\nimport { WORKER_OFFSCREEN_CANVAS } from '../has.js';\nimport { clear } from '../obj.js';\nimport { createCanvasContext2D } from '../dom.js';\nimport { getFontParameters } from '../css.js';\n/**\n * @typedef {'Circle' | 'Image' | 'LineString' | 'Polygon' | 'Text' | 'Default'} BuilderType\n */\n/**\n * @typedef {Object} FillState\n * @property {import(\"../colorlike.js\").ColorLike} fillStyle FillStyle.\n */\n/**\n * @typedef Label\n * @property {number} width Width.\n * @property {number} height Height.\n * @property {Array<string|number>} contextInstructions ContextInstructions.\n */\n/**\n * @typedef {Object} FillStrokeState\n * @property {import(\"../colorlike.js\").ColorLike} [currentFillStyle] Current FillStyle.\n * @property {import(\"../colorlike.js\").ColorLike} [currentStrokeStyle] Current StrokeStyle.\n * @property {CanvasLineCap} [currentLineCap] Current LineCap.\n * @property {Array<number>} currentLineDash Current LineDash.\n * @property {number} [currentLineDashOffset] Current LineDashOffset.\n * @property {CanvasLineJoin} [currentLineJoin] Current LineJoin.\n * @property {number} [currentLineWidth] Current LineWidth.\n * @property {number} [currentMiterLimit] Current MiterLimit.\n * @property {number} [lastStroke] Last stroke.\n * @property {import(\"../colorlike.js\").ColorLike} [fillStyle] FillStyle.\n * @property {import(\"../colorlike.js\").ColorLike} [strokeStyle] StrokeStyle.\n * @property {CanvasLineCap} [lineCap] LineCap.\n * @property {Array<number>} lineDash LineDash.\n * @property {number} [lineDashOffset] LineDashOffset.\n * @property {CanvasLineJoin} [lineJoin] LineJoin.\n * @property {number} [lineWidth] LineWidth.\n * @property {number} [miterLimit] MiterLimit.\n */\n/**\n * @typedef {Object} StrokeState\n * @property {CanvasLineCap} lineCap LineCap.\n * @property {Array<number>} lineDash LineDash.\n * @property {number} lineDashOffset LineDashOffset.\n * @property {CanvasLineJoin} lineJoin LineJoin.\n * @property {number} lineWidth LineWidth.\n * @property {number} miterLimit MiterLimit.\n * @property {import(\"../colorlike.js\").ColorLike} strokeStyle StrokeStyle.\n */\n/**\n * @typedef {Object} TextState\n * @property {string} font Font.\n * @property {string} [textAlign] TextAlign.\n * @property {string} [justify] Justify.\n * @property {string} textBaseline TextBaseline.\n * @property {string} [placement] Placement.\n * @property {number} [maxAngle] MaxAngle.\n * @property {boolean} [overflow] Overflow.\n * @property {import(\"../style/Fill.js\").default} [backgroundFill] BackgroundFill.\n * @property {import(\"../style/Stroke.js\").default} [backgroundStroke] BackgroundStroke.\n * @property {import(\"../size.js\").Size} [scale] Scale.\n * @property {Array<number>} [padding] Padding.\n */\n/**\n * @typedef {Object} SerializableInstructions\n * @property {Array<*>} instructions The rendering instructions.\n * @property {Array<*>} hitDetectionInstructions The rendering hit detection instructions.\n * @property {Array<number>} coordinates The array of all coordinates.\n * @property {!Object<string, TextState>} [textStates] The text states (decluttering).\n * @property {!Object<string, FillState>} [fillStates] The fill states (decluttering).\n * @property {!Object<string, StrokeState>} [strokeStates] The stroke states (decluttering).\n */\n/**\n * @typedef {Object<number, import(\"./canvas/Executor.js\").ReplayImageOrLabelArgs>} DeclutterImageWithText\n */\n/**\n * @const\n * @type {string}\n */\nexport var defaultFont = '10px sans-serif';\n/**\n * @const\n * @type {import(\"../colorlike.js\").ColorLike}\n */\nexport var defaultFillStyle = '#000';\n/**\n * @const\n * @type {CanvasLineCap}\n */\nexport var defaultLineCap = 'round';\n/**\n * @const\n * @type {Array<number>}\n */\nexport var defaultLineDash = [];\n/**\n * @const\n * @type {number}\n */\nexport var defaultLineDashOffset = 0;\n/**\n * @const\n * @type {CanvasLineJoin}\n */\nexport var defaultLineJoin = 'round';\n/**\n * @const\n * @type {number}\n */\nexport var defaultMiterLimit = 10;\n/**\n * @const\n * @type {import(\"../colorlike.js\").ColorLike}\n */\nexport var defaultStrokeStyle = '#000';\n/**\n * @const\n * @type {string}\n */\nexport var defaultTextAlign = 'center';\n/**\n * @const\n * @type {string}\n */\nexport var defaultTextBaseline = 'middle';\n/**\n * @const\n * @type {Array<number>}\n */\nexport var defaultPadding = [0, 0, 0, 0];\n/**\n * @const\n * @type {number}\n */\nexport var defaultLineWidth = 1;\n/**\n * @type {BaseObject}\n */\nexport var checkedFonts = new BaseObject();\n/**\n * The label cache for text rendering. To change the default cache size of 2048\n * entries, use {@link module:ol/structs/LRUCache~LRUCache#setSize cache.setSize()}.\n * Deprecated - there is no label cache any more.\n * @type {?}\n * @api\n * @deprecated\n */\nexport var labelCache = new EventTarget();\nlabelCache.setSize = function () {\n    console.warn('labelCache is deprecated.'); //eslint-disable-line\n};\n/**\n * @type {CanvasRenderingContext2D}\n */\nvar measureContext = null;\n/**\n * @type {string}\n */\nvar measureFont;\n/**\n * @type {!Object<string, number>}\n */\nexport var textHeights = {};\n/**\n * Clears the label cache when a font becomes available.\n * @param {string} fontSpec CSS font spec.\n */\nexport var registerFont = (function () {\n    var retries = 100;\n    var size = '32px ';\n    var referenceFonts = ['monospace', 'serif'];\n    var len = referenceFonts.length;\n    var text = 'wmytzilWMYTZIL@#/&?$%10\\uF013';\n    var interval, referenceWidth;\n    /**\n     * @param {string} fontStyle Css font-style\n     * @param {string} fontWeight Css font-weight\n     * @param {*} fontFamily Css font-family\n     * @return {boolean} Font with style and weight is available\n     */\n    function isAvailable(fontStyle, fontWeight, fontFamily) {\n        var available = true;\n        for (var i = 0; i < len; ++i) {\n            var referenceFont = referenceFonts[i];\n            referenceWidth = measureTextWidth(fontStyle + ' ' + fontWeight + ' ' + size + referenceFont, text);\n            if (fontFamily != referenceFont) {\n                var width = measureTextWidth(fontStyle +\n                    ' ' +\n                    fontWeight +\n                    ' ' +\n                    size +\n                    fontFamily +\n                    ',' +\n                    referenceFont, text);\n                // If width and referenceWidth are the same, then the fallback was used\n                // instead of the font we wanted, so the font is not available.\n                available = available && width != referenceWidth;\n            }\n        }\n        if (available) {\n            return true;\n        }\n        return false;\n    }\n    function check() {\n        var done = true;\n        var fonts = checkedFonts.getKeys();\n        for (var i = 0, ii = fonts.length; i < ii; ++i) {\n            var font = fonts[i];\n            if (checkedFonts.get(font) < retries) {\n                if (isAvailable.apply(this, font.split('\\n'))) {\n                    clear(textHeights);\n                    // Make sure that loaded fonts are picked up by Safari\n                    measureContext = null;\n                    measureFont = undefined;\n                    checkedFonts.set(font, retries);\n                }\n                else {\n                    checkedFonts.set(font, checkedFonts.get(font) + 1, true);\n                    done = false;\n                }\n            }\n        }\n        if (done) {\n            clearInterval(interval);\n            interval = undefined;\n        }\n    }\n    return function (fontSpec) {\n        var font = getFontParameters(fontSpec);\n        if (!font) {\n            return;\n        }\n        var families = font.families;\n        for (var i = 0, ii = families.length; i < ii; ++i) {\n            var family = families[i];\n            var key = font.style + '\\n' + font.weight + '\\n' + family;\n            if (checkedFonts.get(key) === undefined) {\n                checkedFonts.set(key, retries, true);\n                if (!isAvailable(font.style, font.weight, family)) {\n                    checkedFonts.set(key, 0, true);\n                    if (interval === undefined) {\n                        interval = setInterval(check, 32);\n                    }\n                }\n            }\n        }\n    };\n})();\n/**\n * @param {string} font Font to use for measuring.\n * @return {import(\"../size.js\").Size} Measurement.\n */\nexport var measureTextHeight = (function () {\n    /**\n     * @type {HTMLDivElement}\n     */\n    var measureElement;\n    return function (fontSpec) {\n        var height = textHeights[fontSpec];\n        if (height == undefined) {\n            if (WORKER_OFFSCREEN_CANVAS) {\n                var font = getFontParameters(fontSpec);\n                var metrics = measureText(fontSpec, 'Žg');\n                var lineHeight = isNaN(Number(font.lineHeight))\n                    ? 1.2\n                    : Number(font.lineHeight);\n                height =\n                    lineHeight *\n                        (metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent);\n            }\n            else {\n                if (!measureElement) {\n                    measureElement = document.createElement('div');\n                    measureElement.innerHTML = 'M';\n                    measureElement.style.minHeight = '0';\n                    measureElement.style.maxHeight = 'none';\n                    measureElement.style.height = 'auto';\n                    measureElement.style.padding = '0';\n                    measureElement.style.border = 'none';\n                    measureElement.style.position = 'absolute';\n                    measureElement.style.display = 'block';\n                    measureElement.style.left = '-99999px';\n                }\n                measureElement.style.font = fontSpec;\n                document.body.appendChild(measureElement);\n                height = measureElement.offsetHeight;\n                document.body.removeChild(measureElement);\n            }\n            textHeights[fontSpec] = height;\n        }\n        return height;\n    };\n})();\n/**\n * @param {string} font Font.\n * @param {string} text Text.\n * @return {TextMetrics} Text metrics.\n */\nfunction measureText(font, text) {\n    if (!measureContext) {\n        measureContext = createCanvasContext2D(1, 1);\n    }\n    if (font != measureFont) {\n        measureContext.font = font;\n        measureFont = measureContext.font;\n    }\n    return measureContext.measureText(text);\n}\n/**\n * @param {string} font Font.\n * @param {string} text Text.\n * @return {number} Width.\n */\nexport function measureTextWidth(font, text) {\n    return measureText(font, text).width;\n}\n/**\n * Measure text width using a cache.\n * @param {string} font The font.\n * @param {string} text The text to measure.\n * @param {Object<string, number>} cache A lookup of cached widths by text.\n * @return {number} The text width.\n */\nexport function measureAndCacheTextWidth(font, text, cache) {\n    if (text in cache) {\n        return cache[text];\n    }\n    var width = text\n        .split('\\n')\n        .reduce(function (prev, curr) { return Math.max(prev, measureTextWidth(font, curr)); }, 0);\n    cache[text] = width;\n    return width;\n}\n/**\n * @param {TextState} baseStyle Base style.\n * @param {Array<string>} chunks Text chunks to measure.\n * @return {{width: number, height: number, widths: Array<number>, heights: Array<number>, lineWidths: Array<number>}}} Text metrics.\n */\nexport function getTextDimensions(baseStyle, chunks) {\n    var widths = [];\n    var heights = [];\n    var lineWidths = [];\n    var width = 0;\n    var lineWidth = 0;\n    var height = 0;\n    var lineHeight = 0;\n    for (var i = 0, ii = chunks.length; i <= ii; i += 2) {\n        var text = chunks[i];\n        if (text === '\\n' || i === ii) {\n            width = Math.max(width, lineWidth);\n            lineWidths.push(lineWidth);\n            lineWidth = 0;\n            height += lineHeight;\n            continue;\n        }\n        var font = chunks[i + 1] || baseStyle.font;\n        var currentWidth = measureTextWidth(font, text);\n        widths.push(currentWidth);\n        lineWidth += currentWidth;\n        var currentHeight = measureTextHeight(font);\n        heights.push(currentHeight);\n        lineHeight = Math.max(lineHeight, currentHeight);\n    }\n    return { width: width, height: height, widths: widths, heights: heights, lineWidths: lineWidths };\n}\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {number} rotation Rotation.\n * @param {number} offsetX X offset.\n * @param {number} offsetY Y offset.\n */\nexport function rotateAtOffset(context, rotation, offsetX, offsetY) {\n    if (rotation !== 0) {\n        context.translate(offsetX, offsetY);\n        context.rotate(rotation);\n        context.translate(-offsetX, -offsetY);\n    }\n}\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {import(\"../transform.js\").Transform|null} transform Transform.\n * @param {number} opacity Opacity.\n * @param {Label|HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} labelOrImage Label.\n * @param {number} originX Origin X.\n * @param {number} originY Origin Y.\n * @param {number} w Width.\n * @param {number} h Height.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {import(\"../size.js\").Size} scale Scale.\n */\nexport function drawImageOrLabel(context, transform, opacity, labelOrImage, originX, originY, w, h, x, y, scale) {\n    context.save();\n    if (opacity !== 1) {\n        context.globalAlpha *= opacity;\n    }\n    if (transform) {\n        context.setTransform.apply(context, transform);\n    }\n    if ( /** @type {*} */(labelOrImage).contextInstructions) {\n        // label\n        context.translate(x, y);\n        context.scale(scale[0], scale[1]);\n        executeLabelInstructions(/** @type {Label} */ (labelOrImage), context);\n    }\n    else if (scale[0] < 0 || scale[1] < 0) {\n        // flipped image\n        context.translate(x, y);\n        context.scale(scale[0], scale[1]);\n        context.drawImage(\n        /** @type {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} */ (labelOrImage), originX, originY, w, h, 0, 0, w, h);\n    }\n    else {\n        // if image not flipped translate and scale can be avoided\n        context.drawImage(\n        /** @type {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} */ (labelOrImage), originX, originY, w, h, x, y, w * scale[0], h * scale[1]);\n    }\n    context.restore();\n}\n/**\n * @param {Label} label Label.\n * @param {CanvasRenderingContext2D} context Context.\n */\nfunction executeLabelInstructions(label, context) {\n    var contextInstructions = label.contextInstructions;\n    for (var i = 0, ii = contextInstructions.length; i < ii; i += 2) {\n        if (Array.isArray(contextInstructions[i + 1])) {\n            context[contextInstructions[i]].apply(context, contextInstructions[i + 1]);\n        }\n        else {\n            context[contextInstructions[i]] = contextInstructions[i + 1];\n        }\n    }\n}\n//# sourceMappingURL=canvas.js.map"],"names":[],"sourceRoot":""}