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2017-12-14 10:17:13 +01:00
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+/*
+ * JavaScript Load Image Orientation
+ * https://github.com/blueimp/JavaScript-Load-Image
+ *
+ * Copyright 2013, Sebastian Tschan
+ * https://blueimp.net
+ *
+ * Licensed under the MIT license:
+ * https://opensource.org/licenses/MIT
+ */
+
+/* global define */
+
+;(function (factory) {
+  'use strict'
+  if (typeof define === 'function' && define.amd) {
+    // Register as an anonymous AMD module:
+    define(['./load-image', './load-image-scale', './load-image-meta'], factory)
+  } else if (typeof module === 'object' && module.exports) {
+    factory(
+      require('./load-image'),
+      require('./load-image-scale'),
+      require('./load-image-meta')
+    )
+  } else {
+    // Browser globals:
+    factory(window.loadImage)
+  }
+})(function (loadImage) {
+  'use strict'
+
+  var originalHasCanvasOption = loadImage.hasCanvasOption
+  var originalHasMetaOption = loadImage.hasMetaOption
+  var originalTransformCoordinates = loadImage.transformCoordinates
+  var originalGetTransformedOptions = loadImage.getTransformedOptions
+
+  // Determines if the target image should be a canvas element:
+  loadImage.hasCanvasOption = function (options) {
+    return (
+      !!options.orientation || originalHasCanvasOption.call(loadImage, options)
+    )
+  }
+
+  // Determines if meta data should be loaded automatically:
+  loadImage.hasMetaOption = function (options) {
+    return (
+      (options && options.orientation === true) ||
+      originalHasMetaOption.call(loadImage, options)
+    )
+  }
+
+  // Transform image orientation based on
+  // the given EXIF orientation option:
+  loadImage.transformCoordinates = function (canvas, options) {
+    originalTransformCoordinates.call(loadImage, canvas, options)
+    var ctx = canvas.getContext('2d')
+    var width = canvas.width
+    var height = canvas.height
+    var styleWidth = canvas.style.width
+    var styleHeight = canvas.style.height
+    var orientation = options.orientation
+    if (!orientation || orientation > 8) {
+      return
+    }
+    if (orientation > 4) {
+      canvas.width = height
+      canvas.height = width
+      canvas.style.width = styleHeight
+      canvas.style.height = styleWidth
+    }
+    switch (orientation) {
+      case 2:
+        // horizontal flip
+        ctx.translate(width, 0)
+        ctx.scale(-1, 1)
+        break
+      case 3:
+        // 180° rotate left
+        ctx.translate(width, height)
+        ctx.rotate(Math.PI)
+        break
+      case 4:
+        // vertical flip
+        ctx.translate(0, height)
+        ctx.scale(1, -1)
+        break
+      case 5:
+        // vertical flip + 90 rotate right
+        ctx.rotate(0.5 * Math.PI)
+        ctx.scale(1, -1)
+        break
+      case 6:
+        // 90° rotate right
+        ctx.rotate(0.5 * Math.PI)
+        ctx.translate(0, -height)
+        break
+      case 7:
+        // horizontal flip + 90 rotate right
+        ctx.rotate(0.5 * Math.PI)
+        ctx.translate(width, -height)
+        ctx.scale(-1, 1)
+        break
+      case 8:
+        // 90° rotate left
+        ctx.rotate(-0.5 * Math.PI)
+        ctx.translate(-width, 0)
+        break
+    }
+  }
+
+  // Transforms coordinate and dimension options
+  // based on the given orientation option:
+  loadImage.getTransformedOptions = function (img, opts, data) {
+    var options = originalGetTransformedOptions.call(loadImage, img, opts)
+    var orientation = options.orientation
+    var newOptions
+    var i
+    if (orientation === true && data && data.exif) {
+      orientation = data.exif.get('Orientation')
+    }
+    if (!orientation || orientation > 8 || orientation === 1) {
+      return options
+    }
+    newOptions = {}
+    for (i in options) {
+      if (options.hasOwnProperty(i)) {
+        newOptions[i] = options[i]
+      }
+    }
+    newOptions.orientation = orientation
+    switch (orientation) {
+      case 2:
+        // horizontal flip
+        newOptions.left = options.right
+        newOptions.right = options.left
+        break
+      case 3:
+        // 180° rotate left
+        newOptions.left = options.right
+        newOptions.top = options.bottom
+        newOptions.right = options.left
+        newOptions.bottom = options.top
+        break
+      case 4:
+        // vertical flip
+        newOptions.top = options.bottom
+        newOptions.bottom = options.top
+        break
+      case 5:
+        // vertical flip + 90 rotate right
+        newOptions.left = options.top
+        newOptions.top = options.left
+        newOptions.right = options.bottom
+        newOptions.bottom = options.right
+        break
+      case 6:
+        // 90° rotate right
+        newOptions.left = options.top
+        newOptions.top = options.right
+        newOptions.right = options.bottom
+        newOptions.bottom = options.left
+        break
+      case 7:
+        // horizontal flip + 90 rotate right
+        newOptions.left = options.bottom
+        newOptions.top = options.right
+        newOptions.right = options.top
+        newOptions.bottom = options.left
+        break
+      case 8:
+        // 90° rotate left
+        newOptions.left = options.bottom
+        newOptions.top = options.left
+        newOptions.right = options.top
+        newOptions.bottom = options.right
+        break
+    }
+    if (newOptions.orientation > 4) {
+      newOptions.maxWidth = options.maxHeight
+      newOptions.maxHeight = options.maxWidth
+      newOptions.minWidth = options.minHeight
+      newOptions.minHeight = options.minWidth
+      newOptions.sourceWidth = options.sourceHeight
+      newOptions.sourceHeight = options.sourceWidth
+    }
+    return newOptions
+  }
+})