diff options
Diffstat (limited to 'chromium/chrome/browser/resources/file_manager/foreground/js/image_editor/viewport.js')
-rw-r--r-- | chromium/chrome/browser/resources/file_manager/foreground/js/image_editor/viewport.js | 430 |
1 files changed, 0 insertions, 430 deletions
diff --git a/chromium/chrome/browser/resources/file_manager/foreground/js/image_editor/viewport.js b/chromium/chrome/browser/resources/file_manager/foreground/js/image_editor/viewport.js deleted file mode 100644 index 4d6b8ea0874..00000000000 --- a/chromium/chrome/browser/resources/file_manager/foreground/js/image_editor/viewport.js +++ /dev/null @@ -1,430 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -'use strict'; - -/** - * Viewport class controls the way the image is displayed (scale, offset etc). - * @constructor - */ -function Viewport() { - this.imageBounds_ = new Rect(); - this.screenBounds_ = new Rect(); - - this.scale_ = 1; - this.offsetX_ = 0; - this.offsetY_ = 0; - - this.generation_ = 0; - - this.scaleControl_ = null; - this.repaintCallbacks_ = []; - this.update(); -} - -/* - * Viewport modification. - */ - -/** - * @param {Object} scaleControl The UI object responsible for scaling. - */ -Viewport.prototype.setScaleControl = function(scaleControl) { - this.scaleControl_ = scaleControl; -}; - -/** - * @param {number} width Image width. - * @param {number} height Image height. - */ -Viewport.prototype.setImageSize = function(width, height) { - this.imageBounds_ = new Rect(width, height); - if (this.scaleControl_) this.scaleControl_.displayImageSize(width, height); - this.invalidateCaches(); -}; - -/** - * @param {number} width Screen width. - * @param {number} height Screen height. - */ -Viewport.prototype.setScreenSize = function(width, height) { - this.screenBounds_ = new Rect(width, height); - if (this.scaleControl_) - this.scaleControl_.setMinScale(this.getFittingScale()); - this.invalidateCaches(); -}; - -/** - * Set the size by an HTML element. - * - * @param {HTMLElement} frame The element acting as the "screen". - */ -Viewport.prototype.sizeByFrame = function(frame) { - this.setScreenSize(frame.clientWidth, frame.clientHeight); -}; - -/** - * Set the size and scale to fit an HTML element. - * - * @param {HTMLElement} frame The element acting as the "screen". - */ -Viewport.prototype.sizeByFrameAndFit = function(frame) { - var wasFitting = this.getScale() == this.getFittingScale(); - this.sizeByFrame(frame); - var minScale = this.getFittingScale(); - if (wasFitting || (this.getScale() < minScale)) { - this.setScale(minScale, true); - } -}; - -/** - * @return {number} Scale. - */ -Viewport.prototype.getScale = function() { return this.scale_ }; - -/** - * @param {number} scale The new scale. - * @param {boolean} notify True if the change should be reflected in the UI. - */ -Viewport.prototype.setScale = function(scale, notify) { - if (this.scale_ == scale) return; - this.scale_ = scale; - if (notify && this.scaleControl_) this.scaleControl_.displayScale(scale); - this.invalidateCaches(); -}; - -/** - * @return {number} Best scale to fit the current image into the current screen. - */ -Viewport.prototype.getFittingScale = function() { - var scaleX = this.screenBounds_.width / this.imageBounds_.width; - var scaleY = this.screenBounds_.height / this.imageBounds_.height; - // Scales > (1 / this.getDevicePixelRatio()) do not look good. Also they are - // not really useful as we do not have any pixel-level operations. - return Math.min(1 / Viewport.getDevicePixelRatio(), scaleX, scaleY); -}; - -/** - * Set the scale to fit the image into the screen. - */ -Viewport.prototype.fitImage = function() { - var scale = this.getFittingScale(); - if (this.scaleControl_) this.scaleControl_.setMinScale(scale); - this.setScale(scale, true); -}; - -/** - * @return {number} X-offset of the viewport. - */ -Viewport.prototype.getOffsetX = function() { return this.offsetX_ }; - -/** - * @return {number} Y-offset of the viewport. - */ -Viewport.prototype.getOffsetY = function() { return this.offsetY_ }; - -/** - * Set the image offset in the viewport. - * @param {number} x X-offset. - * @param {number} y Y-offset. - * @param {boolean} ignoreClipping True if no clipping should be applied. - */ -Viewport.prototype.setOffset = function(x, y, ignoreClipping) { - if (!ignoreClipping) { - x = this.clampOffsetX_(x); - y = this.clampOffsetY_(y); - } - if (this.offsetX_ == x && this.offsetY_ == y) return; - this.offsetX_ = x; - this.offsetY_ = y; - this.invalidateCaches(); -}; - -/** - * Return a closure that can be called to pan the image. - * Useful for implementing non-trivial variants of panning (overview etc). - * @param {number} originalX The x coordinate on the screen canvas that - * corresponds to zero change to offsetX. - * @param {number} originalY The y coordinate on the screen canvas that - * corresponds to zero change to offsetY. - * @param {function():number} scaleFunc returns the image to screen scale. - * @param {function(number,number):boolean} hitFunc returns true if (x,y) is - * in the valid region. - * @return {function} The closure to pan the image. - */ -Viewport.prototype.createOffsetSetter = function( - originalX, originalY, scaleFunc, hitFunc) { - var originalOffsetX = this.offsetX_; - var originalOffsetY = this.offsetY_; - if (!hitFunc) hitFunc = function() { return true }; - if (!scaleFunc) scaleFunc = this.getScale.bind(this); - - var self = this; - return function(x, y) { - if (hitFunc(x, y)) { - var scale = scaleFunc(); - self.setOffset( - originalOffsetX + (x - originalX) / scale, - originalOffsetY + (y - originalY) / scale); - self.repaint(); - } - }; -}; - -/* - * Access to the current viewport state. - */ - -/** - * @return {Rect} The image bounds in image coordinates. - */ -Viewport.prototype.getImageBounds = function() { return this.imageBounds_ }; - -/** -* @return {Rect} The screen bounds in screen coordinates. -*/ -Viewport.prototype.getScreenBounds = function() { return this.screenBounds_ }; - -/** - * @return {Rect} The visible part of the image, in image coordinates. - */ -Viewport.prototype.getImageClipped = function() { return this.imageClipped_ }; - -/** - * @return {Rect} The visible part of the image, in screen coordinates. - */ -Viewport.prototype.getScreenClipped = function() { return this.screenClipped_ }; - -/** - * A counter that is incremented with each viewport state change. - * Clients that cache anything that depends on the viewport state should keep - * track of this counter. - * @return {number} counter. - */ -Viewport.prototype.getCacheGeneration = function() { return this.generation_ }; - -/** - * Called on event view port state change (even if repaint has not been called). - */ -Viewport.prototype.invalidateCaches = function() { this.generation_++ }; - -/** - * @return {Rect} The image bounds in screen coordinates. - */ -Viewport.prototype.getImageBoundsOnScreen = function() { - return this.imageOnScreen_; -}; - -/* - * Conversion between the screen and image coordinate spaces. - */ - -/** - * @param {number} size Size in screen coordinates. - * @return {number} Size in image coordinates. - */ -Viewport.prototype.screenToImageSize = function(size) { - return size / this.getScale(); -}; - -/** - * @param {number} x X in screen coordinates. - * @return {number} X in image coordinates. - */ -Viewport.prototype.screenToImageX = function(x) { - return Math.round((x - this.imageOnScreen_.left) / this.getScale()); -}; - -/** - * @param {number} y Y in screen coordinates. - * @return {number} Y in image coordinates. - */ -Viewport.prototype.screenToImageY = function(y) { - return Math.round((y - this.imageOnScreen_.top) / this.getScale()); -}; - -/** - * @param {Rect} rect Rectangle in screen coordinates. - * @return {Rect} Rectangle in image coordinates. - */ -Viewport.prototype.screenToImageRect = function(rect) { - return new Rect( - this.screenToImageX(rect.left), - this.screenToImageY(rect.top), - this.screenToImageSize(rect.width), - this.screenToImageSize(rect.height)); -}; - -/** - * @param {number} size Size in image coordinates. - * @return {number} Size in screen coordinates. - */ -Viewport.prototype.imageToScreenSize = function(size) { - return size * this.getScale(); -}; - -/** - * @param {number} x X in image coordinates. - * @return {number} X in screen coordinates. - */ -Viewport.prototype.imageToScreenX = function(x) { - return Math.round(this.imageOnScreen_.left + x * this.getScale()); -}; - -/** - * @param {number} y Y in image coordinates. - * @return {number} Y in screen coordinates. - */ -Viewport.prototype.imageToScreenY = function(y) { - return Math.round(this.imageOnScreen_.top + y * this.getScale()); -}; - -/** - * @param {Rect} rect Rectangle in image coordinates. - * @return {Rect} Rectangle in screen coordinates. - */ -Viewport.prototype.imageToScreenRect = function(rect) { - return new Rect( - this.imageToScreenX(rect.left), - this.imageToScreenY(rect.top), - Math.round(this.imageToScreenSize(rect.width)), - Math.round(this.imageToScreenSize(rect.height))); -}; - -/** - * @return {number} The number of physical pixels in one CSS pixel. - */ -Viewport.getDevicePixelRatio = function() { return window.devicePixelRatio }; - -/** - * Convert a rectangle from screen coordinates to 'device' coordinates. - * - * This conversion enlarges the original rectangle devicePixelRatio times - * with the screen center as a fixed point. - * - * @param {Rect} rect Rectangle in screen coordinates. - * @return {Rect} Rectangle in device coordinates. - */ -Viewport.prototype.screenToDeviceRect = function(rect) { - var ratio = Viewport.getDevicePixelRatio(); - var screenCenterX = Math.round( - this.screenBounds_.left + this.screenBounds_.width / 2); - var screenCenterY = Math.round( - this.screenBounds_.top + this.screenBounds_.height / 2); - return new Rect(screenCenterX + (rect.left - screenCenterX) * ratio, - screenCenterY + (rect.top - screenCenterY) * ratio, - rect.width * ratio, - rect.height * ratio); -}; - -/** - * @return {Rect} The visible part of the image, in device coordinates. - */ -Viewport.prototype.getDeviceClipped = function() { - return this.screenToDeviceRect(this.getScreenClipped()); -}; - -/** - * @return {boolean} True if some part of the image is clipped by the screen. - */ -Viewport.prototype.isClipped = function() { - return this.getMarginX_() < 0 || this.getMarginY_() < 0; -}; - -/** - * @return {number} Horizontal margin. - * Negative if the image is clipped horizontally. - * @private - */ -Viewport.prototype.getMarginX_ = function() { - return Math.round( - (this.screenBounds_.width - this.imageBounds_.width * this.scale_) / 2); -}; - -/** - * @return {number} Vertical margin. - * Negative if the image is clipped vertically. - * @private - */ -Viewport.prototype.getMarginY_ = function() { - return Math.round( - (this.screenBounds_.height - this.imageBounds_.height * this.scale_) / 2); -}; - -/** - * @param {number} x X-offset. - * @return {number} X-offset clamped to the valid range. - * @private - */ -Viewport.prototype.clampOffsetX_ = function(x) { - var limit = Math.round(Math.max(0, -this.getMarginX_() / this.getScale())); - return ImageUtil.clamp(-limit, x, limit); -}; - -/** - * @param {number} y Y-offset. - * @return {number} Y-offset clamped to the valid range. - * @private - */ -Viewport.prototype.clampOffsetY_ = function(y) { - var limit = Math.round(Math.max(0, -this.getMarginY_() / this.getScale())); - return ImageUtil.clamp(-limit, y, limit); -}; - -/** - * Recalculate the viewport parameters. - */ -Viewport.prototype.update = function() { - var scale = this.getScale(); - - // Image bounds in screen coordinates. - this.imageOnScreen_ = new Rect( - this.getMarginX_(), - this.getMarginY_(), - Math.round(this.imageBounds_.width * scale), - Math.round(this.imageBounds_.height * scale)); - - // A visible part of the image in image coordinates. - this.imageClipped_ = new Rect(this.imageBounds_); - - // A visible part of the image in screen coordinates. - this.screenClipped_ = new Rect(this.screenBounds_); - - // Adjust for the offset. - if (this.imageOnScreen_.left < 0) { - this.imageOnScreen_.left += - Math.round(this.clampOffsetX_(this.offsetX_) * scale); - this.imageClipped_.left = Math.round(-this.imageOnScreen_.left / scale); - this.imageClipped_.width = Math.round(this.screenBounds_.width / scale); - } else { - this.screenClipped_.left = this.imageOnScreen_.left; - this.screenClipped_.width = this.imageOnScreen_.width; - } - - if (this.imageOnScreen_.top < 0) { - this.imageOnScreen_.top += - Math.round(this.clampOffsetY_(this.offsetY_) * scale); - this.imageClipped_.top = Math.round(-this.imageOnScreen_.top / scale); - this.imageClipped_.height = Math.round(this.screenBounds_.height / scale); - } else { - this.screenClipped_.top = this.imageOnScreen_.top; - this.screenClipped_.height = this.imageOnScreen_.height; - } -}; - -/** - * @param {function} callback Repaint callback. - */ -Viewport.prototype.addRepaintCallback = function(callback) { - this.repaintCallbacks_.push(callback); -}; - -/** - * Repaint all clients. - */ -Viewport.prototype.repaint = function() { - this.update(); - for (var i = 0; i != this.repaintCallbacks_.length; i++) - this.repaintCallbacks_[i](); -}; |