Merge pull request #3 from Aiosa/rotation-seams

Exposing matrix implementation, automatic drawer recognition

Thanks, @Aiosa!

Gruntfile.js

@@ -28,6 +28,7 @@ module.exports = function(grunt) {
         coverageDir = 'coverage/' + dateFormat(new Date(), 'yyyymmdd-HHMMss'),
         sources = [
             "src/openseadragon.js",
+            "src/matrix.js",
             "src/fullscreen.js",
             "src/eventsource.js",
             "src/mousetracker.js",
@@ -64,7 +65,15 @@ module.exports = function(grunt) {
             "src/viewport.js",
             "src/tiledimage.js",
             "src/tilecache.js",
-            "src/world.js"
+            "src/world.js",
+
+            // Aiosa's webgl drawer - needs optimization, polishing, trimming
+            // "src/webgl/webGLWrapper.js",
+            // "src/webgl/visualisationLayer.js",
+            // "src/webgl/dataLoader.js",
+            // "src/webgl/webGLContext.js",
+            // "src/webgl/drawer.js",
+            // "src/webgl/plainShader.js",
         ];
 
     var banner = "//! <%= pkg.name %> <%= pkg.version %>\n" +
@@ -195,7 +204,7 @@ module.exports = function(grunt) {
             }
         },
         watch: {
-            files: [ "Gruntfile.js", "src/*.js", "images/*" ],
+            files: [ "Gruntfile.js", "src/*.js", "images/*" /*, "src/webgl/*.js" */ ],
             tasks: "watchTask"
         },
         eslint: {

src/drawerbase.js

@@ -108,9 +108,7 @@ $.DrawerBase = class DrawerBase{
 
         this._checkForAPIOverrides();
     }
-    get isOpenSeadragonDrawer(){
-        return true;
-    }
+
     get canvas(){
         if(!this._renderingTarget){
             this._renderingTarget = this.createDrawingElement();

src/matrix.js

@@ -0,0 +1,123 @@
+/*
+ * OpenSeadragon - Mat3
+ *
+ * Modified from https://webglfundamentals.org/webgl/lessons/webgl-2d-matrices.html
+ * Copyright (C) 2010-2023 webglfundamentals.org and OpenSeadragon contributors
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of CodePlex Foundation nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+(function( $ ){
+
+/**
+ * Matrix left-to-right system representation
+ */
+$.Mat3 = class Mat3 {
+    constructor(values){
+        if(!values) {
+            values = [
+                0, 0, 0,
+                0, 0, 0,
+                0, 0, 0
+            ];
+        }
+
+        this.values = values;
+    }
+
+    static makeIdentity(){
+        return new Mat3([
+            1, 0, 0,
+            0, 1, 0,
+            0, 0, 1
+        ]);
+    }
+
+    static makeTranslation(tx, ty) {
+        return new Mat3([
+            1, 0, 0,
+            0, 1, 0,
+            tx, ty, 1,
+        ]);
+    }
+
+    static makeRotation(angleInRadians) {
+        var c = Math.cos(angleInRadians);
+        var s = Math.sin(angleInRadians);
+        return new Mat3([
+            c, -s, 0,
+            s, c, 0,
+            0, 0, 1,
+        ]);
+    }
+
+    static makeScaling(sx, sy) {
+        return new Mat3([
+            sx, 0, 0,
+            0, sy, 0,
+            0, 0, 1,
+        ]);
+    }
+
+    multiply(other) {
+        let a = this.values;
+        let b = other.values;
+
+        var a00 = a[0 * 3 + 0];
+        var a01 = a[0 * 3 + 1];
+        var a02 = a[0 * 3 + 2];
+        var a10 = a[1 * 3 + 0];
+        var a11 = a[1 * 3 + 1];
+        var a12 = a[1 * 3 + 2];
+        var a20 = a[2 * 3 + 0];
+        var a21 = a[2 * 3 + 1];
+        var a22 = a[2 * 3 + 2];
+        var b00 = b[0 * 3 + 0];
+        var b01 = b[0 * 3 + 1];
+        var b02 = b[0 * 3 + 2];
+        var b10 = b[1 * 3 + 0];
+        var b11 = b[1 * 3 + 1];
+        var b12 = b[1 * 3 + 2];
+        var b20 = b[2 * 3 + 0];
+        var b21 = b[2 * 3 + 1];
+        var b22 = b[2 * 3 + 2];
+        return new Mat3([
+            b00 * a00 + b01 * a10 + b02 * a20,
+            b00 * a01 + b01 * a11 + b02 * a21,
+            b00 * a02 + b01 * a12 + b02 * a22,
+            b10 * a00 + b11 * a10 + b12 * a20,
+            b10 * a01 + b11 * a11 + b12 * a21,
+            b10 * a02 + b11 * a12 + b12 * a22,
+            b20 * a00 + b21 * a10 + b22 * a20,
+            b20 * a01 + b21 * a11 + b22 * a21,
+            b20 * a02 + b21 * a12 + b22 * a22,
+        ]);
+    }
+};
+
+}( OpenSeadragon ));

src/tiledimage.js

@@ -1473,7 +1473,7 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
      * @param {Number} levelOpacity
      * @param {Number} currentTime
      * @param {Boolean} lowestLevel
-     * @returns {Boolean} whether the opacity of this tile has changed
+     * @returns {Boolean} true if blending did not yet finish
      */
     _blendTile: function(tile, x, y, level, levelOpacity, currentTime, lowestLevel ){
         let blendTimeMillis = 1000 * this.blendTime,

src/viewer.js

@@ -445,33 +445,30 @@ $.Viewer = function( options ) {
 
         delete this.drawerOptions.useCanvas;
     }
-    let drawerPriority = Array.isArray(this.drawer) ? this.drawer : [this.drawer];
-    let drawersToTry = drawerPriority.filter(d => ['webgl', 'canvas', 'html'].includes(d) || (d.prototype && d.prototype.isOpenSeadragonDrawer) );
-    if(drawerPriority.length !== drawersToTry.length){
-        $.console.error('An invalid drawer was requested.');
-    }
-    if(drawersToTry.length === 0){
-        drawersToTry = [$.DEFAULT_SETTINGS.drawer].flat(); // ensure it is a list
+    let drawerCandidates = Array.isArray(this.drawer) ? this.drawer : [this.drawer];
+    if (drawerCandidates.length === 0){
+        drawerCandidates = [$.DEFAULT_SETTINGS.drawer].flat(); // ensure it is a list
         $.console.warn('No valid drawers were selected. Using the default value.');
     }
     // extend the drawerOptions object with additional properties to pass to the Drawer implementation
-    this.drawer = null; // TO DO: how to deal with the possibility that none of the requested drawers are supported?
-    for(let i = 0; i < drawersToTry.length; i++){
-        let Drawer = drawersToTry[i];
-        let optsKey = null;
-        // replace text-based option with appropriate constructor
-        if (Drawer === 'canvas'){
-            Drawer = $.CanvasDrawer;
-            optsKey = 'canvas';
-        } else if (Drawer === 'html'){
-            Drawer = $.HTMLDrawer;
-            optsKey = 'html';
-        } else if (Drawer === 'webgl'){
-            Drawer = $.WebGLDrawer;
-            optsKey = 'webgl';
+    // TODO: how to deal with the possibility that none of the requested drawers are supported?
+    this.drawer = null;
+    for (let i = 0; i < drawerCandidates.length; i++) {
+
+        let drawerCandidate = drawerCandidates[i];
+        let Drawer = null;
+
+        //if inherits from a drawer base, use it
+        if (drawerCandidate && drawerCandidate.prototype instanceof $.DrawerBase) {
+            Drawer = drawerCandidate;
+            drawerCandidate = 'custom';
+        } else if (typeof drawerCandidate === "string") {
+            Drawer = $.determineDrawer(drawerCandidate);
         } else {
-            optsKey = 'custom';
+            $.console.warn('Unsupported drawer! Drawer must be an existing string type, or a class that extends OpenSeadragon.DrawerBase.');
+            continue;
         }
+
         // if the drawer is supported, create it and break the loop
         if (Drawer.isSupported()) {
             this.drawer = new Drawer({
@@ -479,13 +476,13 @@ $.Viewer = function( options ) {
                 viewport:           this.viewport,
                 element:            this.canvas,
                 debugGridColor:     this.debugGridColor,
-                options:            this.drawerOptions[optsKey],
+                options:            this.drawerOptions[drawerCandidate],
             });
             this.drawerOptions.constructor = Drawer;
             break;
         }
     }
-    if(this.drawer === null){
+    if (!this.drawer){
         $.console.error('No drawer could be created!');
         throw('Error with creating the selected drawer(s)');
     }
@@ -4002,4 +3999,22 @@ function onFlip() {
    this.viewport.toggleFlip();
 }
 
+/**
+ * Find drawer
+ */
+$.determineDrawer = function( id ){
+    for (let property in OpenSeadragon) {
+        const drawer = OpenSeadragon[ property ],
+            proto = drawer.prototype;
+        if( proto &&
+            proto instanceof OpenSeadragon.DrawerBase &&
+            $.isFunction( proto.getType ) &&
+            proto.getType.call( drawer ) === id
+        ){
+            return drawer;
+        }
+    }
+    return null;
+};
+
 }( OpenSeadragon ));

src/webgldrawer.js

@@ -35,92 +35,6 @@
 
 (function( $ ){
 
-    // internal class Mat3: implements matrix operations
-    // Modified from https://webglfundamentals.org/webgl/lessons/webgl-2d-matrices.html
-   class Mat3{
-       constructor(values){
-           if(!values) {
-               values = [
-                   0, 0, 0,
-                   0, 0, 0,
-                   0, 0, 0
-               ];
-           }
-
-           this.values = values;
-       }
-
-       static makeIdentity(){
-           return new Mat3([
-               1, 0, 0,
-               0, 1, 0,
-               0, 0, 1
-           ]);
-       }
-
-       static makeTranslation(tx, ty) {
-           return new Mat3([
-               1, 0, 0,
-               0, 1, 0,
-               tx, ty, 1,
-           ]);
-       }
-
-       static makeRotation(angleInRadians) {
-           var c = Math.cos(angleInRadians);
-           var s = Math.sin(angleInRadians);
-           return new Mat3([
-               c, -s, 0,
-               s, c, 0,
-               0, 0, 1,
-           ]);
-       }
-
-       static makeScaling(sx, sy) {
-           return new Mat3([
-               sx, 0, 0,
-               0, sy, 0,
-               0, 0, 1,
-           ]);
-       }
-
-       multiply(other) {
-           let a = this.values;
-           let b = other.values;
-
-           var a00 = a[0 * 3 + 0];
-           var a01 = a[0 * 3 + 1];
-           var a02 = a[0 * 3 + 2];
-           var a10 = a[1 * 3 + 0];
-           var a11 = a[1 * 3 + 1];
-           var a12 = a[1 * 3 + 2];
-           var a20 = a[2 * 3 + 0];
-           var a21 = a[2 * 3 + 1];
-           var a22 = a[2 * 3 + 2];
-           var b00 = b[0 * 3 + 0];
-           var b01 = b[0 * 3 + 1];
-           var b02 = b[0 * 3 + 2];
-           var b10 = b[1 * 3 + 0];
-           var b11 = b[1 * 3 + 1];
-           var b12 = b[1 * 3 + 2];
-           var b20 = b[2 * 3 + 0];
-           var b21 = b[2 * 3 + 1];
-           var b22 = b[2 * 3 + 2];
-           return new Mat3([
-               b00 * a00 + b01 * a10 + b02 * a20,
-               b00 * a01 + b01 * a11 + b02 * a21,
-               b00 * a02 + b01 * a12 + b02 * a22,
-               b10 * a00 + b11 * a10 + b12 * a20,
-               b10 * a01 + b11 * a11 + b12 * a21,
-               b10 * a02 + b11 * a12 + b12 * a22,
-               b20 * a00 + b21 * a10 + b22 * a20,
-               b20 * a01 + b21 * a11 + b22 * a21,
-               b20 * a02 + b21 * a12 + b22 * a22,
-           ]);
-       }
-
-   }
-
    /**
     * @class WebGLDrawer
     * @memberof OpenSeadragon
@@ -277,9 +191,9 @@
 
             let flipMultiplier = this.viewport.flipped ? -1 : 1;
             // calculate view matrix for viewer
-            let posMatrix = Mat3.makeTranslation(-viewport.center.x, -viewport.center.y);
-            let scaleMatrix = Mat3.makeScaling(2 / viewport.bounds.width * flipMultiplier, -2 / viewport.bounds.height);
-            let rotMatrix = Mat3.makeRotation(-viewport.rotation);
+            let posMatrix = $.Mat3.makeTranslation(-viewport.center.x, -viewport.center.y);
+            let scaleMatrix = $.Mat3.makeScaling(2 / viewport.bounds.width * flipMultiplier, -2 / viewport.bounds.height);
+            let rotMatrix = $.Mat3.makeRotation(-viewport.rotation);
             let viewMatrix = scaleMatrix.multiply(rotMatrix).multiply(posMatrix);
 
             gl.bindFramebuffer(gl.FRAMEBUFFER, null);
@@ -343,10 +257,10 @@
                 let imageRotation = tiledImage.getRotation(true);
                 // if needed, handle the tiledImage being rotated
                 if( imageRotation % 360 !== 0){
-                    let imageRotationMatrix = Mat3.makeRotation(-imageRotation * Math.PI / 180);
+                    let imageRotationMatrix = $.Mat3.makeRotation(-imageRotation * Math.PI / 180);
                     let imageCenter = tiledImage.getBoundsNoRotate(true).getCenter();
-                    let t1 = Mat3.makeTranslation(imageCenter.x, imageCenter.y);
-                    let t2 = Mat3.makeTranslation(-imageCenter.x, -imageCenter.y);
+                    let t1 = $.Mat3.makeTranslation(imageCenter.x, imageCenter.y);
+                    let t2 = $.Mat3.makeTranslation(-imageCenter.x, -imageCenter.y);
 
                     // update the view matrix to account for this image's rotation
                     let localMatrix = t1.multiply(imageRotationMatrix).multiply(t2);
@@ -572,7 +486,7 @@
             let w = right - x;
             let h = bottom - y;
 
-            let matrix = new Mat3([
+            let matrix = new $.Mat3([
                 w, 0, 0,
                 0, h, 0,
                 x, y, 1,
@@ -580,11 +494,11 @@
 
             if(tile.flipped){
                 // flip the tile around the center of the unit quad
-                let t1 = Mat3.makeTranslation(0.5, 0);
-                let t2 = Mat3.makeTranslation(-0.5, 0);
+                let t1 = $.Mat3.makeTranslation(0.5, 0);
+                let t2 = $.Mat3.makeTranslation(-0.5, 0);
 
                 // update the view matrix to account for this image's rotation
-                let localMatrix = t1.multiply(Mat3.makeScaling(-1, 1)).multiply(t2);
+                let localMatrix = t1.multiply($.Mat3.makeScaling(-1, 1)).multiply(t2);
                 matrix = matrix.multiply(localMatrix);
             }
 
@@ -798,7 +712,7 @@
             gl.enableVertexAttribArray(this._secondPass.aTexturePosition);
 
             // set the matrix that transforms the framebuffer to clip space
-            let matrix = Mat3.makeScaling(2, 2).multiply(Mat3.makeTranslation(-0.5, -0.5));
+            let matrix = $.Mat3.makeScaling(2, 2).multiply($.Mat3.makeTranslation(-0.5, -0.5));
             gl.uniformMatrix3fv(this._secondPass.uMatrix, false, matrix.values);
         }
 
@@ -957,8 +871,6 @@
             } catch (e){
                 $.console.error('Error uploading image data to WebGL', e);
             }
-
-
         }
 
         _imageUnloadedHandler(event){

test/demo/drawerperformance.js

@@ -30,7 +30,10 @@ let viewer;
 $('#create-drawer').on('click',function(){
     let drawerType = $('#select-drawer').val();
     let num = Math.floor($('#input-number').val());
+    run(drawerType, num);
+});
 
+function run(drawerType, num) {
     if(viewer){
         viewer.destroy();
     }
@@ -57,8 +60,7 @@ $('#create-drawer').on('click',function(){
         viewer.viewport.panBy(new OpenSeadragon.Point( dist * m/2, 0));
 
     }, 1000);
-
-});
+}
 
 function makeViewer(drawerType){
     let viewer = OpenSeadragon({

test/demo/webgldemodrawer.js

@@ -302,8 +302,8 @@
                                         tiledImage._croppingPolygons ||
                                         tiledImage.debugMode
                                     );
-                let useTwoPassRendering = useContext2dPipeline || (tiledImage.opacity < 1); // TO DO: check hasTransparency in addition to opacity
               
+                let useTwoPassRendering = useContext2dPipeline ||(tiledImage.opacity < 1); // TODO: check hasTransparency in addition to opacity
 
                 let tilesToDraw = tiledImage.getTilesToDraw();