fix: cpu canvas check

Author: robertleeplummerjr

bin/gpu-core.js

@@ -4,8 +4,8 @@
  *
  * GPU Accelerated JavaScript
  *
- * @version 1.10.3
- * @date Sun Nov 18 2018 14:38:47 GMT-0500 (EST)
+ * @version 1.10.4
+ * @date Sun Nov 18 2018 15:47:22 GMT-0500 (EST)
  *
  * @license MIT
  * The MIT License

bin/gpu-core.min.js

@@ -4,8 +4,8 @@
  *
  * GPU Accelerated JavaScript
  *
- * @version 1.10.3
- * @date Sun Nov 18 2018 14:38:47 GMT-0500 (EST)
+ * @version 1.10.4
+ * @date Sun Nov 18 2018 15:47:22 GMT-0500 (EST)
  *
  * @license MIT
  * The MIT License
@@ -890,16 +890,22 @@ module.exports = function (_KernelBase) {
 			this.setupParams(arguments);
 			this.validateOptions();
 			var canvas = this._canvas;
-			this._canvasCtx = canvas.getContext('2d');
+			if (canvas) {
+				this._canvasCtx = canvas.getContext('2d');
+			}
 			var threadDim = this.threadDim = utils.clone(this.output);
 
 			while (threadDim.length < 3) {
 				threadDim.push(1);
 			}
 
 			if (this.graphical) {
-				canvas.width = threadDim[0];
-				canvas.height = threadDim[1];
+				var _canvas = this._canvas;
+				if (!_canvas) {
+					throw new Error('no canvas available for using graphical output');
+				}
+				_canvas.width = threadDim[0];
+				_canvas.height = threadDim[1];
 				this._imageData = this._canvasCtx.createImageData(threadDim[0], threadDim[1]);
 				this._colorData = new Uint8ClampedArray(threadDim[0] * threadDim[1] * 4);
 			}

bin/gpu.js

@@ -19,7 +19,7 @@ module.exports = function (_KernelBase) {
   * @constructor CPUKernel
   *
   * @desc Kernel Implementation for CPU.
-  * 
+  *
   * <p>Instantiates properties to the CPU Kernel.</p>
   *
   * @extends KernelBase
@@ -60,7 +60,7 @@ module.exports = function (_KernelBase) {
   * @function
   * @name validateOptions
   *
-  * @desc Validate options related to CPU Kernel, such as 
+  * @desc Validate options related to CPU Kernel, such as
   * dimensions size, and auto dimension support.
   *
   */
@@ -92,8 +92,8 @@ module.exports = function (_KernelBase) {
    * @function
    * @name build
    *
-   * @desc Builds the Kernel, by generating the kernel 
-   * string using thread dimensions, and arguments 
+   * @desc Builds the Kernel, by generating the kernel
+   * string using thread dimensions, and arguments
    * supplied to the kernel.
    *
    * <p>If the graphical flag is enabled, canvas is used.</p>
@@ -107,16 +107,23 @@ module.exports = function (_KernelBase) {
 			this.setupParams(arguments);
 			this.validateOptions();
 			var canvas = this._canvas;
-			this._canvasCtx = canvas.getContext('2d');
+			if (canvas) {
+				// if node or canvas is not found, don't die
+				this._canvasCtx = canvas.getContext('2d');
+			}
 			var threadDim = this.threadDim = utils.clone(this.output);
 
 			while (threadDim.length < 3) {
 				threadDim.push(1);
 			}
 
 			if (this.graphical) {
-				canvas.width = threadDim[0];
-				canvas.height = threadDim[1];
+				var _canvas = this._canvas;
+				if (!_canvas) {
+					throw new Error('no canvas available for using graphical output');
+				}
+				_canvas.width = threadDim[0];
+				_canvas.height = threadDim[1];
 				this._imageData = this._canvasCtx.createImageData(threadDim[0], threadDim[1]);
 				this._colorData = new Uint8ClampedArray(threadDim[0] * threadDim[1] * 4);
 			}
@@ -165,7 +172,7 @@ module.exports = function (_KernelBase) {
    * @name getKernelString
    *
    * @desc Generates kernel string for this kernel program.
-   * 
+   *
    * <p>If sub-kernels are supplied, they are also factored in.
    * This string can be saved by calling the `toString` method
    * and then can be reused later.</p>

bin/gpu.min.js

@@ -1,6 +1,6 @@
 {
   "name": "gpu.js",
-  "version": "1.10.3",
+  "version": "1.10.4",
   "description": "GPU Accelerated JavaScript",
   "main": "./dist/index.js",
   "files": [

dist/backend/cpu/kernel.js

@@ -10,7 +10,7 @@ module.exports = class CPUKernel extends KernelBase {
 	 * @constructor CPUKernel
 	 *
 	 * @desc Kernel Implementation for CPU.
-	 * 
+	 *
 	 * <p>Instantiates properties to the CPU Kernel.</p>
 	 *
 	 * @extends KernelBase
@@ -47,7 +47,7 @@ module.exports = class CPUKernel extends KernelBase {
 	 * @function
 	 * @name validateOptions
 	 *
-	 * @desc Validate options related to CPU Kernel, such as 
+	 * @desc Validate options related to CPU Kernel, such as
 	 * dimensions size, and auto dimension support.
 	 *
 	 */
@@ -75,8 +75,8 @@ module.exports = class CPUKernel extends KernelBase {
 	 * @function
 	 * @name build
 	 *
-	 * @desc Builds the Kernel, by generating the kernel 
-	 * string using thread dimensions, and arguments 
+	 * @desc Builds the Kernel, by generating the kernel
+	 * string using thread dimensions, and arguments
 	 * supplied to the kernel.
 	 *
 	 * <p>If the graphical flag is enabled, canvas is used.</p>
@@ -87,14 +87,21 @@ module.exports = class CPUKernel extends KernelBase {
 		this.setupParams(arguments);
 		this.validateOptions();
 		const canvas = this._canvas;
-		this._canvasCtx = canvas.getContext('2d');
+		if (canvas) {
+			// if node or canvas is not found, don't die
+			this._canvasCtx = canvas.getContext('2d');
+		}
 		const threadDim = this.threadDim = utils.clone(this.output);
 
 		while (threadDim.length < 3) {
 			threadDim.push(1);
 		}
 
 		if (this.graphical) {
+			const canvas = this._canvas;
+			if (!canvas) {
+				throw new Error('no canvas available for using graphical output');
+			}
 			canvas.width = threadDim[0];
 			canvas.height = threadDim[1];
 			this._imageData = this._canvasCtx.createImageData(threadDim[0], threadDim[1]);
@@ -144,7 +151,7 @@ module.exports = class CPUKernel extends KernelBase {
 	 * @name getKernelString
 	 *
 	 * @desc Generates kernel string for this kernel program.
-	 * 
+	 *
 	 * <p>If sub-kernels are supplied, they are also factored in.
 	 * This string can be saved by calling the `toString` method
 	 * and then can be reused later.</p>

package.json

@@ -89,5 +89,6 @@
   <script src="issues/382-bad-constant.js"></script>
   <script src="issues/390-thread-assignment.js"></script>
   <script src="issues/399-double-definition.js"></script>
+  <script src="issues/401-cpu-canvas-check.js"></script>
 </body>
 </html>

src/backend/cpu/kernel.js

@@ -0,0 +1,30 @@
+(function() {
+	QUnit.test('Issue #401 - cpu no canvas graphical', function(assert) {
+		assert.throws(function() {
+			GPU.CPUKernel.prototype.build.apply({
+        setupConstants: function() {},
+        setupParams: function() {},
+        validateOptions: function() {},
+        getKernelString: function() {},
+        graphical: true,
+				output: [1],
+				_canvas: null
+			}, []);
+		},
+			new Error('no canvas available for using graphical output'),
+			'throws when canvas is not available and using graphical output');
+	});
+
+  QUnit.test('Issue #401 - cpu no canvas', function(assert) {
+		GPU.CPUKernel.prototype.build.apply({
+			setupConstants: function() {},
+			setupParams: function() {},
+			validateOptions: function() {},
+      getKernelString: function() {},
+			graphical: false,
+			output: [1],
+			_canvas: null
+		}, []);
+		assert.equal(true, true, 'ok when canvas is not available and not using graphical output');
+	});
+})();