X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fswingjs%2Fapi%2Fjs%2FHTML5Canvas.java;fp=src%2Fswingjs%2Fapi%2Fjs%2FHTML5Canvas.java;h=f6d06041319f709f8ecd78378d7a8ee4879be31c;hb=586ade46bdcd05ff028a1cff82c3c527326d28ec;hp=0000000000000000000000000000000000000000;hpb=adcef27f5747b4e70e89a56c3735bc3afb8ce9bf;p=jalview.git

diff --git a/src/swingjs/api/js/HTML5Canvas.java b/src/swingjs/api/js/HTML5Canvas.java
new file mode 100644
index 0000000..f6d0604
--- /dev/null
+++ b/src/swingjs/api/js/HTML5Canvas.java
@@ -0,0 +1,59 @@
+package swingjs.api.js;
+
+import java.awt.image.BufferedImage;
+
+public interface HTML5Canvas extends DOMNode {
+
+	HTML5CanvasContext2D getContext(String str2d);
+
+	/*
+	 * Retrieves the byte[] data buffer from an HTML5 CANVAS element, optionally
+	 * first setting its contents to a source IMG, CANVAS, or VIDEO element.
+	 * 
+	 */
+	static byte[] getDataBufferBytes(HTML5Canvas canvas, DOMNode sourceNode, int w, int h) {
+		if (sourceNode != null) {
+			DOMNode.setAttrInt(canvas, "width", w);
+			DOMNode.setAttrInt(canvas, "height", h);
+		}
+		HTML5CanvasContext2D ctx = canvas.getContext("2d");
+		if (sourceNode != null) {
+			ctx.drawImage(sourceNode, 0, 0, w, h);
+		}
+		// Coerse int[] to byte[]
+		return (byte[]) (Object) ctx.getImageData(0, 0, w, h).data;
+	}
+
+	/**
+	 * Install a source image (img, video, or canvas) into a matching BufferedImage 
+	 * 
+	 * @param sourceNode
+	 * @param image
+	 */
+	static void setImageNode(DOMNode sourceNode, BufferedImage image) {
+		/**
+		 * @j2sNative
+		 * 
+		 * 			image._setImageNode$O$Z(sourceNode, false);
+		 * 
+		 */		{
+			// image._setImageNode(sourceNode, false);
+		 }
+	}
+	
+	
+
+	static HTML5Canvas createCanvas(int width, int height, String id) {
+		HTML5Canvas canvas = (HTML5Canvas) DOMNode.createElement("canvas", (id == null ? "img" + Math.random() : id + ""));
+		DOMNode.setStyles(canvas, "width", width + "px", "height", height + "px");
+		/**
+		 * @j2sNative
+		 * 
+		 * canvas.width = width;
+		 * canvas.height = height;
+		 * 
+		 */
+		return canvas;
+	}
+
+}