Merge branch 'Jalview-JS/develop' into merge_js_develop

[jalview.git] / src / swingjs / api / js / HTML5Canvas.java

diff --git a/src/swingjs/api/js/HTML5Canvas.java b/src/swingjs/api/js/HTML5Canvas.java
new file mode 100644 (file)
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;
+       }
+
+}