rewrite quic.js to be a native javascript implementation

There remain a few TODOs including implementing more than just rgb32 images

Signed-off-by: Aric Stewart <aric@codeweavers.com>

TODO

@@ -28,9 +28,6 @@ Medium Tasks:
 
   . Use the 'real' DataView if we have it
 
-  . Remove main() from quic.c and respin it
-      - It's causing unneeded bloat and memory use.
-
   . Consider passing a status change event back to the front end
     (e.g. indicators for numlock, connection status, all that jazz)
 
@@ -71,11 +68,6 @@ Big Tasks:
   . Profile the whole mess
     - Initial profiling suggests image decompression is the big hog
 
-  . Quic:  faster implementations
-      * current implementation is approximately 13x slower
-        than equivalent C code.  Should be able to do
-        much better than that.
-
   . Implement agent support
 
   . Build a test suite for measuring performance

display.js

@@ -50,9 +50,6 @@ function stripAlpha(d)
         d.data[i + 3] = 255;
 }
 
-// FIXME - this is a hack for quic.js, I should fix this...
-var global_ctx;
-
 /*----------------------------------------------------------------------------
 **  SpiceDisplayConn
 **      Drive the Spice Display Channel
@@ -108,16 +105,19 @@ SpiceDisplayConn.prototype.process_channel_message = function(msg)
 
             if (draw_copy.data.src_bitmap.descriptor.type == SPICE_IMAGE_TYPE_QUIC)
             {
+                var canvas = this.surfaces[draw_copy.base.surface_id].canvas;
                 if (! draw_copy.data.src_bitmap.quic)
                 {
                     this.log_warn("FIXME: DrawCopy could not handle this QUIC file.");
                     return false;
                 }
+                var source_img = convert_spice_quic_to_web(canvas.context,
+                                        draw_copy.data.src_bitmap.quic);
 
                 return this.draw_copy_helper(
                     { base: draw_copy.base,
                       src_area: draw_copy.data.src_area,
-                      image_data: draw_copy.data.src_bitmap.quic.imgData,
+                      image_data: source_img,
                       tag: "copyquic." + draw_copy.data.src_bitmap.quic.type,
                       has_alpha: (draw_copy.data.src_bitmap.quic.type == QUIC_IMAGE_TYPE_RGBA ? true : false) ,
                       descriptor : draw_copy.data.src_bitmap.descriptor
@@ -404,7 +404,6 @@ SpiceDisplayConn.prototype.process_channel_message = function(msg)
 
             /* This .save() is done entirely to enable SPICE_MSG_DISPLAY_RESET */
             canvas.context.save();
-            global_ctx = canvas.context; // FIXME - this is a hack entirely for the emscripten quic.js
             document.getElementById(this.parent.screen_id).appendChild(canvas);
             document.getElementById(this.parent.screen_id).setAttribute('width', m.surface.width);
             document.getElementById(this.parent.screen_id).setAttribute('height', m.surface.height);

makequic

@@ -1,8 +0,0 @@
-./emcc -o quic.js --shell-file quic.shell quic.c
-echo Okay, quic.js is partly ready.  Three things to do:
-echo 1.  In function _quic_decode_js, after the call to  simple_quic_decode,
-echo     add the code as given by quic.shell
-echo 2.  Delete the run() 3 line block near the bottom.
-echo 3.  Add the getQuic() function to the bottom (see quic.shell)
-        
-

spicetype.js

@@ -236,14 +236,8 @@ SpiceImage.prototype =
 
         if (this.descriptor.type == SPICE_IMAGE_TYPE_QUIC)
         {
-            var tmparr = [];
+            this.quic = new SpiceQuic;
-            var i;
+            at = this.quic.from_dv(dv, at, mb);
-            this.quicr_length = dv.getUint32(at, true); at += 4;
-            var qdv = new Uint8Array(mb.slice(at));
-            for (i = 0; i < qdv.length; i++)
-                tmparr[i] = qdv[i];
-            this.quic = getQuic(tmparr);
-            at += qdv.length;
         }
         return at;
     },