Merge a842140b51 into 7a16304e52

docs/notes

@@ -3,3 +3,4 @@ Rebuilding inflator.js
 - Download pako from npm
 - Install browserify using npm
 - browserify utils/inflator.partial.js -o include/inflator.js -s inflator
+- apply changes from utils/inflator.diff.js to include/inflator.js

include/display.js

@@ -32,6 +32,7 @@ var Display;
         // the full frame buffer (logical canvas) size
         this._fb_width = 0;
         this._fb_height = 0;
+        this._fb_cache = null;
 
         // the size limit of the viewport (start disabled)
         this._maxWidth = 0;
@@ -335,6 +336,7 @@ var Display;
 
             this._fb_width = width;
             this._fb_height = height;
+            this._fb_cache = new ArrayBuffer(width * height * 4);
 
             this._rescale(this._scale);
 
@@ -688,7 +690,8 @@ var Display;
         },
 
         _rgbImageData: function (x, y, vx, vy, width, height, arr, offset) {
-            var img = this._drawCtx.createImageData(width, height);
+            //var img = this._drawCtx.createImageData(width, height);
+            var img = new ImageData(new Uint8ClampedArray(this._fb_cache, 0, width * height * 4), width, height);
             var data = img.data;
             for (var i = 0, j = offset; i < width * height * 4; i += 4, j += 3) {
                 data[i]     = arr[j];
@@ -700,7 +703,8 @@ var Display;
         },
 
         _bgrxImageData: function (x, y, vx, vy, width, height, arr, offset) {
-            var img = this._drawCtx.createImageData(width, height);
+            //var img = this._drawCtx.createImageData(width, height);
+            var img = new ImageData(new Uint8ClampedArray(this._fb_cache, 0, width * height * 4), width, height);
             var data = img.data;
             for (var i = 0, j = offset; i < width * height * 4; i += 4, j += 4) {
                 data[i]     = arr[j + 2];

include/inflator.js

@@ -889,7 +889,7 @@ function inflate(strm, flush) {
   var len;                    /* length to copy for repeats, bits to drop */
   var ret;                    /* return code */
   var hbuf = new utils.Buf8(4);    /* buffer for gzip header crc calculation */
-  var opts;
+  var opts = {};
 
   var n; // temporary var for NEED_BITS
 
@@ -1425,7 +1425,7 @@ function inflate(strm, flush) {
       state.lencode = state.lendyn;
       state.lenbits = 7;
 
-      opts = {bits: state.lenbits};
+      opts.bits = state.lenbits;
       ret = inflate_table(CODES, state.lens, 0, 19, state.lencode, 0, state.work, opts);
       state.lenbits = opts.bits;
 
@@ -1556,7 +1556,7 @@ function inflate(strm, flush) {
          concerning the ENOUGH constants, which depend on those values */
       state.lenbits = 9;
 
-      opts = {bits: state.lenbits};
+      opts.bits = state.lenbits;
       ret = inflate_table(LENS, state.lens, 0, state.nlen, state.lencode, 0, state.work, opts);
       // We have separate tables & no pointers. 2 commented lines below not needed.
       // state.next_index = opts.table_index;
@@ -1573,7 +1573,7 @@ function inflate(strm, flush) {
       //state.distcode.copy(state.codes);
       // Switch to use dynamic table
       state.distcode = state.distdyn;
-      opts = {bits: state.distbits};
+      opts.bits = state.distbits;
       ret = inflate_table(DISTS, state.lens, state.nlen, state.ndist, state.distcode, 0, state.work, opts);
       // We have separate tables & no pointers. 2 commented lines below not needed.
       // state.next_index = opts.table_index;