GitHub/noVNC
1
0
Fork 0
mirror of https://github.com/novnc/noVNC.git synced 2026-05-27 07:29:41 +00:00
Code Issues Packages Projects Releases Wiki Activity

Use double buffering for the display

Browse Source 
Do all rendering to a hidden canvas and then copy over the finished
frame to the visible canvas once everything is done. This simplifies
things and solves some bugs as we can retain a copy of the entire
frame buffer.
This commit is contained in:
Pierre Ossman
2016-10-25 16:58:21 +02:00
parent 18d21e3621
commit 2ba767a7fe
4 changed files with 143 additions and 287 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
core/rfb.js
View File

@@ -1042,7 +1042,7 @@
RFB.messages.pixelFormat(this._sock, this._fb_Bpp, this._fb_depth, this._true_color);
RFB.messages.clientEncodings(this._sock, this._encodings, this._local_cursor, this._true_color);
RFB.messages.fbUpdateRequests(this._sock, false, this._display.getCleanDirtyReset(), this._fb_width, this._fb_height);
RFB.messages.fbUpdateRequest(this._sock, false, 0, 0, this._fb_width, this._fb_height);
this._timing.fbu_rt_start = (new Date()).getTime();
this._timing.pixels = 0;
@@ -1198,11 +1198,9 @@
switch (msg_type) {
case 0: // FramebufferUpdate
var ret = this._framebufferUpdate();
if (ret) {
RFB.messages.fbUpdateRequests(this._sock,
this._enabledContinuousUpdates,
this._display.getCleanDirtyReset(),
this._fb_width, this._fb_height);
if (ret && !this._enabledContinuousUpdates) {
RFB.messages.fbUpdateRequest(this._sock, true, 0, 0,
this._fb_width, this._fb_height);
}
return ret;
@@ -1346,6 +1344,8 @@
if (!ret) { return ret; } // need more data
}
this._display.flip();
this._onFBUComplete(this,
{'x': this._FBU.x, 'y': this._FBU.y,
'width': this._FBU.width, 'height': this._FBU.height,
@@ -1664,27 +1664,6 @@
sock.flush();
},
fbUpdateRequests: function (sock, onlyNonInc, cleanDirty, fb_width, fb_height) {
var offsetIncrement = 0;
var cb = cleanDirty.cleanBox;
var w, h;
if (!onlyNonInc && (cb.w > 0 && cb.h > 0)) {
w = typeof cb.w === "undefined" ? fb_width : cb.w;
h = typeof cb.h === "undefined" ? fb_height : cb.h;
// Request incremental for clean box
RFB.messages.fbUpdateRequest(sock, 1, cb.x, cb.y, w, h);
}
for (var i = 0; i < cleanDirty.dirtyBoxes.length; i++) {
var db = cleanDirty.dirtyBoxes[i];
// Force all (non-incremental) for dirty box
w = typeof db.w === "undefined" ? fb_width : db.w;
h = typeof db.h === "undefined" ? fb_height : db.h;
RFB.messages.fbUpdateRequest(sock, 0, db.x, db.y, w, h);
}
},
fbUpdateRequest: function (sock, incremental, x, y, w, h) {
var buff = sock._sQ;
var offset = sock._sQlen;
@@ -1693,7 +1672,7 @@
if (typeof(y) === "undefined") { y = 0; }
buff[offset] = 3; // msg-type
buff[offset + 1] = incremental;
buff[offset + 1] = incremental ? 1 : 0;
buff[offset + 2] = (x >> 8) & 0xFF;
buff[offset + 3] = x & 0xFF;