safebox/guacamole-client
4
0
Fork 0
mirror of https://github.com/gyurix1968/guacamole-client.git synced 2025-10-27 23:23:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

Implement raster operations as transfer functions, rename setChannelMask to setCompositeOperation, supporting both channel masks and binary raster operations.

Browse Source
This commit is contained in:
Michael Jumper
2012-02-27 11:20:25 -08:00
parent aedc40691e
commit 7011f650c5
1 changed files with 60 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
guacamole-common-js/src/main/resources/layer.js
View File

@@ -74,6 +74,12 @@ Guacamole.Layer = function(width, height) {
var displayContext = display.getContext("2d");
displayContext.save();
/**
* The function to apply when drawing arbitrary source pixels over
* destination pixels.
*/
var transferFunction = null;
/**
* The queue of all pending Tasks. Tasks will be run in order, with new
* tasks added at the end of the queue and old tasks removed from the
@@ -106,6 +112,36 @@ Guacamole.Layer = function(width, height) {
0xF: "lighter"
};
/**
* Map of all Guacamole binary raster operations to transfer functions.
* @private
*/
var binaryCompositeTransferFunction = {
0x10: function (src, dst) { return 0x00; }, /* BLACK */
0x1F: function (src, dst) { return 0xFF; }, /* WHITE */
0x13: function (src, dst) { return src; }, /* SRC */
0x15: function (src, dst) { return dst; }, /* DEST */
0x1C: function (src, dst) { return ~src; }, /* NSRC */
0x1A: function (src, dst) { return ~dst; }, /* NDEST */
0x11: function (src, dst) { return src & dst; }, /* AND */
0x1E: function (src, dst) { return ~(src & dst); }, /* NAND */
0x17: function (src, dst) { return src | dst; }, /* OR */
0x18: function (src, dst) { return ~(src | dst); }, /* NOR */
0x16: function (src, dst) { return src ^ dst; }, /* XOR */
0x19: function (src, dst) { return ~(src ^ dst); }, /* XNOR */
0x14: function (src, dst) { return ~src & dst; }, /* AND inverted source */
0x1D: function (src, dst) { return ~src | dst; }, /* OR inverted source */
0x12: function (src, dst) { return src & ~dst; }, /* AND inverted destination */
0x1B: function (src, dst) { return src | ~dst; } /* OR inverted destination */
};
/**
* Resizes the canvas element backing this Layer without testing the
* new size. This function should only be used internally.
@@ -547,19 +583,35 @@ Guacamole.Layer = function(width, height) {
};
/**
* Sets the channel mask for future operations on this Layer. The channel
* mask is a Guacamole-specific compositing operation identifier with a
* single bit representing each of four channels (in order): source image
* where destination transparent, source where destination opaque,
* Sets the composite operation for future operations on this Layer. This
* operation is either a channel mask, or the ID of a binary raster
* operation.
*
* The channel mask is a Guacamole-specific compositing operation identifier
* with a single bit representing each of four channels (in order): source
* image where destination transparent, source where destination opaque,
* destination where source transparent, and destination where source
* opaque.
*
* @param {Number} mask The channel mask for future operations on this
* Layer.
* @param {Number} operation The composite operation (channel mask or binary
* raster operation) for future operations on this
* Layer.
*/
this.setChannelMask = function(mask) {
this.setCompositeOperation = function(operation) {
scheduleTask(function() {
displayContext.globalCompositeOperation = compositeOperation[mask];
// If channel mask, set composite operation only
if (operation <= 0xF) {
displayContext.globalCompositeOperation = compositeOperation[operation];
transferFunction = null;
}
// Otherwise, set binary raster operation
else {
displayContext.globalCompositeOperation = "source-over";
transferFunction = binaryCompositeTransferFunction[operation];
}
});
};