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

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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
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66
guacamole-common-js/src/main/resources/layer.js
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@@ -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
* @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];
}
});
};