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Refactor rect, rename copyRect -> copy, add several necessary operations, remove unused functions.

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This commit is contained in:
Michael Jumper
2012-03-11 20:16:36 -07:00
parent 4c4b2de654
commit aa1e467791
2 changed files with 159 additions and 78 deletions
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203
guacamole-common-js/src/main/resources/layer.js
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@@ -72,7 +72,6 @@ Guacamole.Layer = function(width, height) {
* @private
*/
var displayContext = display.getContext("2d");
displayContext.save();
/**
* The queue of all pending Tasks. Tasks will be run in order, with new
@@ -82,6 +81,17 @@ Guacamole.Layer = function(width, height) {
*/
var tasks = new Array();
/**
* Whether a new path should be started with the next path drawing
* operations.
*/
var pathClosed = true;
/**
* The number of states on the state stack.
*/
var stackSize = 0;
/**
* Map of all Guacamole channel masks to HTML5 canvas composite operation
* names. Not all channel mask combinations are currently implemented.
@@ -518,12 +528,12 @@ Guacamole.Layer = function(width, height) {
* @param {Number} x The destination X coordinate.
* @param {Number} y The destination Y coordinate.
*/
this.copyRect = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
this.copy = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
var drawComplete = false;
var srcLock = null;
function doCopyRect() {
function doCopy() {
if (layer.autosize != 0) fitRect(x, y, srcw, srch);
var srcCanvas = srcLayer.getCanvas();
@@ -541,13 +551,13 @@ Guacamole.Layer = function(width, height) {
// If we ARE the source layer, no need to sync.
// Syncing would result in deadlock.
if (layer === srcLayer)
scheduleTask(doCopyRect);
scheduleTask(doCopy);
// Otherwise synchronize copy operation with source layer
else {
// Currently blocked draw task
var task = scheduleTask(doCopyRect, true);
var task = scheduleTask(doCopy, true);
// Unblock draw task once source layer is ready
srcLayer.sync(task.unblock);
@@ -565,24 +575,32 @@ Guacamole.Layer = function(width, height) {
};
/**
* Clear the specified rectangle of image data.
* Add the specified cubic bezier point to the current path.
*
* @param {Number} x The X coordinate of the upper-left corner of the
* rectangle to clear.
* @param {Number} y The Y coordinate of the upper-left corner of the
* rectangle to clear.
* @param {Number} w The width of the rectangle to clear.
* @param {Number} h The height of the rectangle to clear.
* @param {Number} x The X coordinate of the point to draw.
* @param {Number} y The Y coordinate of the point to draw.
* @param {Number} cp1x The X coordinate of the first control point.
* @param {Number} cp1y The Y coordinate of the first control point.
* @param {Number} cp2x The X coordinate of the second control point.
* @param {Number} cp2y The Y coordinate of the second control point.
*/
this.clearRect = function(x, y, w, h) {
this.path = function(x, y, cp1x, cp1y, cp2x, cp2y) {
scheduleTask(function() {
if (layer.autosize != 0) fitRect(x, y, w, h);
displayContext.clearRect(x, y, w, h);
// Start a new path if current path is closed
if (pathClosed) {
displayContext.beginPath();
pathClosed = false;
}
if (layer.autosize != 0) fitRect(x, y, 0, 0);
displayContext.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, y);
});
};
/**
* Fill the specified rectangle of image data with the specified color.
* Add the specified rectangle to the current path.
*
* @param {Number} x The X coordinate of the upper-left corner of the
* rectangle to draw.
@@ -590,64 +608,141 @@ Guacamole.Layer = function(width, height) {
* rectangle to draw.
* @param {Number} w The width of the rectangle to draw.
* @param {Number} h The height of the rectangle to draw.
* @param {Number} r The red component of the color of the rectangle.
* @param {Number} g The green component of the color of the rectangle.
* @param {Number} b The blue component of the color of the rectangle.
* @param {Number} a The alpha component of the color of the rectangle.
*/
this.drawRect = function(x, y, w, h, r, g, b, a) {
this.rect = function(x, y, w, h) {
scheduleTask(function() {
// Start a new path if current path is closed
if (pathClosed) {
displayContext.beginPath();
pathClosed = false;
}
if (layer.autosize != 0) fitRect(x, y, w, h);
displayContext.fillStyle = "rgba("
+ r + "," + g + "," + b + "," + a / 255 + ")";
displayContext.fillRect(x, y, w, h);
displayContext.rect(x, y, w, h);
});
};
/**
* Clip all future drawing operations by the specified rectangle.
*
* @param {Number} x The X coordinate of the upper-left corner of the
* rectangle to use for the clipping region.
* @param {Number} y The Y coordinate of the upper-left corner of the
* rectangle to use for the clipping region.
* @param {Number} w The width of the rectangle to use for the clipping region.
* @param {Number} h The height of the rectangle to use for the clipping region.
* Clip all future drawing operations by the current path. The current path
* is implicitly closed. The current path can continue to be reused
* for other operations (such as fillColor()) but a new path will be started
* once a path drawing operation (path() or rect()) is used.
*/
this.clipRect = function(x, y, w, h) {
this.clip = function() {
scheduleTask(function() {
// Clear any current clipping region
displayContext.restore();
displayContext.save();
if (layer.autosize != 0) fitRect(x, y, w, h);
// Set new clipping region
displayContext.beginPath();
displayContext.rect(x, y, w, h);
displayContext.clip();
// Path now implicitly closed
pathClosed = true;
});
};
/**
* Provides the given filtering function with a writable snapshot of
* image data and the current width and height of the Layer.
* Stroke the current path with the specified color. The current path
* is implicitly closed. The current path can continue to be reused
* for other operations (such as clip()) but a new path will be started
* once a path drawing operation (path() or rect()) is used.
*
* @param {function} filter A function which accepts an array of image
* data (as returned by the canvas element's
* display context's getImageData() function),
* the width of the Layer, and the height of the
* Layer as parameters, in that order. This
* function must accomplish its filtering by
* modifying the given image data array directly.
* @param {Number} r The red component of the color to fill.
* @param {Number} g The green component of the color to fill.
* @param {Number} b The blue component of the color to fill.
* @param {Number} a The alpha component of the color to fill.
*/
this.filter = function(filter) {
this.strokeColor = function(r, g, b, a) {
scheduleTask(function() {
var imageData = displayContext.getImageData(0, 0, width, height);
filter(imageData.data, width, height);
displayContext.putImageData(imageData, 0, 0);
// Stroke with color
displayContext.strokeStyle = "rgba(" + r + "," + g + "," + b + "," + a/255.0 + ")";
displayContext.stroke();
// Path now implicitly closed
pathClosed = true;
});
};
/**
* Fills the current path with the specified color. The current path
* is implicitly closed. The current path can continue to be reused
* for other operations (such as clip()) but a new path will be started
* once a path drawing operation (path() or rect()) is used.
*
* @param {Number} r The red component of the color to fill.
* @param {Number} g The green component of the color to fill.
* @param {Number} b The blue component of the color to fill.
* @param {Number} a The alpha component of the color to fill.
*/
this.fillColor = function(r, g, b, a) {
scheduleTask(function() {
// Fill with color
displayContext.fillStyle = "rgba(" + r + "," + g + "," + b + "," + a/255.0 + ")";
displayContext.fill();
// Path now implicitly closed
pathClosed = true;
});
};
/**
* Push current layer state onto stack.
*/
this.push = function() {
scheduleTask(function() {
// Save current state onto stack
displayContext.save();
stackSize++;
});
};
/**
* Pop layer state off stack.
*/
this.pop = function() {
scheduleTask(function() {
// Restore current state from stack
if (stackSize > 0) {
displayContext.restore();
stackSize--;
}
});
};
/**
* Reset the layer, clearing the stack, the current path, and any transform
* matrix.
*/
this.reset = function() {
scheduleTask(function() {
// Clear stack
while (stackSize > 0) {
displaycontext.restore();
stackSize--;
}
// Clear transform
displayContext.setTransform(
1, 0, 0,
0, 1, 0
/*0, 0, 1*/
);
// Clear path
displayContext.beginPath();
pathClosed = false;
});
};