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Avoid expensive closePath() when it makes no visual difference

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This commit is contained in:
Andreas Hocevar
2016-08-11 13:17:05 +02:00
parent 274593feef
commit a4f69f32d7
1 changed files with 11 additions and 5 deletions
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16
src/ol/render/canvas/replay.js
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@@ -1205,6 +1205,7 @@ ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ = function(flatCo
var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
this.instructions.push(beginPathInstruction);
this.hitDetectionInstructions.push(beginPathInstruction);
var stroke = state.strokeStyle != undefined;
var i, ii;
for (i = 0, ii = ends.length; i < ii; ++i) {
var end = ends[i];
@@ -1213,10 +1214,15 @@ ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ = function(flatCo
flatCoordinates, offset, end, stride, true);
var moveToLineToInstruction =
[ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
var closePathInstruction = [ol.render.canvas.Instruction.CLOSE_PATH];
this.instructions.push(moveToLineToInstruction, closePathInstruction);
this.hitDetectionInstructions.push(moveToLineToInstruction,
closePathInstruction);
this.instructions.push(moveToLineToInstruction);
this.hitDetectionInstructions.push(moveToLineToInstruction);
if (stroke) {
// Performance optimization: only call closePath() when we have a stroke.
// Otherwise the ring is closed already (see appendFlatCoordinates above).
var closePathInstruction = [ol.render.canvas.Instruction.CLOSE_PATH];
this.instructions.push(closePathInstruction);
this.hitDetectionInstructions.push(closePathInstruction);
}
offset = end;
}
// FIXME is it quicker to fill and stroke each polygon individually,
@@ -1226,7 +1232,7 @@ ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ = function(flatCo
if (state.fillStyle !== undefined) {
this.instructions.push(fillInstruction);
}
if (state.strokeStyle !== undefined) {
if (stroke) {
goog.DEBUG && console.assert(state.lineWidth !== undefined,
'state.lineWidth should be defined');
var strokeInstruction = [ol.render.canvas.Instruction.STROKE];