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Add rotation to per-frame adjustments #29

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Add rotation to per-frame adjustments #29

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14 changes: 12 additions & 2 deletions libgif.js
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Original file line number Diff line number Diff line change
Expand Up @@ -453,7 +453,7 @@
var ctx_scaled = false;

var frames = [];
var frameOffsets = []; // elements have .x and .y properties
var frameOffsets = []; // elements have .x, .y, and .r properties

var gif = options.gif;
if (typeof options.auto_play == 'undefined')
Expand Down Expand Up @@ -515,6 +515,9 @@
if (typeof offset.y !== 'undefined') {
frameOffsets[frame].y = offset.y;
}
if (typeof offset.r !== 'undefined') {
frameOffsets[frame].r = offset.r;
}
};

var doShowProgress = function (pos, length, draw) {
Expand Down Expand Up @@ -605,7 +608,7 @@
data: frame.getImageData(0, 0, hdr.width, hdr.height),
delay: delay
});
frameOffsets.push({ x: 0, y: 0 });
frameOffsets.push({ x: 0, y: 0, r: 0 });
};

var doImg = function (img) {
Expand Down Expand Up @@ -764,7 +767,14 @@

tmpCanvas.getContext("2d").putImageData(frames[i].data, offset.x, offset.y);
ctx.globalCompositeOperation = "copy";
if (offset.r) {
ctx.save();
ctx.rotate(offset.r * Math.PI / 180);
}
ctx.drawImage(tmpCanvas, 0, 0);
if (offset.r) {
ctx.restore();
}
};

var play = function () {
Expand Down