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enable per frame delay #9

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enable per frame delay #9

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f63da01
add delay per frame
xumi Dec 16, 2020
c733b70
Update README.md
xumi Dec 16, 2020
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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ const encoder = new GIFEncoder(720, 480, 'neuquant', true, 20)
| Method | Parameter | Description | Notes |
| :------------------: | :--------------: | :-------------------------------------: | :--------------------------------------------------------: |
| `start` | n/a | Starts the encoder | n/a |
| `addFrame` | `Canvas Context` | Adds a frame to the GIF | n/a |
| `addFrame` | `Canvas Context`, _delay_ | Adds a frame to the GIF | `delay` (milliseconds) param is optional. Fallbacks to global delay if none given |
| `setDelay` | number | Number of milliseconds to display frame | Can be set once or per frame |
| `setFramesPerSecond` | number | Number of frames per second to display | Another way to set delay |
| `setQuality` | number 1-30 | Neuquant quality | 1 is best/slowest |
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8 changes: 4 additions & 4 deletions src/GIFEncoder.js
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Expand Up @@ -98,7 +98,7 @@ class GIFEncoder extends EventEmitter {
this.readStreams = []
}

addFrame(input) {
addFrame(input, delay) {
if (input && input.getImageData) {
this.image = input.getImageData(0, 0, this.width, this.height).data
} else {
Expand All @@ -115,7 +115,7 @@ class GIFEncoder extends EventEmitter {
}
}

this.writeGraphicCtrlExt()
this.writeGraphicCtrlExt(delay)
this.writeImageDesc()
if (!this.firstFrame) {
this.writePalette()
Expand Down Expand Up @@ -322,7 +322,7 @@ class GIFEncoder extends EventEmitter {
this.out.writeByte(0)
}

writeGraphicCtrlExt() {
writeGraphicCtrlExt(delay) {
this.out.writeByte(0x21)
this.out.writeByte(0xf9)
this.out.writeByte(4)
Expand All @@ -343,7 +343,7 @@ class GIFEncoder extends EventEmitter {

this.out.writeByte(0 | disp | 0 | transp)

this.writeShort(this.delay)
this.writeShort(!isNaN(delay) ? delay : this.delay)
this.out.writeByte(this.transIndex)
this.out.writeByte(0)
}
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