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Merge pull request #22 from gagern/deflateFactory

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Help producing reproducible results
This commit is contained in:
Luke Page 2015-09-07 13:19:01 +01:00
commit 79409fb535
2 changed files with 3 additions and 1 deletions
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1
README.md
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@ -110,6 +110,7 @@ As input any color type is accepted (grayscale, rgb, palette, grayscale with alp
- `deflateChunkSize` - chunk size used for deflating data chunks, this should be power of 2 and must not be less than 256 and more than 32*1024 (default: 32 kB) - `deflateChunkSize` - chunk size used for deflating data chunks, this should be power of 2 and must not be less than 256 and more than 32*1024 (default: 32 kB)
- `deflateLevel` - compression level for delate (default: 9) - `deflateLevel` - compression level for delate (default: 9)
- `deflateStrategy` - compression strategy for delate (default: 3) - `deflateStrategy` - compression strategy for delate (default: 3)
- `deflateFactory` - deflate stream factory (default: `zlib.createDeflate`)
- `filterType` - png filtering method for scanlines (default: -1 => auto, accepts array of numbers 0-4) - `filterType` - png filtering method for scanlines (default: -1 => auto, accepts array of numbers 0-4)

3
lib/packer.js
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@ -17,6 +17,7 @@ var Packer = module.exports = function(options) {
options.deflateChunkSize = options.deflateChunkSize || 32 * 1024; options.deflateChunkSize = options.deflateChunkSize || 32 * 1024;
options.deflateLevel = options.deflateLevel != null ? options.deflateLevel : 9; options.deflateLevel = options.deflateLevel != null ? options.deflateLevel : 9;
options.deflateStrategy = options.deflateStrategy != null ? options.deflateStrategy : 3; options.deflateStrategy = options.deflateStrategy != null ? options.deflateStrategy : 3;
options.deflateFactory = options.deflateFactory || zlib.createDeflate;
this.readable = true; this.readable = true;
}; };
@ -37,7 +38,7 @@ Packer.prototype.pack = function(data, width, height, gamma) {
var filteredData = filter(data, width, height, this._options); var filteredData = filter(data, width, height, this._options);
// compress it // compress it
var deflate = zlib.createDeflate({ var deflate = this._options.deflateFactory({
chunkSize: this._options.deflateChunkSize, chunkSize: this._options.deflateChunkSize,
level: this._options.deflateLevel, level: this._options.deflateLevel,
strategy: this._options.deflateStrategy strategy: this._options.deflateStrategy