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index.js
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index.js
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"use strict";
var image = require('./lib/image');
var picha = require('./build/Release/picha.node');
var Image = exports.Image = image.Image;
var catalog = exports.catalog = picha.catalog;
var mimetypes = Object.keys(catalog);
//--
var resize = exports.resize = function(src, opt, cb) {
picha.resize(src, opt, function(err, dst) {
return cb(err, dst && new Image(dst));
});
};
var resizeSync = exports.resizeSync = function(img, opt) {
return new Image(picha.resizeSync(img, opt));
};
//--
var colorConvert = exports.colorConvert = function(src, opt, cb) {
picha.colorConvert(src, opt, function(err, dst) {
return cb(err, dst && new Image(dst));
});
};
var colorConvertSync = exports.colorConvertSync = function(img, opt) {
return new Image(picha.colorConvertSync(img, opt));
};
//--
var supportedMap = {
'rgb': [ 'rgba', 'r16g16b16', 'r16g16b16a16', 'grey', 'greya', 'r16' ],
'rgba': [ 'r16g16b16a16', 'rgb', 'r16g16b16', 'greya', 'r16g16', 'grey' ],
'grey': [ 'greya', 'r16', 'rgb', 'rgba', 'r16g16', 'r16g16b16' ],
'greya': [ 'r16g16', 'rgba', 'r16g16b16a16', 'grey', 'r16', 'rgb' ],
'r16': [ 'r16g16', 'r16g16b16', 'r16g16b16a16', 'grey', 'greya', 'rgb' ],
'r16g16': [ 'r16g16b16', 'r16g16b16a16', 'greya', 'r16', 'grey', 'rgb' ],
'r16g16b16': [ 'r16g16b16a16', 'rgb', 'rgba', 'grey', 'greya', 'r16' ],
'r16g16b16a16': [ 'rgba', 'r16g16b16', 'rgb', 'greya', 'r16g16', 'r16' ],
};
function isSupported(pixel, encodes) {
return encodes.indexOf(pixel != -1);
}
function chooseSupported(pixel, encodes) {
var map = supportedMap[pixel];
if (!map) throw new Error("invalid pixel format: ", pixel);
for (var i = 0; i < map.length; ++i) {
if (isSupported(map[i], encodes))
return map[i];
}
return encodes[0];
}
function toSupported(image, encodes, next) {
if (isSupported(image.pixel, encodes))
return next(null, image);
return colorConvert(image, { pixel: chooseSupported(image.pixel, encodes) }, next);
}
function toSupportedSync(image, encodes) {
if (isSupported(image.pixel, encodes))
return image;
return colorConvertSync(image, { pixel: chooseSupported(image.pixel, encodes) });
}
//--
if (catalog['image/png']) {
var statPng = exports.statPng = picha.statPng;
var pngEncodes = exports.pngEncodes = catalog['image/png'].encodes;
var decodePng = exports.decodePng = function(buf, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
picha.decodePng(buf, opt, function(err, img) {
cb(err, img && new Image(img));
});
};
var decodePngSync = exports.decodePngSync = function(buf, opt) {
return new Image(picha.decodePngSync(buf, opt || {}));
};
var encodePng = exports.encodePng = function(img, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
toSupported(img, pngEncodes, function(err, img) {
if (err) return cb(err);
picha.encodePng(img, opt, cb);
});
};
var encodePngSync = exports.encodePngSync = function(img, opt) {
return picha.encodePngSync(toSupportedSync(img, pngEncodes), opt || {});
};
}
//--
if (catalog['image/jpeg']) {
var statJpeg = exports.statJpeg = picha.statJpeg;
var jpegEncodes = exports.jpegEncodes = catalog['image/jpeg'].encodes;
var decodeJpeg = exports.decodeJpeg = function(buf, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
picha.decodeJpeg(buf, opt, function(err, img) {
cb(err, img && new Image(img));
});
};
var decodeJpegSync = exports.decodeJpegSync = function(buf, opt) {
return new Image(picha.decodeJpegSync(buf, opt || {}));
};
var encodeJpeg = exports.encodeJpeg = function(img, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
toSupported(img, jpegEncodes, function(err, img) {
if (err) return cb(err);
picha.encodeJpeg(img, opt, cb);
});
};
var encodeJpegSync = exports.encodeJpegSync = function(img, opt) {
return picha.encodeJpegSync(toSupportedSync(img, jpegEncodes), opt || {});
};
}
//--
if (catalog['image/tiff']) {
var statTiff = exports.statTiff = picha.statTiff;
var tiffEncodes = exports.tiffEncodes = catalog['image/tiff'].encodes;
var decodeTiff = exports.decodeTiff = function(buf, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
picha.decodeTiff(buf, opt, function(err, img) {
cb(err, img && new Image(img));
});
};
var decodeTiffSync = exports.decodeTiffSync = function(buf, opt) {
return new Image(picha.decodeTiffSync(buf, opt || {}));
};
var encodeTiff = exports.encodeTiff = function(img, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
toSupported(img, tiffEncodes, function(err, img) {
if (err) return cb(err);
picha.encodeTiff(img, opt, cb);
});
};
var encodeTiffSync = exports.encodeTiffSync = function(img, opt) {
return picha.encodeTiffSync(toSupportedSync(img, tiffEncodes), opt || {});
};
}
//--
if (catalog['image/webp']) {
var statWebP = exports.statWebP = picha.statWebP;
var webpEncodes = exports.webpEncodes = catalog['image/webp'].encodes;
var decodeWebP = exports.decodeWebP = function(buf, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
picha.decodeWebP(buf, opt, function(err, img) {
cb(err, img && new Image(img));
});
};
var decodeWebPSync = exports.decodeWebPSync = function(buf, opt) {
return new Image(picha.decodeWebPSync(buf, opt || {}));
};
var encodeWebP = exports.encodeWebP = function(img, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
toSupported(img, webpEncodes, function(err, img) {
if (err) return cb(err);
picha.encodeWebP(img, opt, cb);
});
};
var encodeWebPSync = exports.encodeWebPSync = function(img, opt) {
return picha.encodeWebPSync(toSupportedSync(img, webpEncodes), opt || {});
};
}
//--
var stat = exports.stat = function(buf) {
for (var idx = 0; idx < mimetypes.length; ++idx) {
var stat = catalog[mimetypes[idx]].stat(buf);
if (stat) {
stat.mimetype = mimetypes[idx];
return stat;
}
}
};
var decode = exports.decode = function(buf, opt, cb) {
if (typeof opt === 'function') { cb = opt; opt = {}; }
tryNext(0);
function tryNext(idx) {
if (idx == mimetypes.length) return cb(new Error("unsupported image file"));
catalog[mimetypes[idx]].decode(buf, opt, function(err, img) {
if (!err && img) return cb(err, img && new Image(img));
tryNext(idx + 1);
});
}
};
var decodeSync = exports.decodeSync = function(buf, opt) {
for (var idx = 0; idx < mimetypes.length; ++idx) {
try {
var img = catalog[mimetypes[idx]].decodeSync(buf, opt || {});
if (img) return new Image(img);
}
catch (e) {
}
}
throw new Error("unsupported image file");
};