mirror of
https://github.com/danbulant/pngjs
synced 2026-06-14 12:01:09 +00:00
2c37ebcbf2
* Add support for writing 16 bit channels * Fix for quick exit from the bitpacker * Add example and describe bitDepth option in README
51 lines
No EOL
1.1 KiB
JavaScript
51 lines
No EOL
1.1 KiB
JavaScript
#!/usr/bin/env node
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var fs = require('fs');
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var PNG = require("../lib/png").PNG;
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var w = 32;
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var h = 64;
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/// RGBA input (color type 6)
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var buffer = new Buffer(2 * w * h * 4);
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var bitmap = new Uint16Array(buffer.buffer);
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for (var i = 0; i < h; i++) {
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for (var j = 0; j < w; j++) {
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bitmap[i * 4 * w + 4*j] = i * 65535 / h;
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bitmap[i * 4 * w + 4*j + 1] = j * 65535 / w;
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bitmap[i * 4 * w + 4*j + 2] = (h-i) * 65535 / h;
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bitmap[i * 4 * w + 4*j + 3] = 65535;
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}
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}
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var png = new PNG({
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width: w,
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height:h,
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bitDepth: 16,
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colorType: 6,
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inputColorType: 6,
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inputHasAlpha: true
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});
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png.data = buffer;
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png.pack().pipe(fs.createWriteStream('colortype6.png'));
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//////// Grayscale 16 bits///////
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var buffer = new Buffer(2 * w * h);
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var bitmap = new Uint16Array(buffer.buffer);
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for (var i = 0; i < h; i++) {
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for (var j = 0; j < w; j++)
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bitmap[i * w + j] = i * 65535 / h;
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}
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png = new PNG({
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width: w,
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height:h,
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bitDepth: 16,
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colorType: 0,
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inputColorType: 0,
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inputHasAlpha: false
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});
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png.data = buffer;
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png.pack().pipe(fs.createWriteStream('colortype0.png')); |