gecko/image/test/unit/test_encoder_png.js

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/*
* Test for PNG encoding in libpr0n
*
*/
const Ci = Components.interfaces;
const Cc = Components.classes;
var png1A = {
// A 3x3 image, rows are red, green, blue.
// RGB format, transparency defaults.
transparency : null,
frames : [
{
width : 3, height : 3,
format : Ci.imgIEncoder.INPUT_FORMAT_RGB, stride : 9,
pixels : [
255,0,0, 255,0,0, 255,0,0,
0,255,0, 0,255,0, 0,255,0,
0,0,255, 0,0,255, 0,0,255,
]
}
],
expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAIAAADZSiLoAAAAEUlEQVQImWP4z8AAQTAamQkAhpcI+DeMzFcAAAAASUVORK5CYII="
};
var png1B = {
// A 3x3 image, rows are red, green, blue.
// RGB format, transparency=none.
transparency : "none",
frames : [
{
width : 3, height : 3,
format : Ci.imgIEncoder.INPUT_FORMAT_RGB, stride : 9,
pixels : [
255,0,0, 255,0,0, 255,0,0,
0,255,0, 0,255,0, 0,255,0,
0,0,255, 0,0,255, 0,0,255,
]
}
],
expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAIAAADZSiLoAAAAEUlEQVQImWP4z8AAQTAamQkAhpcI+DeMzFcAAAAASUVORK5CYII="
};
var png2A = {
// A 3x3 image, rows are: red, green, blue. Columns are: 0%, 33%, 66% transparent.
transparency : null,
frames : [
{
width : 3, height : 3,
format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
pixels : [
255,0,0,255, 255,0,0,170, 255,0,0,85,
0,255,0,255, 0,255,0,170, 0,255,0,85,
0,0,255,255, 0,0,255,170, 0,0,255,85
]
}
],
expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAAIElEQVQImSXJMQEAMAwEIUy+yZi8DmVFFBcjycn86GgPJw4O8v9DkkEAAAAASUVORK5CYII="
};
var png2B = {
// A 3x3 image, rows are: red, green, blue. Columns are: 0%, 33%, 66% transparent,
// but transparency will be ignored.
transparency : "none",
frames : [
{
width : 3, height : 3,
format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
pixels : [
255,0,0,255, 255,0,0,170, 255,0,0,85,
0,255,0,255, 0,255,0,170, 0,255,0,85,
0,0,255,255, 0,0,255,170, 0,0,255,85
]
}
],
expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAIAAADZSiLoAAAAEUlEQVQImWP4z8AAQTAamQkAhpcI+DeMzFcAAAAASUVORK5CYII="
};
// Main test entry point.
function run_test() {
dump("Checking png1A...\n")
run_test_for(png1A);
dump("Checking png1B...\n")
run_test_for(png1B);
dump("Checking png2A...\n")
run_test_for(png2A);
dump("Checking png2B...\n")
run_test_for(png2B);
};
function run_test_for(input) {
var encoder, dataURL;
encoder = encodeImage(input);
dataURL = makeDataURL(encoder, "image/png");
do_check_eq(dataURL, input.expected);
encoder = encodeImageAsync(input);
dataURL = makeDataURLFromAsync(encoder, "image/png", input.expected);
};
function encodeImage(input) {
var encoder = Cc["@mozilla.org/image/encoder;2?type=image/png"].createInstance();
encoder.QueryInterface(Ci.imgIEncoder);
var options = "";
if (input.transparency) {
options += "transparency=" + input.transparency;
}
var frame = input.frames[0];
encoder.initFromData(frame.pixels, frame.pixels.length,
frame.width, frame.height, frame.stride,
frame.format, options);
return encoder;
}
function _encodeImageAsyncFactory(frame, options, encoder)
{
function finishEncode() {
encoder.addImageFrame(frame.pixels, frame.pixels.length,
frame.width, frame.height, frame.stride,
frame.format, options);
encoder.endImageEncode();
}
return finishEncode;
}
function encodeImageAsync(input)
{
var encoder = Cc["@mozilla.org/image/encoder;2?type=image/png"].createInstance();
encoder.QueryInterface(Ci.imgIEncoder);
var options = "";
if (input.transparency) {
options += "transparency=" + input.transparency;
}
var frame = input.frames[0];
encoder.startImageEncode(frame.width, frame.height,
frame.format, options);
do_timeout(50, _encodeImageAsyncFactory(frame, options, encoder));
return encoder;
}
function makeDataURL(encoder, mimetype) {
var rawStream = encoder.QueryInterface(Ci.nsIInputStream);
var stream = Cc["@mozilla.org/binaryinputstream;1"].createInstance();
stream.QueryInterface(Ci.nsIBinaryInputStream);
stream.setInputStream(rawStream);
var bytes = stream.readByteArray(stream.available()); // returns int[]
var base64String = toBase64(bytes);
return "data:" + mimetype + ";base64," + base64String;
}
function makeDataURLFromAsync(encoder, mimetype, expected) {
do_test_pending();
var rawStream = encoder.QueryInterface(Ci.nsIAsyncInputStream);
var currentThread = Cc["@mozilla.org/thread-manager;1"].getService().currentThread;
var bytes = [];
var binarystream = Cc["@mozilla.org/binaryinputstream;1"].createInstance();
binarystream.QueryInterface(Ci.nsIBinaryInputStream);
var asyncReader =
{
onInputStreamReady: function(stream)
{
binarystream.setInputStream(stream);
var available = 0;
try {
available = stream.available();
} catch(e) { }
if (available > 0)
{
bytes = bytes.concat(binarystream.readByteArray(available));
stream.asyncWait(this, 0, 0, currentThread);
} else {
var base64String = toBase64(bytes);
var dataURL = "data:" + mimetype + ";base64," + base64String;
do_check_eq(dataURL, expected);
do_test_finished();
}
}
};
rawStream.asyncWait(asyncReader, 0, 0, currentThread);
}
/* toBase64 copied from extensions/xml-rpc/src/nsXmlRpcClient.js */
/* Convert data (an array of integers) to a Base64 string. */
const toBase64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' +
'0123456789+/';
const base64Pad = '=';
function toBase64(data) {
var result = '';
var length = data.length;
var i;
// Convert every three bytes to 4 ascii characters.
for (i = 0; i < (length - 2); i += 3) {
result += toBase64Table[data[i] >> 2];
result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
result += toBase64Table[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)];
result += toBase64Table[data[i+2] & 0x3f];
}
// Convert the remaining 1 or 2 bytes, pad out to 4 characters.
if (length%3) {
i = length - (length%3);
result += toBase64Table[data[i] >> 2];
if ((length%3) == 2) {
result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
result += toBase64Table[(data[i+1] & 0x0f) << 2];
result += base64Pad;
} else {
result += toBase64Table[(data[i] & 0x03) << 4];
result += base64Pad + base64Pad;
}
}
return result;
}