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Bug 670466 - Expose image encoder options to canvas.toDataURL. r=smaug

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This commit is contained in:
Brian R. Bondy 2011-08-25 16:09:05 -04:00
parent 3a52e88b16
commit ffa35eef1b
1 changed files with 26 additions and 0 deletions
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26
content/html/content/src/nsHTMLCanvasElement.cpp
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@ -313,9 +313,35 @@ nsHTMLCanvasElement::ToDataURLImpl(const nsAString& aMimeType,
}
}
// If we haven't parsed the params check for proprietary options.
// The proprietary option -moz-parse-options will take a image lib encoder
// parse options string as is and pass it to the encoder.
PRBool usingCustomParseOptions = PR_FALSE;
if (params.Length() == 0) {
NS_NAMED_LITERAL_STRING(mozParseOptions, "-moz-parse-options:");
nsAutoString paramString;
if (NS_SUCCEEDED(aEncoderOptions->GetAsAString(paramString)) &&
StringBeginsWith(paramString, mozParseOptions)) {
nsDependentSubstring parseOptions = Substring(paramString,
mozParseOptions.Length(),
paramString.Length() -
mozParseOptions.Length());
params.Append(parseOptions);
usingCustomParseOptions = PR_TRUE;
}
}
nsCOMPtr<nsIInputStream> stream;
nsresult rv = ExtractData(type, params, getter_AddRefs(stream),
fallbackToPNG);
// If there are unrecognized custom parse options, we should fall back to
// the default values for the encoder without any options at all.
if (rv == NS_ERROR_INVALID_ARG && usingCustomParseOptions) {
fallbackToPNG = false;
rv = ExtractData(type, EmptyString(), getter_AddRefs(stream), fallbackToPNG);
}
NS_ENSURE_SUCCESS(rv, rv);
// build data URL string