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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/image-encoders/ImageEncoderUtils.h"
#include "platform/Histogram.h"
#include "platform/network/mime/MIMETypeRegistry.h"
#include "wtf/Threading.h"
namespace blink {
const char ImageEncoderUtils::DefaultMimeType[] = "image/png";
// This enum is used in a UMA histogram; the values should not be changed.
enum RequestedImageMimeType {
RequestedImageMimeTypePng = 0,
RequestedImageMimeTypeJpeg = 1,
RequestedImageMimeTypeWebp = 2,
RequestedImageMimeTypeGif = 3,
RequestedImageMimeTypeBmp = 4,
RequestedImageMimeTypeIco = 5,
RequestedImageMimeTypeTiff = 6,
RequestedImageMimeTypeUnknown = 7,
NumberOfRequestedImageMimeTypes
};
String ImageEncoderUtils::toEncodingMimeType(const String& mimeType,
const EncodeReason encodeReason) {
String lowercaseMimeType = mimeType.lower();
if (mimeType.isNull())
lowercaseMimeType = DefaultMimeType;
RequestedImageMimeType imageFormat;
if (lowercaseMimeType == "image/png") {
imageFormat = RequestedImageMimeTypePng;
} else if (lowercaseMimeType == "image/jpeg") {
imageFormat = RequestedImageMimeTypeJpeg;
} else if (lowercaseMimeType == "image/webp") {
imageFormat = RequestedImageMimeTypeWebp;
} else if (lowercaseMimeType == "image/gif") {
imageFormat = RequestedImageMimeTypeGif;
} else if (lowercaseMimeType == "image/bmp" ||
lowercaseMimeType == "image/x-windows-bmp") {
imageFormat = RequestedImageMimeTypeBmp;
} else if (lowercaseMimeType == "image/x-icon") {
imageFormat = RequestedImageMimeTypeIco;
} else if (lowercaseMimeType == "image/tiff" ||
lowercaseMimeType == "image/x-tiff") {
imageFormat = RequestedImageMimeTypeTiff;
} else {
imageFormat = RequestedImageMimeTypeUnknown;
}
if (encodeReason == EncodeReasonToDataURL) {
DEFINE_THREAD_SAFE_STATIC_LOCAL(
EnumerationHistogram, toDataURLImageFormatHistogram,
new EnumerationHistogram("Canvas.RequestedImageMimeTypes_toDataURL",
NumberOfRequestedImageMimeTypes));
toDataURLImageFormatHistogram.count(imageFormat);
} else if (encodeReason == EncodeReasonToBlobCallback) {
DEFINE_THREAD_SAFE_STATIC_LOCAL(
EnumerationHistogram, toBlobCallbackImageFormatHistogram,
new EnumerationHistogram(
"Canvas.RequestedImageMimeTypes_toBlobCallback",
NumberOfRequestedImageMimeTypes));
toBlobCallbackImageFormatHistogram.count(imageFormat);
} else if (encodeReason == EncodeReasonConvertToBlobPromise) {
DEFINE_THREAD_SAFE_STATIC_LOCAL(
EnumerationHistogram, convertToBlobPromiseImageFormatHistogram,
new EnumerationHistogram(
"Canvas.RequestedImageMimeTypes_convertToBlobPromise",
NumberOfRequestedImageMimeTypes));
convertToBlobPromiseImageFormatHistogram.count(imageFormat);
}
// FIXME: Make isSupportedImageMIMETypeForEncoding threadsafe (to allow this
// method to be used on a worker thread).
if (!MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(lowercaseMimeType))
lowercaseMimeType = DefaultMimeType;
return lowercaseMimeType;
}
} // namespace blink
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