Source/WebCore/platform/graphics/cg/UTIRegistry.cpp

/*
 * Copyright (C) 2017-2018 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "UTIRegistry.h"

#if USE(CG)

#include "ImageSourceCG.h"
#include "MIMETypeRegistry.h"

#include <wtf/HashSet.h>
#include <wtf/NeverDestroyed.h>
#include <ImageIO/ImageIO.h>

#if ENABLE(WEB_ARCHIVE) || ENABLE(MHTML)
#include "ArchiveFactory.h"
#endif

namespace WebCore {

const HashSet<String>& defaultSupportedImageTypes()
{
    // CG at least supports the following standard image types:
    static NeverDestroyed<HashSet<String>> defaultSupportedImageTypes = std::initializer_list<String> {
        "com.compuserve.gif",
        "com.microsoft.bmp",
        "com.microsoft.cur",
        "com.microsoft.ico",
        "public.jpeg",
        "public.jpeg-2000",
        "public.mpo-image",
        "public.png",
        "public.tiff",
    };

#ifndef NDEBUG
    // Make sure that CG supports them.
    static std::once_flag onceFlag;
    std::call_once(onceFlag, [] {
        RetainPtr<CFArrayRef> systemImageTypes = adoptCF(CGImageSourceCopyTypeIdentifiers());
        CFIndex count = CFArrayGetCount(systemImageTypes.get());
        for (auto& imageType : defaultSupportedImageTypes.get()) {
            RetainPtr<CFStringRef> string = imageType.createCFString();
            ASSERT(CFArrayContainsValue(systemImageTypes.get(), CFRangeMake(0, count), string.get()));
        }
    });
#endif

    return defaultSupportedImageTypes;
}

HashSet<String>& additionalSupportedImageTypes()
{
    static NeverDestroyed<HashSet<String>> additionalSupportedImageTypes;
    return additionalSupportedImageTypes;
}

void setAdditionalSupportedImageTypes(const Vector<String>& imageTypes)
{
    MIMETypeRegistry::additionalSupportedImageMIMETypes().clear();
    for (const auto& imageType : imageTypes) {
        additionalSupportedImageTypes().add(imageType);
        auto mimeType = MIMETypeForImageType(imageType);
        if (!mimeType.isEmpty())
            MIMETypeRegistry::additionalSupportedImageMIMETypes().add(mimeType);
    }
}

void setAdditionalSupportedImageTypesForTesting(const String& imageTypes)
{
    setAdditionalSupportedImageTypes(imageTypes.split(';'));
}

bool isSupportedImageType(const String& imageType)
{
    if (imageType.isEmpty())
        return false;
    return defaultSupportedImageTypes().contains(imageType) || additionalSupportedImageTypes().contains(imageType);
}

}

#endif