public/web/WebImageDecoder.h

/*
 * Copyright (C) 2010 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WebImageDecoder_h
#define WebImageDecoder_h

#include "../platform/WebCommon.h"
#include "../platform/WebImage.h"
#include "../platform/WebNonCopyable.h"

namespace WebCore { class ImageDecoder; }

namespace blink {

typedef WebCore::ImageDecoder WebImageDecoderPrivate;
class WebData;

class WebImageDecoder : public WebNonCopyable {
public:
    enum Type {
        TypeBMP,
        TypeICO
    };

    ~WebImageDecoder() { reset(); }

    explicit WebImageDecoder(Type type) { init(type); }

    // Sets data contents for underlying decoder. All the API methods
    // require that setData() is called prior to their use.
    BLINK_EXPORT void setData(const WebData& data, bool allDataReceived);

    // Deletes owned decoder.
    BLINK_EXPORT void reset();

    // Returns true if image decoding failed.
    BLINK_EXPORT bool isFailed() const;

    // Returns true if size information is available for the decoder.
    BLINK_EXPORT bool isSizeAvailable() const;

    // Returns the size of the image.
    BLINK_EXPORT WebSize size() const;

    // Gives frame count for the image. For multiple frames, decoder scans the image data for the count.
    BLINK_EXPORT size_t frameCount() const;

    // Returns if the frame at given index is completely decoded.
    BLINK_EXPORT bool isFrameCompleteAtIndex(int index) const;

    // Creates and returns WebImage from buffer at the index.
    BLINK_EXPORT WebImage getFrameAtIndex(int index) const;

private:
    // Creates type-specific decoder.
    BLINK_EXPORT void init(Type type);

    WebImageDecoderPrivate* m_private;
};

} // namespace blink

#endif