YiImageDecoder.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_IMAGE_DECODER_H_
#define _YI_IMAGE_DECODER_H_

#include "asset/YiImageAssetLoadParams.h"
#include "utility/YiString.h"

class CYIBitmap;

typedef struct _YI_DECODER_BITMAP_PARAMS
{
    _YI_DECODER_BITMAP_PARAMS() :
        nWidth(-1),
        nHeight(-1),
        nTargetDepth(32),
        pDestBitmap(nullptr),
        bPremultiplyAlpha(true),
        eLoadColorMode(CYIImageAssetLoadParams::LOAD_COLOR_MODE_DEFAULT)
    {}

    int32_t nWidth;
    int32_t nHeight;
    int32_t nTargetDepth;
    CYIBitmap *pDestBitmap;
    bool bPremultiplyAlpha;
    CYIImageAssetLoadParams::LOAD_COLOR_MODE eLoadColorMode;

} YI_DECODER_BITMAP_PARAMS;

class CYIImageDecoder
{
    friend class CYIAssetDecoderImage;
public:
    CYIImageDecoder(bool bIsAnimationSupported, bool bIsPreallocatedBitmapSupported);
    virtual ~CYIImageDecoder();

    bool IsAnimationSupported();

    bool IsPreAllocatedBitmapSupported();

    virtual bool IsFormatSupported(const uint8_t *pData, uint32_t nDataSize);

    std::unique_ptr<CYIBitmap> Decode(const uint8_t *pData, uint32_t nDataSize, YI_DECODER_BITMAP_PARAMS *pParams = nullptr);

    std::unique_ptr<CYIBitmap> Decode(const CYIString &path, YI_DECODER_BITMAP_PARAMS *pParams = nullptr);

    virtual bool GetImageDimensions(const CYIString &path, uint32_t *pnWidth, uint32_t *pnHeight);

protected:
    virtual std::unique_ptr<CYIBitmap> DecodeImpl(const uint8_t *pData, uint32_t nDataSize, YI_DECODER_BITMAP_PARAMS *pParams) = 0;

    virtual std::unique_ptr<CYIBitmap> DecodeImpl(const CYIString &path, YI_DECODER_BITMAP_PARAMS *pParams) = 0;

    void SetMagicByteInformation(uint32_t uMagicByteOffset, const std::vector<const char *> &possibleSequences);

private:
    std::vector<const char *> m_magicByteSequences;
    uint32_t m_nMagicByteOffset;

    bool   m_bSupportPreallocatedBitmap;
    bool   m_bSupportAnimation;
};

#endif // _YI_IMAGE_DECODER_H_