image_loader.h

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#ifndef ENGINE_GFX_IMAGE_LOADER_H
#define ENGINE_GFX_IMAGE_LOADER_H
 
#include <base/types.h>
 
#include <engine/image.h>
 
#include <vector>
 
class CByteBufferReader
{
    const uint8_t *m_pData;
    size_t m_Size;
    size_t m_ReadOffset = 0;
    bool m_Error = false;
 
public:
    CByteBufferReader(const uint8_t *pData, size_t Size) :
        m_pData(pData),
        m_Size(Size) {}
 
    bool Read(void *pData, size_t Size);
    bool Error() const { return m_Error; }
};
 
class CByteBufferWriter
{
    std::vector<uint8_t> m_vBuffer;
 
public:
    void Write(const void *pData, size_t Size);
    const uint8_t *Data() const { return m_vBuffer.data(); }
    size_t Size() const { return m_vBuffer.size(); }
};
 
class CImageLoader
{
public:
    CImageLoader() = delete;
 
    enum
    {
        PNGLITE_COLOR_TYPE = 1 << 0,
        PNGLITE_BIT_DEPTH = 1 << 1,
        PNGLITE_INTERLACE_TYPE = 1 << 2,
        PNGLITE_COMPRESSION_TYPE = 1 << 3,
        PNGLITE_FILTER_TYPE = 1 << 4,
    };
 
    static bool LoadPng(CByteBufferReader &Reader, const char *pContextName, CImageInfo &Image, int &PngliteIncompatible);
    static bool LoadPng(IOHANDLE File, const char *pFilename, CImageInfo &Image, int &PngliteIncompatible);
 
    static bool SavePng(CByteBufferWriter &Writer, const CImageInfo &Image);
    static bool SavePng(IOHANDLE File, const char *pFilename, const CImageInfo &Image);
};
 
#endif // ENGINE_GFX_IMAGE_LOADER_H