Method initWithPVRv3Data

core/platform/Image.cpp:1715–1973

}

bool Image::initWithPVRv3Data(uint8_t* data, ssize_t dataLen, bool ownData)
{
    if (static_cast<size_t>(dataLen) < sizeof(PVRv3TexHeader))
    {
        return false;
    }

    const PVRv3TexHeader* header = static_cast<const PVRv3TexHeader*>(static_cast<const void*>(data));

    // validate version
    if (AX_SWAP_INT32_BIG_TO_HOST(header->version) != 0x50565203)
    {
        AXLOGW("axmol: WARNING: pvr file version mismatch");
        return false;
    }

    // parse pixel format
    PVR3TexturePixelFormat pixelFormat = static_cast<PVR3TexturePixelFormat>(header->pixelFormat);

    if (!testFormatForPvr3TCSupport(pixelFormat))
    {
        AXLOGW(
            "axmol:WARNING: Unsupported PVR Pixel Format: 0x{:016X}. Re-encode it with a OpenGL pixel format "
            "variant",
            static_cast<unsigned long long>(pixelFormat));
        return false;
    }

    if (v3_pixel_formathash.find(pixelFormat) == v3_pixel_formathash.end())
    {
        AXLOGW(
            "axmol:WARNING: Unsupported PVR Pixel Format: 0x{:016X}. Re-encode it with a OpenGL pixel format "
            "variant",
            static_cast<unsigned long long>(pixelFormat));
        return false;
    }

    auto finalPixelFormat = getDevicePVRPixelFormat(v3_pixel_formathash.at(pixelFormat));
    auto& info            = backend::PixelFormatUtils::getFormatDescriptor(finalPixelFormat);
    int bpp               = info.bpp;
    if (!info.bpp)
    {
        AXLOGW(
            "axmol:WARNING: Unsupported PVR Pixel Format: 0x{:016X}. Re-encode it with a OpenGL pixel format "
            "variant",
            static_cast<unsigned long long>(pixelFormat));
        return false;
    }

    _pixelFormat = finalPixelFormat;

    // flags
    int flags = AX_SWAP_INT32_LITTLE_TO_HOST(header->flags);

    // PVRv3 specifies premultiply alpha in a flag -- should always respect this in PVRv3 files
    if (flags & (unsigned int)PVR3TextureFlag::PremultipliedAlpha)
    {
        _hasPremultipliedAlpha = true;