Function ktxTexture1_IterateLoadLevelFaces

lib/texture1.c:1175–1278

* @memberof ktxTexture1 * @~English * @brief Iterate over the images in a ktxTexture1 object while loading the * image data. * * This operates similarly to @ref ktxTexture::ktxTexture_IterateLevelFaces * "ktxTexture_IterateLevelFaces" except that it loads the images from the * ktxTexture1's source to a temporary buffer while iterating. The callback * function must copy the image dat

 *                                  hold the base level image.
 */
KTX_error_code
ktxTexture1_IterateLoadLevelFaces(ktxTexture1* This, PFNKTXITERCB iterCb,
                                  void* userdata)
{
    DECLARE_PRIVATE(ktxTexture1);
    struct ktxTexture_protected* prtctd = This->_protected;
    ktxStream* stream = (ktxStream *)&prtctd->_stream;
    ktx_uint32_t    dataSize = 0;
    ktx_uint32_t    miplevel;
    KTX_error_code  result = KTX_SUCCESS;
    void*           data = NULL;

    if (This == NULL)
        return KTX_INVALID_VALUE;

    if (This->classId != ktxTexture1_c)
        return KTX_INVALID_OPERATION;

    if (iterCb == NULL)
        return KTX_INVALID_VALUE;

    if (prtctd->_stream.data.file == NULL)
        // This Texture not created from a stream or images are already loaded.
        return KTX_INVALID_OPERATION;

    for (miplevel = 0; miplevel < This->numLevels; ++miplevel)
    {
        ktx_uint32_t faceLodSize;
        ktx_uint32_t faceLodSizePadded;
        ktx_uint32_t face;
        ktx_uint32_t innerIterations;
        GLsizei      width, height, depth;

        /* Array textures have the same number of layers at each mip level. */
        width = MAX(1, This->baseWidth  >> miplevel);
        height = MAX(1, This->baseHeight >> miplevel);
        depth = MAX(1, This->baseDepth  >> miplevel);

        result = stream->read(stream, &faceLodSize, sizeof(ktx_uint32_t));
        if (result != KTX_SUCCESS) {
            goto cleanup;
        }
        if (private->_needSwap) {
            _ktxSwapEndian32(&faceLodSize, 1);
        }
#if (KTX_GL_UNPACK_ALIGNMENT != 4)
        faceLodSizePadded = _KTX_PAD4(faceLodSize);
#else
        faceLodSizePadded = faceLodSize;
#endif
        if (!data) {
            /* allocate memory sufficient for the base miplevel */
            data = malloc(faceLodSizePadded);
            if (!data) {
                result = KTX_OUT_OF_MEMORY;
                goto cleanup;
            }
            dataSize = faceLodSizePadded;