Function avifEncoderWriteSampleTransformPayload

src/write.c:1089–1110

}

static avifResult avifEncoderWriteSampleTransformPayload(avifEncoder * encoder, avifRWData * data)
{
    avifRWStream s;
    avifRWStreamStart(&s, data);
    AVIF_CHECKRES(avifRWStreamWriteBits(&s, 0, /*bitCount=*/2)); // unsigned int(2) version = 0;
    AVIF_CHECKRES(avifRWStreamWriteBits(&s, 0, /*bitCount=*/4)); // unsigned int(4) reserved;
    // AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_32 is necessary because the two input images
    // once combined use 16-bit unsigned values, but intermediate results are stored in signed integers.
    AVIF_CHECKRES(avifRWStreamWriteBits(&s, AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_32, /*bitCount=*/2)); // unsigned int(2) bit_depth;

    avifSampleTransformExpression expression = { 0 };
    AVIF_CHECKRES(avifSampleTransformRecipeToExpression(encoder->sampleTransformRecipe, &expression));
    const avifResult result = avifEncoderWriteSampleTransformTokens(&s, &expression);
    avifArrayDestroy(&expression);
    if (result != AVIF_RESULT_OK) {
        avifDiagnosticsPrintf(&encoder->diag, "Failed to write sample transform metadata for recipe %d", (int)encoder->sampleTransformRecipe);
        return result;
    }

    avifRWStreamFinishWrite(&s);
    return AVIF_RESULT_OK;
}

static avifResult avifEncoderDataCreateExifItem(avifEncoderData * data, const avifRWData * exif)
{