Function avifDecoderGenerateImageTiles

src/read.c:6018–6050

}

static avifResult avifDecoderGenerateImageTiles(avifDecoder * decoder, avifTileInfo * info, avifDecoderItem * item, avifItemCategory itemCategory)
{
    const uint32_t previousTileCount = decoder->data->tiles.count;
    if ((info->grid.rows > 0) && (info->grid.columns > 0)) {
        // The number of tiles was verified in avifDecoderItemReadAndParse().
        const uint32_t numTiles = info->grid.rows * info->grid.columns;
        uint32_t * dimgIdxToItemIdx = (uint32_t *)avifAlloc(numTiles * sizeof(uint32_t));
        AVIF_CHECKERR(dimgIdxToItemIdx != NULL, AVIF_RESULT_OUT_OF_MEMORY);
        avifResult result = avifFillDimgIdxToItemIdxArray(dimgIdxToItemIdx, numTiles, item);
        if (result == AVIF_RESULT_OK) {
            result = avifDecoderGenerateImageGridTiles(decoder, item, itemCategory, dimgIdxToItemIdx, numTiles);
        }
        avifFree(dimgIdxToItemIdx);
        AVIF_CHECKRES(result);
    } else {
        AVIF_CHECKERR(item->size != 0, AVIF_RESULT_MISSING_IMAGE_ITEM);

        const avifCodecType codecType = avifGetCodecType(item->type);
        AVIF_ASSERT_OR_RETURN(codecType != AVIF_CODEC_TYPE_UNKNOWN);
        avifTile * tile =
            avifDecoderDataCreateTile(decoder->data, codecType, item->width, item->height, avifDecoderItemOperatingPoint(item));
        AVIF_CHECKERR(tile, AVIF_RESULT_OUT_OF_MEMORY);
        AVIF_CHECKRES(avifCodecDecodeInputFillFromDecoderItem(tile->input,
                                                              item,
                                                              decoder->allowProgressive,
                                                              decoder->imageCountLimit,
                                                              decoder->io->sizeHint,
                                                              &decoder->diag));
        tile->input->itemCategory = itemCategory;
    }
    info->tileCount = decoder->data->tiles.count - previousTileCount;
    return AVIF_RESULT_OK;
}

// Populates depth, yuvFormat and yuvChromaSamplePosition fields on 'image' based on data from the codec config property (e.g. "av1C").
static avifResult avifReadCodecConfigProperty(avifImage * image, const avifPropertyArray * properties, avifCodecType codecType)